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diff --git a/FixedOrderGen/include/PhaseSpacePoint.hh b/FixedOrderGen/include/PhaseSpacePoint.hh
index d579a56..a090e92 100644
--- a/FixedOrderGen/include/PhaseSpacePoint.hh
+++ b/FixedOrderGen/include/PhaseSpacePoint.hh
@@ -1,149 +1,149 @@
/** \file PhaseSpacePoint.hh
* \brief Contains the PhaseSpacePoint Class
*/
#pragma once
#include <vector>
#include "fastjet/JetDefinition.hh"
#include "RHEJ/utility.hh"
#include "RHEJ/Event.hh"
#include "RHEJ/PDG_codes.hh"
#include "RHEJ/PDF.hh"
#include "RHEJ/RNG.hh"
#include "Status.hh"
#include "HiggsProperties.hh"
namespace HEJFOG{
class Process;
- using RHEJ::Sparticle;
+ using RHEJ::Particle;
//! A point in resummation phase space
class PhaseSpacePoint{
public:
//! Default PhaseSpacePoint Constructor
PhaseSpacePoint() = default;
//! PhaseSpacePoint Constructor
/**
* @param proc The process to generate
* @param jet_def The Jet Definition Used
* @param jetptmin Minimum Jet Transverse Momentum
* @param rapmax Maximum parton rapidity
* @param pdf The pdf set (used for sampling)
* @param uno_chance Chance to turn a potentially unordered
* emission into an actual one
*
* Initially, only FKL phase space points are generated. If the most
* extremal emission in any direction is a quark or anti-quark and the
* next emission is a gluon, uno_chance is the chance to turn this into
* an unordered emission event by swapping the two flavours. At most one
* unordered emission will be generated in this way.
*/
PhaseSpacePoint(
Process const & proc,
fastjet::JetDefinition jet_def,double jetptmin, double rapmax,
RHEJ::PDF & pdf, double E_beam,
double uno_chance,
HiggsProperties const & higgs_properties,
RHEJ::RNG & ran
);
//! Get Weight Function
/**
* @returns Weight of Event
*/
double weight() const{
return weight_;
}
Status status() const{
return status_;
}
//! Get Incoming Function
/**
* @returns Incoming Particles
*/
- std::array<Sparticle, 2> const & incoming() const{
+ std::array<Particle, 2> const & incoming() const{
return incoming_;
}
//! Get Outgoing Function
/**
* @returns Outgoing Particles
*/
- std::vector<Sparticle> const & outgoing() const{
+ std::vector<Particle> const & outgoing() const{
return outgoing_;
}
- std::unordered_map<int, std::vector<Sparticle>> const & decays() const{
+ std::unordered_map<int, std::vector<Particle>> const & decays() const{
return decays_;
}
private:
std::vector<fastjet::PseudoJet> gen_LO_partons(
int count, double ptmin, double ptmax, double rapmax,
RHEJ::RNG & ran
);
- Sparticle gen_boson(
+ Particle gen_boson(
RHEJ::ParticleID bosonid, double mass, double width,
RHEJ::RNG & ran
);
bool jets_ok(
std::vector<fastjet::PseudoJet> const & Born_jets,
std::vector<fastjet::PseudoJet> const & partons
) const;
void reconstruct_incoming(
std::array<RHEJ::ParticleID, 2> const & ids,
RHEJ::PDF & pdf, double E_beam,
RHEJ::RNG & ran
);
RHEJ::ParticleID generate_incoming_id(
double x, double uf, RHEJ::PDF & pdf,
RHEJ::RNG & ran
);
bool momentum_conserved(double ep) const;
- RHEJ::Sparticle const & most_backward_FKL(
- std::vector<RHEJ::Sparticle> const & partons
+ RHEJ::Particle const & most_backward_FKL(
+ std::vector<RHEJ::Particle> const & partons
) const;
- RHEJ::Sparticle const & most_forward_FKL(
- std::vector<RHEJ::Sparticle> const & partons
+ RHEJ::Particle const & most_forward_FKL(
+ std::vector<RHEJ::Particle> const & partons
) const;
- RHEJ::Sparticle & most_backward_FKL(std::vector<RHEJ::Sparticle> & partons) const;
- RHEJ::Sparticle & most_forward_FKL(std::vector<RHEJ::Sparticle> & partons) const;
+ RHEJ::Particle & most_backward_FKL(std::vector<RHEJ::Particle> & partons) const;
+ RHEJ::Particle & most_forward_FKL(std::vector<RHEJ::Particle> & partons) const;
bool extremal_FKL_ok(
std::vector<fastjet::PseudoJet> const & partons
) const;
double random_normal(double stddev, RHEJ::RNG & ran);
void maybe_turn_to_uno(double chance, RHEJ::RNG & ran);
- std::vector<Sparticle> decay_boson(
- RHEJ::Sparticle const & parent,
+ std::vector<Particle> decay_boson(
+ RHEJ::Particle const & parent,
std::vector<Decay> const & decays,
RHEJ::RNG & ran
);
Decay select_decay_channel(
std::vector<Decay> const & decays,
RHEJ::RNG & ran
);
double weight_;
Status status_;
double jetptmin_;
fastjet::JetDefinition jet_def_;
- std::array<Sparticle, 2> incoming_;
- std::vector<Sparticle> outgoing_;
+ std::array<Particle, 2> incoming_;
+ std::vector<Particle> outgoing_;
//! Particle decays in the format {outgoing index, decay products}
- std::unordered_map<int, std::vector<Sparticle>> decays_;
+ std::unordered_map<int, std::vector<Particle>> decays_;
};
RHEJ::UnclusteredEvent to_UnclusteredEvent(PhaseSpacePoint const & psp);
}
diff --git a/FixedOrderGen/src/PhaseSpacePoint.cc b/FixedOrderGen/src/PhaseSpacePoint.cc
index ad19a47..6080e6b 100644
--- a/FixedOrderGen/src/PhaseSpacePoint.cc
+++ b/FixedOrderGen/src/PhaseSpacePoint.cc
@@ -1,420 +1,420 @@
#include "PhaseSpacePoint.hh"
#include <random>
#include "RHEJ/kinematics.hh"
#include "RHEJ/utility.hh"
#include "RHEJ/debug.hh"
#include "RHEJ/exceptions.hh"
#include "Process.hh"
#include <CLHEP/Random/Randomize.h>
#include <CLHEP/Random/RanluxEngine.h>
using namespace RHEJ;
namespace HEJFOG{
static_assert(
std::numeric_limits<double>::has_quiet_NaN,
"no quiet NaN for double"
);
constexpr double NaN = std::numeric_limits<double>::quiet_NaN();
RHEJ::UnclusteredEvent to_UnclusteredEvent(PhaseSpacePoint const & psp){
RHEJ::UnclusteredEvent result;
result.incoming = psp.incoming();
std::sort(
begin(result.incoming), end(result.incoming),
- [](Sparticle o1, Sparticle o2){return o1.p.pz()<o2.p.pz();}
+ [](Particle o1, Particle o2){return o1.p.pz()<o2.p.pz();}
);
assert(result.incoming.size() == 2);
result.outgoing = psp.outgoing();
assert(
std::is_sorted(
begin(result.outgoing), end(result.outgoing),
RHEJ::rapidity_less{}
)
);
assert(result.outgoing.size() >= 2);
result.decays = psp.decays();
result.central.mur = NaN;
result.central.muf = NaN;
result.central.weight = psp.weight();
return result;
}
namespace{
bool can_swap_to_uno(
- RHEJ::Sparticle const & p1, RHEJ::Sparticle const & p2
+ RHEJ::Particle const & p1, RHEJ::Particle const & p2
){
return is_parton(p1)
&& p1.type != RHEJ::pid::gluon
&& p2.type == RHEJ::pid::gluon;
}
}
void PhaseSpacePoint::maybe_turn_to_uno(
double chance,
RHEJ::RNG & ran
){
assert(outgoing_.size() >= 2);
const size_t nout = outgoing_.size();
const bool can_be_uno_backward = can_swap_to_uno(
outgoing_[0], outgoing_[1]
);
const bool can_be_uno_forward = can_swap_to_uno(
outgoing_[nout-1], outgoing_[nout-2]
);
if(!can_be_uno_backward && !can_be_uno_forward) return;
if(ran.flat() < chance){
weight_ /= chance;
if(can_be_uno_backward && can_be_uno_forward){
if(ran.flat() < 0.5){
std::swap(outgoing_[0].type, outgoing_[1].type);
}
else{
std::swap(outgoing_[nout-1].type, outgoing_[nout-2].type);
}
weight_ *= 2.;
}
else if(can_be_uno_backward){
std::swap(outgoing_[0].type, outgoing_[1].type);
}
else{
assert(can_be_uno_forward);
std::swap(outgoing_[nout-1].type, outgoing_[nout-2].type);
}
}
else weight_ /= 1 - chance;
}
PhaseSpacePoint::PhaseSpacePoint(
Process const & proc,
fastjet::JetDefinition jet_def,double jetptmin, double rapmax,
RHEJ::PDF & pdf, double E_beam,
double uno_chance,
HiggsProperties const & h,
RHEJ::RNG & ran
):
jetptmin_{jetptmin},
jet_def_{jet_def}
{
assert(proc.njets >= 2);
const int nout = proc.njets + (proc.boson?1:0);
status_ = good;
weight_ = 1;
weight_ /= std::tgamma(nout);
outgoing_.reserve(nout);
for(auto&& p_out: gen_LO_partons(proc.njets, jetptmin_, E_beam, rapmax, ran)){
- outgoing_.emplace_back(Sparticle{pid::gluon, std::move(p_out)});
+ outgoing_.emplace_back(Particle{pid::gluon, std::move(p_out)});
}
if(status_ != good) return;
if(proc.boson && *proc.boson == pid::Higgs){
// The Higgs
auto Hparticle=gen_boson(pid::higgs, h.mass, h.width, ran);
auto pos=std::upper_bound(
begin(outgoing_),end(outgoing_),Hparticle,rapidity_less{}
);
outgoing_.insert(pos, Hparticle);
if(! h.decays.empty()){
const int boson_idx = std::distance(begin(outgoing_), pos);
decays_.emplace(
boson_idx,
decay_boson(outgoing_[boson_idx], h.decays, ran)
);
}
}
reconstruct_incoming(proc.incoming, pdf, E_beam, ran);
if(status_ != good) return;
// set outgoing states
most_backward_FKL(outgoing_).type = incoming_[0].type;
most_forward_FKL(outgoing_).type = incoming_[1].type;
if(proc.njets > 2) maybe_turn_to_uno(uno_chance, ran);
}
std::vector<fastjet::PseudoJet> PhaseSpacePoint::gen_LO_partons(
int np , double ptmin, double ptmax, double rapmax,
RHEJ::RNG & ran
){
if (np<2) throw std::invalid_argument{"Not enough partons in gen_LO_partons"};
// heuristic parameters for pt sampling
const double ptpar = ptmin + np/5.;
const double arg_small_y = atan((ptmax - ptmin)/ptpar);
const double y_cut = 3.;
weight_ /= pow(16.*pow(M_PI,3),np-2);
std::vector<fastjet::PseudoJet> partons;
partons.reserve(np);
for(int i = 0; i < np; ++i){
const double y = -rapmax + 2*rapmax*ran.flat();
weight_ *= 2*rapmax;
const double phi = 2*M_PI*ran.flat();
weight_ *= 2.0*M_PI;
double pt;
const double r1 = ran.flat();
if(y < y_cut){
pt = ptmin + ptpar*tan(r1*arg_small_y);
const double temp = cos(r1*arg_small_y);
weight_ *= pt*ptpar*arg_small_y/(temp*temp);
}
else{
const double ptpar2 = ptpar/(1 + 5*(y-y_cut));
const double temp = 1. - std::exp((ptmin-ptmax)/ptpar2);
pt = ptmin - ptpar2*std::log(1-r1*temp);
weight_ *= pt*ptpar2*temp/(1-r1*temp);
}
partons.emplace_back(fastjet::PtYPhiM(pt, y, phi));
assert(ptmin-1e-5 <= partons[i].pt() && partons[i].pt() <= ptmax+1e-5);
}
// Need to check that at LO, the number of jets = number of partons;
fastjet::ClusterSequence cs(partons, jet_def_);
auto cluster_jets=cs.inclusive_jets(jetptmin_);
if (cluster_jets.size()!=unsigned(np)){
weight_=0.0;
status_ = not_enough_jets;
return {};
}
std::sort(begin(partons), end(partons), rapidity_less{});
return partons;
}
- Sparticle PhaseSpacePoint::gen_boson(
+ Particle PhaseSpacePoint::gen_boson(
RHEJ::ParticleID bosonid, double mass, double width,
RHEJ::RNG & ran
){
std::array<double,2> ptrans{0.,0.};
for (auto const & parton:outgoing_) {
ptrans[0]-=parton.px();
ptrans[1]-=parton.py();
}
// The Higgs:
// Generate a y Gaussian distributed around 0
const double y = random_normal(1.6, ran);
const double r1 = ran.flat();
const double sH = mass*(
mass + width*tan(M_PI/2.*r1 + (r1-1.)*atan(mass/width))
);
const double mHperp=sqrt(ptrans[0]*ptrans[0]+ptrans[1]*ptrans[1]+sH);
const double pz=mHperp*sinh(y);
const double E=mHperp*cosh(y);
- return Sparticle{bosonid,fastjet::PseudoJet{ptrans[0],ptrans[1],pz,E}};
+ return Particle{bosonid,fastjet::PseudoJet{ptrans[0],ptrans[1],pz,E}};
}
- Sparticle const & PhaseSpacePoint::most_backward_FKL(
- std::vector<Sparticle> const & partons
+ Particle const & PhaseSpacePoint::most_backward_FKL(
+ std::vector<Particle> const & partons
) const{
if(!RHEJ::is_parton(partons[0])) return partons[1];
return partons[0];
}
- Sparticle const & PhaseSpacePoint::most_forward_FKL(
- std::vector<Sparticle> const & partons
+ Particle const & PhaseSpacePoint::most_forward_FKL(
+ std::vector<Particle> const & partons
) const{
const size_t last_idx = partons.size() - 1;
if(!RHEJ::is_parton(partons[last_idx])) return partons[last_idx-1];
return partons[last_idx];
}
- Sparticle & PhaseSpacePoint::most_backward_FKL(
- std::vector<Sparticle> & partons
+ Particle & PhaseSpacePoint::most_backward_FKL(
+ std::vector<Particle> & partons
) const{
if(!RHEJ::is_parton(partons[0])) return partons[1];
return partons[0];
}
- Sparticle & PhaseSpacePoint::most_forward_FKL(
- std::vector<Sparticle> & partons
+ Particle & PhaseSpacePoint::most_forward_FKL(
+ std::vector<Particle> & partons
) const{
const size_t last_idx = partons.size() - 1;
if(!RHEJ::is_parton(partons[last_idx])) return partons[last_idx-1];
return partons[last_idx];
}
void PhaseSpacePoint::reconstruct_incoming(
std::array<RHEJ::ParticleID, 2> const & ids,
RHEJ::PDF & pdf, double E_beam,
RHEJ::RNG & ran
){
std::tie(incoming_[0].p, incoming_[1].p) = incoming_momenta(outgoing_);
// calculate xa, xb
const double sqrts=2*E_beam;
const double xa=(incoming_[0].p.e()-incoming_[0].p.pz())/sqrts;
const double xb=(incoming_[1].p.e()+incoming_[1].p.pz())/sqrts;
// abort if phase space point is outside of collider energy reach
if (xa>1. || xb>1.){
weight_=0;
status_ = too_much_energy;
return;
}
// pick pdfs
/** TODO:
* ufa, ufb don't correspond to our final scale choice.
* The reversed HEJ scale generators currently expect a full event as input,
* so fixing this is not completely trivial
*/
if(ids[0] == pid::proton || ids[0] == pid::p_bar){
const double ufa=jetptmin_;
incoming_[0].type = generate_incoming_id(xa, ufa, pdf, ran);
}
else {
incoming_[0].type = ids[0];
}
if(ids[1] == pid::proton || ids[1] == pid::p_bar){
const double ufb=jetptmin_;
incoming_[1].type = generate_incoming_id(xb, ufb, pdf, ran);
}
else {
incoming_[1].type = ids[1];
}
assert(momentum_conserved(1e-7));
}
RHEJ::ParticleID PhaseSpacePoint::generate_incoming_id(
double x, double uf, RHEJ::PDF & pdf,
RHEJ::RNG & ran
){
const double pdfg=fabs(pdf.pdfpt(0,x,uf,pid::gluon));
const double pdfu=fabs(pdf.pdfpt(0,x,uf,pid::up));
const double pdfd=fabs(pdf.pdfpt(0,x,uf,pid::down));
const double pdfux=fabs(pdf.pdfpt(0,x,uf,pid::u_bar));
const double pdfdx=fabs(pdf.pdfpt(0,x,uf,pid::d_bar));
const double pdfc=fabs(pdf.pdfpt(0,x,uf,pid::charm));
const double pdfs=fabs(pdf.pdfpt(0,x,uf,pid::strange));
const double pdfsx=fabs(pdf.pdfpt(0,x,uf,pid::s_bar));
const double pdfb=fabs(pdf.pdfpt(0,x,uf,pid::b));
const double pdftot=pdfg+4.0/9.0*(pdfu + pdfd + pdfux + pdfdx +pdfs +pdfsx + 2.0*(pdfc +pdfb ));
const double r1=pdftot*ran.flat();
double sum;
if (r1<(sum=pdfg)) {
weight_*=pdftot/pdfg;
return pid::gluon;
}
if (r1<(sum+=(4./9.)*pdfu)) {
weight_*=pdftot/((4./9.)*pdfu);
return pid::up;
}
else if (r1<(sum+=(4./9.)*pdfd)) {
weight_*=pdftot/((4./9.)*pdfd);
return pid::down;
}
else if (r1<(sum+=(4./9.)*pdfux)) {
weight_*=pdftot/((4./9.)*pdfux);
return pid::u_bar;
}
else if (r1<(sum+=(4./9.)*pdfdx)) {
weight_*=pdftot/((4./9.)*pdfdx);
return pid::d_bar;
}
else if (r1<(sum+=(4./9.)*pdfc)) {
weight_*=pdftot/((4./9.)*pdfc);
return pid::c;
}
else if (r1<(sum+=(4./9.)*pdfc)){
weight_*=pdftot/((4./9.)*pdfc);
return pid::c_bar;
}
else if (r1<(sum+=(4./9.)*pdfs)) {
weight_*=pdftot/((4./9.)*pdfs);
return pid::s;
}
else if (r1<(sum+=(4./9.)*pdfsx)) {
weight_*=pdftot/((4./9.)*pdfsx);
return pid::s_bar;
}
else if (r1<(sum+=(4./9.)*pdfb)) {
weight_*=pdftot/((4./9.)*pdfb);
return pid::b;
}
else if (r1<=(sum+=(4./9.)*pdfb)) {
weight_*=pdftot/((4./9.)*pdfb);
return pid::b_bar;
}
std::cout << "Error in choosing incoming parton: "<<x<<" "<<uf<<" "<<sum<<" "<<pdftot<<" "<<r1;
std::cout << " "<<pdfg+4./9.*(pdfu+pdfux+pdfd+pdfdx+pdfs+pdfsx+2.*(pdfc+pdfb))<<std::endl;
throw std::logic_error{"Failed to choose parton flavour"};
}
double PhaseSpacePoint::random_normal(
double stddev,
RHEJ::RNG & ran
){
const double r1 = ran.flat();
const double r2 = ran.flat();
const double lninvr1 = -log(r1);
const double result = stddev*sqrt(2.*lninvr1)*cos(2.*M_PI*r2);
weight_ *= exp(result*result/(2*stddev*stddev))*sqrt(2.*M_PI)*stddev;
return result;
}
bool PhaseSpacePoint::momentum_conserved(double ep) const{
fastjet::PseudoJet diff;
for(auto const & in: incoming()) diff += in.p;
for(auto const & out: outgoing()) diff -= out.p;
return nearby_ep(diff, fastjet::PseudoJet{}, ep);
}
Decay PhaseSpacePoint::select_decay_channel(
std::vector<Decay> const & decays,
RHEJ::RNG & ran
){
double br_total = 0.;
for(auto const & decay: decays) br_total += decay.branching_ratio;
// adjust weight
// this is given by (channel branching ratio)/(chance to pick channel)
// where (chance to pick channel) =
// (channel branching ratio)/(total branching ratio)
weight_ *= br_total;
const double r1 = br_total*ran.flat();
double br_sum = 0.;
for(auto const & decay: decays){
br_sum += decay.branching_ratio;
if(r1 < br_sum) return decay;
}
throw std::logic_error{"unreachable"};
}
- std::vector<Sparticle> PhaseSpacePoint::decay_boson(
- RHEJ::Sparticle const & parent,
+ std::vector<Particle> PhaseSpacePoint::decay_boson(
+ RHEJ::Particle const & parent,
std::vector<Decay> const & decays,
RHEJ::RNG & ran
){
const auto channel = select_decay_channel(decays, ran);
if(channel.products.size() != 2){
throw RHEJ::not_implemented{
"only decays into two particles are implemented"
};
}
- std::vector<Sparticle> decay_products(channel.products.size());
+ std::vector<Particle> decay_products(channel.products.size());
for(size_t i = 0; i < channel.products.size(); ++i){
decay_products[i].type = channel.products[i];
}
// choose polar and azimuth angle in parent rest frame
const double E = parent.m()/2;
const double theta = 2.*M_PI*ran.flat();
const double cos_phi = 2.*ran.flat()-1.;
const double sin_phi = sqrt(1. - cos_phi*cos_phi); // Know 0 < phi < pi
const double px = E*cos(theta)*sin_phi;
const double py = E*sin(theta)*sin_phi;
const double pz = E*cos_phi;
decay_products[0].p.reset(px, py, pz, E);
decay_products[1].p.reset(-px, -py, -pz, E);
for(auto & particle: decay_products) particle.p.boost(parent.p);
return decay_products;
}
}
diff --git a/FixedOrderGen/t/h_2j.cc b/FixedOrderGen/t/h_2j.cc
index 0fb5c8c..2f7d9c3 100644
--- a/FixedOrderGen/t/h_2j.cc
+++ b/FixedOrderGen/t/h_2j.cc
@@ -1,64 +1,64 @@
#ifdef NDEBUG
#undef NDEBUG
#endif
#include <algorithm>
#include <cmath>
#include <cassert>
#include <iostream>
#include "config.hh"
#include "EventGenerator.hh"
#include "RHEJ/Ranlux64.hh"
#include "RHEJ/PDF.hh"
#include "RHEJ/MatrixElement.hh"
using namespace HEJFOG;
int main(){
constexpr double invGeV2_to_pb = 389379292.;
constexpr double xs_ref = 2.0304; //calculated with "old" HEJ svn r3364
auto config = load_config("config_h_2j.yml");
RHEJ::Ranlux64 ran{};
HEJFOG::EventGenerator generator{
config.process,
config.beam,
RHEJ::ScaleGenerator{
config.scales.base,
config.scales.factors,
config.scales.max_ratio
},
config.jets,
config.pdf_id,
config.unordered_fraction,
config.Higgs_properties,
config.Higgs_coupling,
ran
};
double xs = 0., xs_err = 0.;
for (int trials = 0; trials < config.events; ++trials){
auto ev = generator.gen_event();
if(generator.status() != good) continue;
ev.central().weight *= invGeV2_to_pb;
ev.central().weight /= config.events;
const auto the_Higgs = std::find_if(
begin(ev.outgoing()), end(ev.outgoing()),
- [](RHEJ::Sparticle const & p){ return p.type == RHEJ::ParticleID::h; }
+ [](RHEJ::Particle const & p){ return p.type == RHEJ::ParticleID::h; }
);
assert(the_Higgs != end(ev.outgoing()));
if(std::abs(the_Higgs->rapidity()) > 5.) continue;
xs += ev.central().weight;
xs_err += ev.central().weight*ev.central().weight;
}
xs_err = std::sqrt(xs_err);
std::cout << xs_ref << " ~ " << xs << " +- " << xs_err << '\n';
assert(std::abs(xs - xs_ref) < 3*xs_err);
assert(xs_err < 0.01*xs);
}
diff --git a/FixedOrderGen/t/h_2j_decay.cc b/FixedOrderGen/t/h_2j_decay.cc
index 3b2180d..688c1e4 100644
--- a/FixedOrderGen/t/h_2j_decay.cc
+++ b/FixedOrderGen/t/h_2j_decay.cc
@@ -1,82 +1,82 @@
#ifdef NDEBUG
#undef NDEBUG
#endif
#include <algorithm>
#include <cmath>
#include <cassert>
#include <iostream>
#include "config.hh"
#include "EventGenerator.hh"
#include "RHEJ/Ranlux64.hh"
#include "RHEJ/PDF.hh"
#include "RHEJ/MatrixElement.hh"
#include "RHEJ/debug.hh"
using namespace HEJFOG;
bool pass_dR_cut(
std::vector<fastjet::PseudoJet> const & jets,
- std::vector<RHEJ::Sparticle> const & photons
+ std::vector<RHEJ::Particle> const & photons
){
constexpr double delta_R_min = 0.7;
for(auto const & jet: jets){
for(auto const & photon: photons){
if(jet.delta_R(photon.p) < delta_R_min) return false;
}
}
return true;
}
int main(){
constexpr double invGeV2_to_pb = 389379292.;
constexpr double xs_ref = 0.00425287; //calculated with "old" HEJ svn r3364
auto config = load_config("config_h_2j_decay.yml");
RHEJ::Ranlux64 ran{};
HEJFOG::EventGenerator generator{
config.process,
config.beam,
RHEJ::ScaleGenerator{
config.scales.base,
config.scales.factors,
config.scales.max_ratio
},
config.jets,
config.pdf_id,
config.unordered_fraction,
config.Higgs_properties,
config.Higgs_coupling,
ran
};
double xs = 0., xs_err = 0.;
for (int trials = 0; trials < config.events; ++trials){
auto ev = generator.gen_event();
if(generator.status() != good) continue;
assert(ev.decays().size() == 1);
const auto decay = begin(ev.decays());
assert(ev.outgoing().size() > static_cast<size_t>(decay->first));
const auto & the_Higgs = ev.outgoing()[decay->first];
assert(the_Higgs.type == RHEJ::pid::Higgs);
assert(decay->second.size() == 2);
auto const & gamma = decay->second;
assert(gamma[0].type == RHEJ::pid::photon);
assert(gamma[1].type == RHEJ::pid::photon);
assert(nearby_ep(gamma[0].p + gamma[1].p, the_Higgs.p, 1e-6));
if(!pass_dR_cut(ev.jets(), gamma)) continue;
ev.central().weight *= invGeV2_to_pb;
ev.central().weight /= config.events;
xs += ev.central().weight;
xs_err += ev.central().weight*ev.central().weight;
}
xs_err = std::sqrt(xs_err);
std::cout << xs_ref << " ~ " << xs << " +- " << xs_err << '\n';
assert(std::abs(xs - xs_ref) < 3*xs_err);
assert(xs_err < 0.012*xs);
}
diff --git a/FixedOrderGen/t/h_3j.cc b/FixedOrderGen/t/h_3j.cc
index c8ba972..d24d3d9 100644
--- a/FixedOrderGen/t/h_3j.cc
+++ b/FixedOrderGen/t/h_3j.cc
@@ -1,65 +1,65 @@
#ifdef NDEBUG
#undef NDEBUG
#endif
#include <algorithm>
#include <cmath>
#include <cassert>
#include <iostream>
#include "config.hh"
#include "EventGenerator.hh"
#include "RHEJ/Ranlux64.hh"
#include "RHEJ/PDF.hh"
#include "RHEJ/MatrixElement.hh"
using namespace HEJFOG;
int main(){
constexpr double invGeV2_to_pb = 389379292.;
constexpr double xs_ref = 1.0888; //calculated with "old" HEJ svn r3364
auto config = load_config("config_h_2j.yml");
config.process.njets = 3;
RHEJ::Ranlux64 ran{};
HEJFOG::EventGenerator generator{
config.process,
config.beam,
RHEJ::ScaleGenerator{
config.scales.base,
config.scales.factors,
config.scales.max_ratio
},
config.jets,
config.pdf_id,
config.unordered_fraction,
config.Higgs_properties,
config.Higgs_coupling,
ran
};
double xs = 0., xs_err = 0.;
for (int trials = 0; trials < config.events; ++trials){
auto ev = generator.gen_event();
if(generator.status() != good) continue;
ev.central().weight *= invGeV2_to_pb;
ev.central().weight /= config.events;
const auto the_Higgs = std::find_if(
begin(ev.outgoing()), end(ev.outgoing()),
- [](RHEJ::Sparticle const & p){ return p.type == RHEJ::ParticleID::h; }
+ [](RHEJ::Particle const & p){ return p.type == RHEJ::ParticleID::h; }
);
assert(the_Higgs != end(ev.outgoing()));
if(std::abs(the_Higgs->rapidity()) > 5.) continue;
xs += ev.central().weight;
xs_err += ev.central().weight*ev.central().weight;
}
xs_err = std::sqrt(xs_err);
std::cout << xs_ref << " ~ " << xs << " +- " << xs_err << '\n';
assert(std::abs(xs - xs_ref) < 3*xs_err);
assert(xs_err < 0.02*xs);
}
diff --git a/analysis-plugins/include/ROOTReader_impl.hh b/analysis-plugins/include/ROOTReader_impl.hh
index 5ac1fc6..c161d09 100644
--- a/analysis-plugins/include/ROOTReader_impl.hh
+++ b/analysis-plugins/include/ROOTReader_impl.hh
@@ -1,270 +1,270 @@
#pragma once
#include "ROOTReader.hh"
#include "TTree.h"
#include "RHEJ/kinematics.hh"
#include "RHEJ/debug.hh"
inline
-std::ostream & operator<<(std::ostream & o, RHEJ::Sparticle const & s){
+std::ostream & operator<<(std::ostream & o, RHEJ::Particle const & s){
return o << '{' << s.type << ", " << s.p << '}';
}
inline
std::ostream & operator<<(std::ostream & o, RHEJ::EventParameters const & p){
return o << '{' << p.mur << ", " << p.muf << ", " << p.weight << '}';
}
inline
std::ostream & operator<<(std::ostream & o, RHEJ::UnclusteredEvent const & ev){
o << "incoming:\n";
for(auto && p: ev.incoming) o << " " << p << '\n';
o << "outgoing:\n";
for(auto && p: ev.outgoing) o << " " << p << '\n';
o << "central parameters: ";
return o << ev.central << '\n';
if(! ev.variations.empty()){
o << "variation parameters: {" << ev.variations.front();
for(auto it = begin(ev.variations) + 1; it != end(ev.variations); ++it){
o << ", " << (*it);
}
o << "}\n";
}
return o;
}
namespace RHEJ_analyses{
using const_iterator = ROOTReader::const_iterator;
inline
ROOTReader::ROOTReader(TTree * events):
events_{events}
{
}
inline
const_iterator ROOTReader::begin() const{
const_iterator it{events_};
it.idx_ = 0;
return it;
}
inline
const_iterator ROOTReader::end() const{
const_iterator it{events_};
it.idx_ = events_->GetEntries();
return it;
}
using difference_type = EventIterator::difference_type;
using value_type = EventIterator::value_type;
using pointer = EventIterator::pointer;
using reference = EventIterator::reference;
inline
EventIterator::EventIterator(EventIterator const & other):
idx_{other.idx_},
events_{other.events_}
{
reset_branches();
}
inline
EventIterator::EventIterator(EventIterator && other):
idx_{std::move(other.idx_)},
events_{std::move(other.events_)}
{
reset_branches();
}
inline
EventIterator & EventIterator::operator=(EventIterator const & other){
idx_ = other.idx_;
events_ = other.events_;
reset_branches();
return *this;
}
inline
EventIterator & EventIterator::operator=(EventIterator && other){
idx_ = std::move(other.idx_);
events_ = std::move(other.events_);
reset_branches();
return *this;
}
inline
EventIterator::EventIterator(TTree * events):
events_{events}
{
reset_branches();
}
inline
void EventIterator::reset_branches() const{
events_->SetBranchAddress("id", &entry_.id);
events_->SetBranchAddress("nparticle", &entry_.n_out);
events_->SetBranchAddress("weight", &entry_.weight);
events_->SetBranchAddress("id1", &entry_.PDG_id_in1);
events_->SetBranchAddress("id2", &entry_.PDG_id_in2);
events_->SetBranchAddress("fac_scale", &entry_.muf);
events_->SetBranchAddress("ren_scale", &entry_.mur);
events_->SetBranchAddress("nuwgt", &entry_.n_weights);
events_->SetBranchAddress("jet_algo", &entry_.jet_algo);
events_->SetBranchAddress("R", &entry_.R);
events_->SetBranchAddress("min_jet_pt", &entry_.min_jet_pt);
}
inline
reference EventIterator::operator*() const{
// first read number of particles and weights
events_->FindBranch("nparticle")->GetEntry(idx_);
events_->FindBranch("nuwgt")->GetEntry(idx_);
entry_.px.resize(entry_.n_out);
entry_.py.resize(entry_.n_out);
entry_.pz.resize(entry_.n_out);
entry_.E.resize(entry_.n_out);
entry_.PDG_id.resize(entry_.n_out);
entry_.weights.resize(entry_.n_weights);
events_->SetBranchAddress("px", entry_.px.data());
events_->SetBranchAddress("py", entry_.py.data());
events_->SetBranchAddress("pz", entry_.pz.data());
events_->SetBranchAddress("E", entry_.E.data());
events_->SetBranchAddress("kf", entry_.PDG_id.data());
events_->SetBranchAddress("usr_wgts", entry_.weights.data());
// second read to get the whole event
events_->GetEntry(idx_);
auto ev = to_UnclusteredEvent(entry_);
fastjet::JetDefinition jet_def{
static_cast<fastjet::JetAlgorithm>(entry_.jet_algo), entry_.R
};
ev_ = Event{std::move(ev), std::move(jet_def), entry_.min_jet_pt};
return ev_;
}
inline
RHEJ::UnclusteredEvent EventIterator::to_UnclusteredEvent(
EventIterator::BranchEntry const & event_entry
) const{
RHEJ::UnclusteredEvent ev;
ev.outgoing.resize(event_entry.n_out);
for(size_t i = 0; i < (size_t) event_entry.n_out; ++i){
ev.outgoing[i].p = {
event_entry.px[i], event_entry.py[i],
event_entry.pz[i], event_entry.E[i]
};
ev.outgoing[i].type = static_cast<RHEJ::ParticleID>(event_entry.PDG_id[i]);
}
std::tie(ev.incoming[0].p, ev.incoming[1].p) =
RHEJ::incoming_momenta(ev.outgoing);
ev.incoming[0].type = static_cast<RHEJ::ParticleID>(event_entry.PDG_id_in1);
ev.incoming[1].type = static_cast<RHEJ::ParticleID>(event_entry.PDG_id_in2);
ev.central = {event_entry.mur, event_entry.muf, event_entry.weight};
ev.variations.resize(event_entry.n_weights);
for(size_t i = 0; i < (size_t) event_entry.n_weights; ++i){
ev.variations[i].weight = event_entry.weights[i];
}
return ev;
}
inline
EventIterator & EventIterator::operator++(){
++idx_;
return *this;
}
inline
EventIterator EventIterator::operator++(int){
EventIterator res = *this;
++idx_;
return res;
}
inline
EventIterator & EventIterator::operator--(){
--idx_;
return *this;
}
inline
EventIterator EventIterator::operator--(int){
EventIterator res = *this;
--idx_;
return res;
}
inline
EventIterator & EventIterator::operator+=(difference_type n){
idx_ += n;
return *this;
}
inline
EventIterator & EventIterator::operator-=(difference_type n){
idx_ -= n;
return *this;
}
inline
reference EventIterator::operator[](difference_type n) const{
return *(*this + n);
}
inline
bool operator==(EventIterator const & a, EventIterator const & b){
return a.events_==b.events_ && a.idx_==b.idx_;
}
inline
bool operator!=(EventIterator const & a, EventIterator const & b){
return !(a==b);
}
inline
bool operator<(EventIterator const & a, EventIterator const & b){
return a.idx_ < b.idx_;
}
inline
bool operator<=(EventIterator const & a, EventIterator const & b){
return a==b || a<b;
}
inline
bool operator>(EventIterator const & a, EventIterator const & b){
return !(a<=b);
}
inline
bool operator>=(EventIterator const & a, EventIterator const & b){
return !(a<b);
}
inline
EventIterator operator+(EventIterator const & a, difference_type n){
EventIterator res = a;
return res += n;
}
inline
EventIterator operator+(difference_type n, EventIterator const & a){
return a + n;
}
inline
EventIterator operator-(EventIterator const & a, difference_type n){
return a + (-n);
}
inline
difference_type operator-(
EventIterator const & a, EventIterator const & b
){
return a.idx_ - b.idx_;
}
}
diff --git a/analysis-plugins/include/StandardAnalysis_decl.hh b/analysis-plugins/include/StandardAnalysis_decl.hh
index 9c2bac6..bf62a71 100644
--- a/analysis-plugins/include/StandardAnalysis_decl.hh
+++ b/analysis-plugins/include/StandardAnalysis_decl.hh
@@ -1,146 +1,146 @@
#pragma once
#include <array>
#include <map>
#include "fastjet/JetDefinition.hh"
#include "fastjet/PseudoJet.hh"
#include "fastjet/ClusterSequence.hh"
#include "RHEJ/Analysis.hh"
#include "RHEJ/Event.hh"
#include "Histogram.hh"
class TFile;
namespace YAML{
class Node;
}
namespace RHEJ_analyses{
using RHEJ::Event;
namespace detail{
struct AbsWtLess{
bool operator()(Event const & a, Event const & b){
return std::abs(a.central().weight) < std::abs(b.central().weight);
}
};
}
class StandardAnalysis: public RHEJ::DynamicAnalysis{
public:
using histogram_type = Histogram;
// macro definition to avoid repetition of histogram names
#define RHEJ_HISTOGRAMS(F) F(total), F(np), F(njets),F(pt1), F(pt2), F(pth1), F(pth2), F(qt), F(ya), F(yb), F(ydif), F(yEW), F(ptEW), F(wt), F(wtwt)
#define RHEJ_AS_ENUM(VAR) VAR
#define RHEJ_AS_STRING(VAR) #VAR
enum Id{
RHEJ_HISTOGRAMS(RHEJ_AS_ENUM),
first_histogram = np,
last_histogram = wtwt,
first_histpack = np,
last_histpack = ptEW
};
static constexpr auto hist_names = RHEJ::make_array(
RHEJ_HISTOGRAMS(RHEJ_AS_STRING)
);
#undef RHEJ_HISTOGRAMS
#undef RHEJ_AS_ENUM
#undef RHEJ_AS_STRING
StandardAnalysis(YAML::Node const &);
explicit StandardAnalysis(std::string const & filename);
StandardAnalysis(StandardAnalysis const & other);
StandardAnalysis(StandardAnalysis && other);
StandardAnalysis & operator=(StandardAnalysis const & other);
StandardAnalysis & operator=(StandardAnalysis && other);
void fill(Event const & e, Event const &) override;
bool pass_cuts(Event const &, Event const &) override{
return true;
};
std::vector<std::string> histogram_names() const override;
std::vector<Parameter> parameters() const override;
void draw_histogram(
std::string const & name, std::string const & filename
) const override;
bool update_parameter(std::string const & name, double value) override;
void finalise() override;
static std::unique_ptr<Analysis> create(YAML::Node const &);
static std::unique_ptr<DynamicAnalysis> create(
std::string const & filename
);
private:
void store();
void restore(std::string const & filename);
void write_settings(TFile & out);
void write_histograms(TFile & out);
void write_events(TFile & out);
void read_settings(TFile & in);
void read_histograms(TFile & in);
void read_events(TFile & in);
struct hist_pack{
histogram_type h, hwt, hN;
hist_pack() = default;
hist_pack(
const char * title, const std::string & id,
int numbins, double min, double max
);
void fill(double val, double wt);
void write() const;
int nbins() const;
};
struct KinInfo{
- std::vector<RHEJ::Sparticle> out;
+ std::vector<RHEJ::Particle> out;
std::vector<fastjet::PseudoJet> jets_y;
std::vector<fastjet::PseudoJet> jets_pt;
fastjet::PseudoJet q;
};
struct EventHists{
EventHists();
explicit EventHists(std::string const & id);
void fill(KinInfo const & i, double weight);
void write() const;
std::array<hist_pack, last_histpack + 1> hist_;
histogram_type hist_wt_, hist_wtwt_;
};
void restore_histograms(
std::map<std::string, histogram_type> && hists
);
void update_hist_by_name();
void add_to_hist_by_name(EventHists const & hist);
void add_to_hist_by_name(hist_pack const & pack);
void reset();
EventHists central_;
std::vector<EventHists> hist_;
double log_wt_cut_;
std::string output_;
std::set<Event, detail::AbsWtLess> bad_events_;
using Hist_ref = std::reference_wrapper<const histogram_type>;
std::map<std::string, Hist_ref> hist_by_name_;
EventHists orig_central_;
std::vector<EventHists> orig_hist_;
double orig_log_wt_cut_;
};
}
diff --git a/analysis-plugins/include/StandardAnalysis_impl.hh b/analysis-plugins/include/StandardAnalysis_impl.hh
index 619df5b..4674ee2 100644
--- a/analysis-plugins/include/StandardAnalysis_impl.hh
+++ b/analysis-plugins/include/StandardAnalysis_impl.hh
@@ -1,525 +1,525 @@
#pragma once
#include <iostream>
#include <numeric>
#include "StandardAnalysis.hh"
#include "ROOTWriter.hh"
#include "ROOTReader.hh"
#include "TDirectory.h"
#include "TKey.h"
#include "TCanvas.h"
#include "TImage.h"
#include "TFile.h"
#include "yaml-cpp/yaml.h"
namespace RHEJ_analyses{
namespace detail{
inline
bool disable_TH1_reference(){
TH1::AddDirectory(kFALSE);
std::cout << "Disabled central ROOT histogram references\n";
return true;
};
}
using histogram = StandardAnalysis::histogram_type;
inline
StandardAnalysis::hist_pack::hist_pack(
const char * title, const std::string & id,
int numbins, double min, double max
):
h((title + id).c_str(), title, numbins, min, max),
hwt(
(title + ("wt2" + id)).c_str(),
(title + std::string("wt2")).c_str(),
numbins, min, max
),
hN(
(title + ("N" + id)).c_str(),
(title + std::string("N")).c_str(),
numbins, min, max
)
{
static const bool TH1_reference_disabled = detail::disable_TH1_reference();
(void) TH1_reference_disabled; // avoid compiler warnings
h.sumw2();
}
inline
void StandardAnalysis::hist_pack::write() const{
h.write();
hwt.write();
hN.write();
}
inline
int StandardAnalysis::hist_pack::nbins() const{
return h.nbins();
}
inline
void StandardAnalysis::hist_pack::fill(double val, double wt){
const int binnumber = h.x_axis()->FindBin(val);
const double binwidth = h.x_axis()->GetBinWidth(binnumber);
h.fill(val, wt/binwidth);
hwt.fill(val, wt*wt/binwidth);
hN.fill(val, 1);
}
inline
StandardAnalysis::EventHists::EventHists():
EventHists{""} {}
StandardAnalysis::EventHists::EventHists(std::string const & id){
#define NEWHIST(X,UUID,BINS,MIN,MAX) hist_[X] = hist_pack{#X, UUID, BINS, MIN, MAX};
NEWHIST(total,id,1,-.5,.5);
NEWHIST(np,id,35,-.5,34.5);
NEWHIST(njets,id,7,.5,7.5);
NEWHIST(pt1,id,100,0.,1000.);
NEWHIST(pt2,id,100,0.,1000.);
NEWHIST(pth1,id,100,0.,1000.);
NEWHIST(pth2,id,100,0.,1000.);
NEWHIST(qt,id,100,0.,99.);
NEWHIST(ya,id,40,-5.,5.);
NEWHIST(yb,id,40,-5.,5.);
NEWHIST(ydif,id,32,0.,8.);
NEWHIST(yEW,id,40,-5.,5.);
NEWHIST(ptEW,id,20,0.,200.);
#undef NEWHIST
hist_wt_ = histogram{("wt" + id).c_str(),"wt",800,-30.,50.};
hist_wtwt_ = histogram{("wtwt" + id).c_str(),"wtwt",800,-30.,50.};
}
inline
void StandardAnalysis::EventHists::fill(KinInfo const & i, double weight){
const double ymin = i.jets_y.front().rapidity();
const double ymax = i.jets_y.back().rapidity();
assert(ymax > ymin);
const auto EW_boson = std::find_if(
begin(i.out), end(i.out),
- [](RHEJ::Sparticle const & s){ return is_AWZH_boson(s); }
+ [](RHEJ::Particle const & s){ return is_AWZH_boson(s); }
);
const size_t npartons = (EW_boson==end(i.out))?
i.out.size():
i.out.size()-1
;
hist_[total].fill(0., weight);
hist_[np].fill(npartons, weight);
for(size_t jets = 2; jets <= i.jets_y.size(); ++jets){
hist_[njets].fill(jets, weight);
}
hist_[pt1].fill(i.jets_y.front().perp(), weight);
hist_[pt2].fill(i.jets_y.back().perp(), weight);
hist_[pth1].fill(i.jets_pt.front().perp(), weight);
hist_[pth2].fill(i.jets_pt[1].perp(), weight);
hist_[qt].fill(i.q.perp(), weight);
hist_[ya].fill(ymin, weight);
hist_[yb].fill(ymax, weight);
hist_[ydif].fill(ymax - ymin, weight);
if(EW_boson!=end(i.out)){
hist_[yEW].fill(EW_boson->rapidity(), weight);
hist_[ptEW].fill(EW_boson->perp(), weight);
}
const double awt = std::abs(weight);
hist_wt_.fill(std::log(awt), 1);
hist_wtwt_.fill(std::log(awt), awt);
}
inline
void StandardAnalysis::EventHists::write() const{
for(auto hist: hist_){
hist.write();
}
hist_wt_.write();
hist_wtwt_.write();
}
namespace detail{
inline
double get_log_wt_cut(YAML::Node const & cut){
return cut?
cut.as<double>():
std::numeric_limits<double>::infinity();
}
}
inline
StandardAnalysis::StandardAnalysis(YAML::Node const & parameters):
log_wt_cut_{detail::get_log_wt_cut(parameters["log wt cut"])},
output_{parameters["output"].as<std::string>()}
{}
inline
StandardAnalysis::StandardAnalysis(
std::string const & filename
){
restore(filename);
}
inline
void StandardAnalysis::finalise(){
if(!output_.empty()) store();
}
inline
StandardAnalysis::StandardAnalysis(StandardAnalysis const & other){
*this = other;
}
inline
StandardAnalysis::StandardAnalysis(StandardAnalysis && other){
*this = std::move(other);
}
inline
StandardAnalysis & StandardAnalysis::operator=(StandardAnalysis const & other){
if(this == &other) return *this;
central_ = other.central_;
hist_ = other.hist_;
log_wt_cut_ = other.log_wt_cut_;
output_ = other.output_;
bad_events_ = other.bad_events_;
orig_central_ = other.orig_central_;
orig_hist_ = other.orig_hist_;
orig_log_wt_cut_ = other.orig_log_wt_cut_;
update_hist_by_name();
return *this;
}
StandardAnalysis & StandardAnalysis::operator=(StandardAnalysis && other){
if(this == &other) return *this;
central_ = std::move(other.central_);
hist_ = std::move(other.hist_);
log_wt_cut_ = std::move(other.log_wt_cut_);
output_ = std::move(other.output_);
bad_events_ = std::move(other.bad_events_);
orig_central_ = std::move(other.orig_central_);
orig_hist_ = std::move(other.orig_hist_);
orig_log_wt_cut_ = std::move(other.orig_log_wt_cut_);
update_hist_by_name();
return *this;
}
inline
std::vector<std::string> StandardAnalysis::histogram_names() const{
std::vector<std::string> result;
for(auto const & entry: hist_by_name_) result.emplace_back(entry.first);
return result;
};
inline
std::vector<RHEJ::DynamicAnalysis::Parameter> StandardAnalysis::parameters() const{
double min = log_wt_cut_;
double max = log_wt_cut_;
if(! bad_events_.empty()){
min = std::min(min, std::log(std::abs(begin(bad_events_)->central().weight)));
max = std::max(max, std::log(std::abs(bad_events_.rbegin()->central().weight)));
}
return {RHEJ::DynamicAnalysis::Parameter{"log wt cut", log_wt_cut_, min, max}};
}
inline
void StandardAnalysis::draw_histogram(
std::string const & name, std::string const & filename
) const{
const auto hist = hist_by_name_.find(name);
if(hist == end(hist_by_name_)){
throw std::invalid_argument{
"histogram with title "+ name + " does not exist"
};
}
TCanvas c;
hist->second.get().draw();
const auto img = std::unique_ptr<TImage>{TImage::Create()};
img->FromPad(&c);
img->WriteImage(filename.c_str(), TImage::EImageFileTypes::kPng);
}
inline
bool StandardAnalysis::update_parameter(std::string const & name, double value){
if(name != "log wt cut"){
throw std::invalid_argument{"invalid parameter " + name};
}
Event search_event;
search_event.central().weight = std::exp(log_wt_cut_);
const auto old_end = bad_events_.lower_bound(search_event);
search_event.central().weight = std::exp(value);
const auto new_end = bad_events_.lower_bound(search_event);
if(new_end == old_end){
log_wt_cut_ = value;
return false; // no update required
}
if(value < log_wt_cut_){
// we would have to remove events from histograms
// instead, reset and add all events again
reset();
update_parameter(name, value);
return true;
}
log_wt_cut_ = value;
for(auto it = old_end; it != new_end; ++it) fill(*it, *it);
return true;
}
inline
void StandardAnalysis::fill(Event const & ev, Event const & /* FO_event */){
if(std::log(std::abs(ev.central().weight)) > log_wt_cut_){
bad_events_.emplace(ev);
return;
}
const std::vector<fastjet::PseudoJet> partons =
to_PseudoJet(filter_partons(ev.outgoing()));
auto jets_y = sorted_by_rapidity(ev.jets());
auto q =
std::accumulate(partons.begin(), partons.end(), fastjet::PseudoJet{})
- std::accumulate(jets_y.begin(), jets_y.end(), fastjet::PseudoJet{})
;
const KinInfo info = {
ev.outgoing(),
std::move(jets_y),
sorted_by_pt(ev.jets()),
std::move(q)
};
assert(info.jets_y.size() == info.jets_pt.size());
assert(info.jets_y.size() >= 2);
central_.fill(info, ev.central().weight);
if(hist_.empty()){
hist_.reserve(ev.variations().size());
for(size_t i = 0; i < ev.variations().size(); ++i){
hist_.emplace_back('_' + std::to_string(i));
}
}
if(hist_.size() != ev.variations().size()){
throw std::invalid_argument(
"number of weights " + std::to_string(ev.variations().size())
+ " does not match number of histograms "
+ std::to_string(hist_.size())
);
}
for(size_t i = 0; i < ev.variations().size(); ++i){
hist_[i].fill(info, ev.variations(i).weight);
}
}
inline
void StandardAnalysis::write_settings(TFile &){
TTree settings{"settings", "settings"};
settings.Branch("log_wt_cut", &log_wt_cut_, "wtwt_cut/D");
settings.Fill();
settings.Write();
}
inline
void StandardAnalysis::read_settings(TFile & in){
auto tree = static_cast<TTree*>(in.Get("settings"));
if(tree == nullptr){
throw std::runtime_error("no TTree with name \"settings\"");
}
tree->SetBranchAddress("log_wt_cut", &log_wt_cut_);
if(tree->GetEntries() != 1){
throw std::runtime_error("wrong number of entries in \"settings\"");
}
tree->GetEntry(0);
}
inline
void StandardAnalysis::write_histograms(TFile & out){
const auto dir = out.mkdir("histograms");
assert(dir != nullptr);
dir->cd();
central_.write();
for(auto const & hist: hist_) hist.write();
out.cd();
}
inline
void StandardAnalysis::write_events(TFile &){
ROOTWriter writer{"events"};
for(auto && event: bad_events_) writer.write(event);
}
namespace detail{
struct weight_less{
bool operator()(Event const & a, Event const & b){
return a.central().weight < b.central().weight;
}
bool operator()(Event const & ev, double wt){
return ev.central().weight < wt;
}
bool operator()(double wt, RHEJ::Event const & ev){
return wt < ev.central().weight;
}
};
}
inline
void StandardAnalysis::read_events(TFile & in){
assert(in.IsOpen());
auto event_tree = static_cast<TTree*>(in.Get("events"));
if(event_tree == nullptr){
throw std::runtime_error("no TTree with name \"events\"");
}
ROOTReader event_reader{event_tree};
bad_events_ = std::set<Event, detail::AbsWtLess>(
std::begin(event_reader), std::end(event_reader)
);
}
inline
void StandardAnalysis::store(){
TFile out{output_.c_str(), "RECREATE"};
write_settings(out);
write_histograms(out);
write_events(out);
}
inline
void StandardAnalysis::restore(std::string const & filename){
TFile in{filename.c_str()};
read_settings(in);
read_histograms(in);
read_events(in);
orig_central_ = central_;
orig_hist_ = hist_;
orig_log_wt_cut_ = log_wt_cut_;
}
namespace detail{
using histogram_type = StandardAnalysis::histogram_type;
inline
size_t num_hist_indices(
std::map<std::string, Histogram> const & hists,
std::string const & name
){
size_t result = 0;
while(hists.find(name + "_" + std::to_string(result)) != hists.end()){
++result;
}
return result;
}
inline
std::map<std::string, histogram_type> read_hist_map(TDirectory & in){
TIter keys = in.GetListOfKeys();
TKey* key;
std::map<std::string, histogram_type> hists;
while( (key = static_cast<TKey*>(keys())) ){
auto new_hist = dynamic_cast<TH1D*>(key->ReadObj());
if(! new_hist){
throw std::runtime_error("Encountered unexpected object in ROOT file");
}
hists.emplace(new_hist->GetName(), histogram_type{new_hist});
}
return hists;
}
}
inline
void StandardAnalysis::read_histograms(TFile & in){
const auto dir = in.GetDirectory("histograms");
if(dir == nullptr){
throw std::runtime_error{"no directory \"histograms\""};
}
restore_histograms(detail::read_hist_map(*dir));
update_hist_by_name();
}
inline
void StandardAnalysis::restore_histograms(
std::map<std::string, histogram_type> && hists
){
hist_.resize(detail::num_hist_indices(hists, hist_names[first_histogram]));
for(size_t id = first_histogram; id <= last_histpack; ++id){
central_.hist_[id].h = std::move(hists[hist_names[id]]);
for(size_t i = 0; i < hist_.size(); ++i){
const std::string name = hist_names[id] + ("_" + std::to_string(i));
hist_[i].hist_[id].h = std::move(hists[name]);
}
std::string name = hist_names[id] + std::string{"wt2"};
central_.hist_[id].hwt = std::move(hists[name]);
for(size_t i = 0; i < hist_.size(); ++i){
const std::string name = hist_names[id] + ("wt2_" + std::to_string(i));
hist_[i].hist_[id].hwt = std::move(hists[name]);
}
name = hist_names[id] + std::string{"N"};
central_.hist_[id].hN = std::move(hists[name]);
for(size_t i = 0; i < hist_.size(); ++i){
const std::string name = hist_names[id] + ("N_" + std::to_string(i));
hist_[i].hist_[id].hN = std::move(hists[name]);
}
}
central_.hist_wt_ = std::move(hists["wt"]);
central_.hist_wtwt_ = std::move(hists["wtwt"]);
for(size_t i = 0; i < hist_.size(); ++i){
std::string name = "wt_" + std::to_string(i);
hist_[i].hist_wt_ = std::move(hists[name]);
name = "wtwt_" + std::to_string(i);
hist_[i].hist_wtwt_ = std::move(hists[name]);
}
}
inline
void StandardAnalysis::update_hist_by_name(){
hist_by_name_.clear();
add_to_hist_by_name(central_);
for(auto const & hist: hist_) add_to_hist_by_name(hist);
}
inline
void StandardAnalysis::add_to_hist_by_name(EventHists const & hist){
for(auto const & h: hist.hist_) add_to_hist_by_name(h);
hist_by_name_.emplace(hist.hist_wt_.title(), Hist_ref{hist.hist_wt_});
hist_by_name_.emplace(hist.hist_wtwt_.title(), Hist_ref{hist.hist_wtwt_});
}
inline
void StandardAnalysis::add_to_hist_by_name(hist_pack const & pack){
hist_by_name_.emplace(pack.h.title(), Hist_ref{pack.h});
hist_by_name_.emplace(pack.hwt.title(), Hist_ref{pack.hwt});
hist_by_name_.emplace(pack.hN.title(), Hist_ref{pack.hN});
}
inline
std::unique_ptr<RHEJ::Analysis> StandardAnalysis::create(
YAML::Node const & parameters
){
return std::unique_ptr<Analysis>{new StandardAnalysis{parameters}};
}
inline
std::unique_ptr<RHEJ::DynamicAnalysis> StandardAnalysis::create(
std::string const & filename
){
return std::unique_ptr<RHEJ::DynamicAnalysis>{
new StandardAnalysis{filename}
};
}
inline
void StandardAnalysis::reset(){
central_ = orig_central_;
hist_ = orig_hist_;
log_wt_cut_ = orig_log_wt_cut_;
update_hist_by_name();
}
constexpr
decltype(StandardAnalysis::hist_names) StandardAnalysis::hist_names;
}
diff --git a/include/RHEJ/Event.hh b/include/RHEJ/Event.hh
index 77dd373..b79ab89 100644
--- a/include/RHEJ/Event.hh
+++ b/include/RHEJ/Event.hh
@@ -1,136 +1,136 @@
/** \file Event.hh
* \brief Details the parameters of an Event.
*
* Contains the EventParameters struct and the Event struct. Also
* contains the ClusteredEvent class.
*/
#pragma once
#include <string>
#include <unordered_map>
#include "RHEJ/utility.hh"
#include "RHEJ/event_types.hh"
#include "LHEF/LHEF.h"
#include "fastjet/JetDefinition.hh"
#include "fastjet/ClusterSequence.hh"
namespace RHEJ{
/** \struct EventParameters Event.hh "include/RHEJ/Event.hh"
* \brief A struct containing the parameters of an event
*/
struct EventParameters{
double mur; /**< Value of the Renormalisation Scale */
double muf; /**< Value of the Factorisation Scale */
double weight; /**< Event Weight */
};
/** \struct UnclusteredEvent Event.hh "include/RHEJ/Event.hh"
* \brief Event Struct which contains Particle Content.
*/
struct UnclusteredEvent{
//! Default Constructor
UnclusteredEvent() = default;
//! Constructor from LesHouches event information
UnclusteredEvent(LHEF::HEPEUP const & hepeup);
- std::array<Sparticle, 2> incoming; /**< Incoming Particles */
- std::vector<Sparticle> outgoing; /**< Outgoing Particles */
+ std::array<Particle, 2> incoming; /**< Incoming Particles */
+ std::vector<Particle> outgoing; /**< Outgoing Particles */
//! Particle decays in the format {outgoing index, decay products}
- std::unordered_map<int, std::vector<Sparticle>> decays;
+ std::unordered_map<int, std::vector<Particle>> decays;
//! Central parameter (e.g. scale) choice
EventParameters central;
std::vector<EventParameters> variations; /**< For parameter variation */
};
/** \class Event Event.hh "include/RHEJ/Event.hh"
* \brief Class for Events
*
* This is the default reversed HEJ event class.
* It contains kinematic information including jet clustering,
* parameter (e.g. scale) settings and the event weight.
*/
class Event{
public:
//! Default Event Constructor
Event() = default;
//! Event Constructor adding jet clustering to an unclustered event
Event(
UnclusteredEvent ev,
fastjet::JetDefinition const & jet_def, double min_jet_pt
);
std::vector<fastjet::PseudoJet> jets() const;
UnclusteredEvent const & unclustered() const {
return ev_;
}
EventParameters const & central() const{
return ev_.central;
}
EventParameters & central(){
return ev_.central;
}
- std::array<Sparticle, 2> const & incoming() const{
+ std::array<Particle, 2> const & incoming() const{
return ev_.incoming;
}
- std::vector<Sparticle> const & outgoing() const{
+ std::vector<Particle> const & outgoing() const{
return ev_.outgoing;
}
- std::unordered_map<int, std::vector<Sparticle>> const & decays() const{
+ std::unordered_map<int, std::vector<Particle>> const & decays() const{
return ev_.decays;
}
std::vector<EventParameters> const & variations() const{
return ev_.variations;
}
std::vector<EventParameters> & variations(){
return ev_.variations;
}
EventParameters const & variations(size_t i) const{
return ev_.variations[i];
}
EventParameters & variations(size_t i){
return ev_.variations[i];
}
std::vector<int> particle_jet_indices(
std::vector<fastjet::PseudoJet> const & jets
) const{
return cs_.particle_jet_indices(jets);
}
fastjet::JetDefinition const & jet_def() const{
return cs_.jet_def();
}
double min_jet_pt() const{
return min_jet_pt_;
}
event_type::EventType type() const{
return type_;
}
private:
UnclusteredEvent ev_;
fastjet::ClusterSequence cs_;
double min_jet_pt_;
event_type::EventType type_;
};
double shat(Event const & ev);
LHEF::HEPEUP to_HEPEUP(Event const & event, LHEF::HEPRUP *);
}
diff --git a/include/RHEJ/MatrixElement.hh b/include/RHEJ/MatrixElement.hh
index 20302f4..41b4f6f 100644
--- a/include/RHEJ/MatrixElement.hh
+++ b/include/RHEJ/MatrixElement.hh
@@ -1,216 +1,216 @@
/** \file MatrixElement.hh
* \brief The header file which contains the MatrixElement Class
*
* This contains the MatrixElement Class which contains many functions
* used to calculate many different MatrixElements and their components.
*/
#pragma once
#include <functional>
#include "RHEJ/config.hh"
#include "RHEJ/utility.hh"
#include "RHEJ/HiggsCouplingSettings.hh"
#include "CLHEP/Vector/LorentzVector.h"
namespace RHEJ{
/** \class MatrixElement MatrixElement.hh "include/RHEJ/MatrixElement.hh
* \brief MatrixElement class. Functions for obtaining various ME and components.
*/
class MatrixElement{
public:
/** \brief MatrixElement Constructor
* @param alpha_s Function taking the renormalisation scale
* and returning the strong coupling constant
* @param conf General matrix element settings
*/
MatrixElement(
std::function<double (double)> alpha_s,
MatrixElementConfig conf
);
/**
* \brief regulated HEJ matrix element
* @param mur Value of the renormalisation scale
* @param incoming Incoming particles
* @param partons Outgoing particles
* @param check_momenta Special treatment for partons inside extremal jets
* @returns The HEJ matrix element including virtual corrections
*
* cf. eq. (22) in \ref Andersen:2011hs
* Incoming particles should be ordered by ascending z momentum.
* Outgoing particles should be ordered by ascending rapidity.
*
* \internal Relation to standard HEJ Met2: MatrixElement = Met2*shat^2/(pdfta*pdftb)
*/
double operator()(
double mur,
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const;
//! HEJ tree-level matrix element
/**
* @param mur Value of the renormalisation scale
* @param incoming Incoming particles
* @param outgoing Outgoing particles
* @param check_momenta Special treatment for partons inside extremal jets
* @returns The HEJ matrix element without virtual corrections
*
* cf. eq. (22) in \ref Andersen:2011hs
* Incoming particles should be ordered by ascending z momentum.
* Outgoing particles should be ordered by ascending rapidity.
*/
double tree(
double mur,
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const;
//! HEJ tree-level matrix element - parametric part
/**
* @param mur Value of the renormalisation scale
* @param outgoing Outgoing particles
* @returns The parametric part of the tree matrix element
*
* cf. eq. (22) in \ref Andersen:2011hs
*
* The tree level matrix element factorises into a parametric part
* which depends on the theory parameters (alpha_s and scale)
* and a kinematic part comprising the dependence on the particle momenta
* and colour factors. This function returns the former.
*/
double tree_param(
double mur,
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing
) const;
//! HEJ tree-level matrix element - kinematic part
/**
* @param incoming Incoming particles
* @param partons Outgoing particles
* @param check_momenta Special treatment for partons inside extremal jets
* @returns The kinematic part of the tree matrix element
*
* cf. eq. (22) in \ref Andersen:2011hs
* Incoming particles should be ordered by ascending z momentum.
* Outgoing particles should be ordered by ascending rapidity.
*
* The tree level matrix element factorises into a parametric part
* which depends on the theory parameters (alpha_s and scale)
* and a kinematic part comprising the dependence on the particle momenta
* and colour factors. This function returns the latter.
*/
double tree_kin(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const;
/**
* \brief Calculates the Virtual Corrections
* @param mur Value of the renormalisation scale
* @param in Incoming particles
* @param out Outgoing particles
* @returns The Virtual Corrections of the Matrix Element
*
* Incoming particles should be ordered by ascending z momentum.
* Outgoing particles should be ordered by ascending rapidity.
*
* The all order virtual corrections to LL in the MRK limit is
* given by replacing 1/t in the scattering amplitude according to the
* lipatov ansatz.
*
* cf. second-to-last line of eq. (22) in \ref Andersen:2011hs
* note that indices are off by one, i.e. out[0].p corresponds to p_1
*/
double virtual_corrections(
double mur,
- std::array<Sparticle, 2> const & in,
- std::vector<Sparticle> const & out
+ std::array<Particle, 2> const & in,
+ std::vector<Particle> const & out
) const;
private:
/**
* \brief cf. last line of eq. (22) in \ref Andersen:2011hs
* @param mur Value of Renormalisation Scale
* @param q_j ???
* @param lambda ???
*/
double omega0(
double alpha_s, double mur,
fastjet::PseudoJet const & q_j, double lambda
) const;
double tree_kin_jets(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> partons,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> partons,
bool check_momenta
) const;
double tree_kin_Higgs(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const;
double tree_kin_Higgs_first(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const;
double tree_kin_Higgs_last(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const;
/**
* \brief Higgs inbetween extremal partons.
*
* Note that in the case of unordered emission, the Higgs is *always*
* treated as if in between the extremal (FKL) partons, even if its
* rapidity is outside the extremal parton rapidities
*/
double tree_kin_Higgs_between(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const;
double tree_param_partons(
double alpha_s, double mur,
- std::vector<Sparticle> const & partons
+ std::vector<Particle> const & partons
) const;
std::vector<int> in_extremal_jet_indices(
std::vector<fastjet::PseudoJet> const & partons
) const;
- std::vector<Sparticle> tag_extremal_jet_partons(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> out_partons, bool check_momenta
+ std::vector<Particle> tag_extremal_jet_partons(
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> out_partons, bool check_momenta
) const;
double MH2_forwardH(
RHEJ::ParticleID id,
CLHEP::HepLorentzVector p1out, CLHEP::HepLorentzVector p1in,
CLHEP::HepLorentzVector p2out, CLHEP::HepLorentzVector p2in,
CLHEP::HepLorentzVector pH,
double t1, double t2
) const;
std::function<double (double)> alpha_s_;
MatrixElementConfig param_;
};
}
diff --git a/include/RHEJ/PhaseSpacePoint.hh b/include/RHEJ/PhaseSpacePoint.hh
index c91f9f6..f317304 100644
--- a/include/RHEJ/PhaseSpacePoint.hh
+++ b/include/RHEJ/PhaseSpacePoint.hh
@@ -1,156 +1,156 @@
/** \file PhaseSpacePoint.hh
* \brief Contains the PhaseSpacePoint Class
*/
#pragma once
#include <vector>
#include "RHEJ/utility.hh"
#include "RHEJ/config.hh"
#include "RHEJ/Event.hh"
#include "RHEJ/Splitter.hh"
#include "RHEJ/RNG.hh"
namespace RHEJ{
//! A point in resummation phase space
class PhaseSpacePoint{
public:
//! Default PhaseSpacePoint Constructor
PhaseSpacePoint() = default;
//! PhaseSpacePoint Constructor
/**
* @param ev Clustered Jet Event
* @param conf Configuration parameters
*/
PhaseSpacePoint(
Event const & ev,
PhaseSpacePointConfig conf,
RHEJ::RNG & ran
);
//! Get Weight Function
/**
* @returns Weight of Event
*/
double weight() const{
return weight_;
}
//! Get Incoming Function
/**
* @returns Incoming Particles
*/
- std::array<Sparticle, 2> const & incoming() const{
+ std::array<Particle, 2> const & incoming() const{
return incoming_;
}
//! Get Outgoing Function
/**
* @returns Outgoing Particles
*/
- std::vector<Sparticle> const & outgoing() const{
+ std::vector<Particle> const & outgoing() const{
return outgoing_;
}
- std::unordered_map<int, std::vector<Sparticle>> const & decays() const{
+ std::unordered_map<int, std::vector<Particle>> const & decays() const{
return decays_;
}
static constexpr int ng_max = 1000; //< maximum number of extra gluons
static void reset_ranlux(std::string const & init_file);
static void reset_ranlux(char const * init_file);
private:
std::vector<fastjet::PseudoJet> cluster_jets(
std::vector<fastjet::PseudoJet> const & partons
) const;
bool pass_resummation_cuts(
std::vector<fastjet::PseudoJet> const & jets
) const;
bool pass_extremal_cuts(
fastjet::PseudoJet const & ext_parton,
fastjet::PseudoJet const & jet
) const;
int sample_ng(std::vector<fastjet::PseudoJet> const & Born_jets);
int sample_ng_jets(int ng, std::vector<fastjet::PseudoJet> const & Born_jets);
double probability_in_jet(
std::vector<fastjet::PseudoJet> const & Born_jets
) const;
std::vector<fastjet::PseudoJet> gen_non_jet(
int ng_non_jet,
double ptmin, double ptmax
);
void rescale_rapidities(
std::vector<fastjet::PseudoJet> & partons,
double ymin, double ymax
);
std::vector<fastjet::PseudoJet> reshuffle(
std::vector<fastjet::PseudoJet> const & Born_jets,
fastjet::PseudoJet const & q
);
bool jets_ok(
std::vector<fastjet::PseudoJet> const & Born_jets,
std::vector<fastjet::PseudoJet> const & partons
) const;
- void reconstruct_incoming(std::array<Sparticle, 2> const & Born_incoming);
+ void reconstruct_incoming(std::array<Particle, 2> const & Born_incoming);
double phase_space_normalisation(
int num_Born_jets,
int num_res_partons
) const;
std::vector<fastjet::PseudoJet> split(
std::vector<fastjet::PseudoJet> const & jets, int ng_jets
);
std::vector<int> distribute_jet_partons(
int ng_jets, std::vector<fastjet::PseudoJet> const & jets
);
std::vector<fastjet::PseudoJet> split(
std::vector<fastjet::PseudoJet> const & jets,
std::vector<int> const & np_in_jet
);
bool split_preserved_jets(
std::vector<fastjet::PseudoJet> const & jets,
std::vector<fastjet::PseudoJet> const & jet_partons
) const;
template<class Particle>
Particle const & most_backward_FKL(
std::vector<Particle> const & partons
) const;
template<class Particle>
Particle const & most_forward_FKL(
std::vector<Particle> const & partons
) const;
template<class Particle>
Particle & most_backward_FKL(std::vector<Particle> & partons) const;
template<class Particle>
Particle & most_forward_FKL(std::vector<Particle> & partons) const;
bool extremal_ok(
std::vector<fastjet::PseudoJet> const & partons
) const;
void copy_AWZH_boson_from(Event const & event);
bool momentum_conserved() const;
bool unob_, unof_;
double weight_;
PhaseSpacePointConfig param_;
- std::array<Sparticle, 2> incoming_;
- std::vector<Sparticle> outgoing_;
+ std::array<Particle, 2> incoming_;
+ std::vector<Particle> outgoing_;
//! Particle decays in the format {outgoing index, decay products}
- std::unordered_map<int, std::vector<Sparticle>> decays_;
+ std::unordered_map<int, std::vector<Particle>> decays_;
std::reference_wrapper<RHEJ::RNG> ran_;
HejSplit splitter_;
};
}
diff --git a/include/RHEJ/kinematics.hh b/include/RHEJ/kinematics.hh
index e882fde..a8e86c0 100644
--- a/include/RHEJ/kinematics.hh
+++ b/include/RHEJ/kinematics.hh
@@ -1,21 +1,21 @@
/** \file kinematics.hh
* \brief Contains function to compute the incoming momentum from outgoing.
*/
#pragma once
#include <tuple>
#include <vector>
namespace fastjet{
class PseudoJet;
}
namespace RHEJ{
- class Sparticle;
+ class Particle;
/** \brief incoming_momenta function to compute the incoming momentum from momentum conservation.
*/
std::tuple<fastjet::PseudoJet, fastjet::PseudoJet> incoming_momenta(
- std::vector<Sparticle> const & outgoing /**< Outgoing particles */
+ std::vector<Particle> const & outgoing /**< Outgoing particles */
);
}
diff --git a/include/RHEJ/uno.hh b/include/RHEJ/uno.hh
index 80637ee..f90d23c 100644
--- a/include/RHEJ/uno.hh
+++ b/include/RHEJ/uno.hh
@@ -1,74 +1,74 @@
/** \file uno.hh
* \brief Some boolean functions for determining if event is unordered.
*/
#pragma once
#include "RHEJ/utility.hh"
#include "RHEJ/PDG_codes.hh"
namespace RHEJ{
//! Unordered Classification Front Leg
/**
* @param incoming Incoming Particles
* @param outgoing Outgoing Particles
* @returns 0 or 1 depending if classifed as unob_gluon event
*
* This is a test applied to the most forwards (in terms of rapidity) jet.
* If the initial state leg is not a gluon, and the final state leg corresponding
* to that is a gluon then the even is deemed to be an unob_gluon event.
* This assumes that the event being tested is an FKL event wih at most
* one unordered emission.
*/
inline
bool has_unob_gluon(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing
){
return incoming.front().type != pid::gluon
&& outgoing.front().type == pid::gluon;
}
//! Unordered Classification Back Leg
/**
* @param incoming Incoming Particles
* @param outgoing Outgoing Particles
* @returns 0 or 1 depending if classifed as unof_gluon event
*
* This is a test applied to the most backwards (in terms of rapidity) jet.
* If the initial state leg is not a gluon, and the final state leg corresponding
* to that is a gluon then the even is deemed to be an unob_gluon event.
* This assumes that the event being tested is an FKL event wih at most
* one unordered emission.
*/
inline
bool has_unof_gluon(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing
){
return incoming.back().type != pid::gluon
&& outgoing.back().type == pid::gluon;
}
//! Unordered Classification
/**
* @param incoming Incoming Particles
* @param outgoing Outgoing Particles
* @returns 0 or 1 depending if classifed as unordered event
*
* This combined the functions has_unob_gluon and has_unof_gluon to see either leg
* has an unordered emission.
* This assumes that the event being tested is an FKL event wih at most
* one unordered emission.
*/
inline
bool has_uno_gluon(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing
){
return
has_unob_gluon(incoming, outgoing) || has_unof_gluon(incoming, outgoing);
}
}
diff --git a/include/RHEJ/utility.hh b/include/RHEJ/utility.hh
index 412ffdb..33ae3c1 100644
--- a/include/RHEJ/utility.hh
+++ b/include/RHEJ/utility.hh
@@ -1,145 +1,145 @@
/**
* \file utility.hh
* Author: Tuomas Hapola
- * \brief Contains the struct Sparticle which contains particle information and parameters.
+ * \brief Contains the struct Particle which contains particle information and parameters.
*
* Also contains some functions which are useful for comparison on particles parameters.
*/
#pragma once
#include <algorithm>
#include <boost/core/demangle.hpp>
// FastJet Includes
#include "fastjet/PseudoJet.hh"
#include "fastjet/ClusterSequence.hh"
#include "RHEJ/PDG_codes.hh"
namespace RHEJ{
- /** \struct Sparticle utility.hh "include/RHEJ/utility.hh"
+ /** \struct Particle utility.hh "include/RHEJ/utility.hh"
* \brief The struct which contains all the parameters of a particle.
*
* Constituted by PiD and PseudoJet Objects.
*/
- struct Sparticle {
+ struct Particle {
ParticleID type;
fastjet::PseudoJet p;
//! get rapidity function
double rapidity() const{
return p.rapidity();
}
//! get perp function
double perp() const{
return p.perp();
}
//! get Px function
double px() const{
return p.px();
}
//! get Py function
double py() const{
return p.py();
}
//! Get Pz function
double pz() const{
return p.pz();
}
//! Get P0 function
double E() const{
return p.E();
}
//! Get particle mass
double m() const{
return p.m();
}
};
/** \struct rapidity_less utility.hh "include/RHEJ/utility.hh
* \brief A struct which allows quick comparison of two different jets rapidities.
*/
struct rapidity_less{
template<class FourVector>
bool operator()(FourVector const & p1, FourVector const & p2){
return p1.rapidity() < p2.rapidity();
}
};
/** \struct pz_less utility.hh "include/RHEJ/utility.hh
* \brief A struct which allows quick comparison of Pz between two jets.
*/
struct pz_less{
template<class FourVector>
bool operator()(FourVector const & p1, FourVector const & p2){
return p1.pz() < p2.pz();
}
};
inline
std::vector<fastjet::PseudoJet> to_PseudoJet(
- std::vector<Sparticle> const & v
+ std::vector<Particle> const & v
){
std::vector<fastjet::PseudoJet> result;
for(auto && sp: v) result.emplace_back(sp.p);
return result;
}
inline
- bool is_parton(Sparticle const & p){
+ bool is_parton(Particle const & p){
return is_parton(p.type);
}
- inline bool is_AWZH_boson(Sparticle const & particle){
+ inline bool is_AWZH_boson(Particle const & particle){
return is_AWZH_boson(particle.type);
}
inline
- std::vector<Sparticle> filter_partons(
- std::vector<Sparticle> const & v
+ std::vector<Particle> filter_partons(
+ std::vector<Particle> const & v
){
- std::vector<Sparticle> result;
+ std::vector<Particle> result;
result.reserve(v.size());
std::copy_if(
begin(v), end(v), std::back_inserter(result),
- [](Sparticle const & p){ return is_parton(p); }
+ [](Particle const & p){ return is_parton(p); }
);
return result;
}
template<class T, class... Args>
std::unique_ptr<T> make_unique(Args&&... a){
return std::unique_ptr<T>{new T{std::forward<Args>(a)...}};
}
template<typename T, typename... U>
constexpr
std::array<T, 1 + sizeof...(U)> make_array(T t, U&&... rest){
return {{t, std::forward<U>(rest)...}};
}
inline
std::string join(
std::string const & /* delim */, std::string const & str
){
return str;
}
template<typename... Strings>
std::string join(
std::string const & delim,
std::string const & first, std::string const & second,
Strings&&... rest
){
return join(delim, first + delim + second, std::forward<Strings>(rest)...);
}
template<typename T>
std::string type_string(T&&){
return boost::core::demangle(typeid(T).name());
}
}
diff --git a/src/Event.cc b/src/Event.cc
index 0886a63..0995f25 100644
--- a/src/Event.cc
+++ b/src/Event.cc
@@ -1,343 +1,343 @@
#include "RHEJ/Event.hh"
#include "RHEJ/debug.hh"
namespace RHEJ{
namespace{
constexpr int status_in = -1;
constexpr int status_decayed = 2;
constexpr int status_out = 1;
// helper functions to determine event type
// check if there is at most one photon, W, H, Z in the final state
// and all the rest are quarks or gluons
- bool final_state_ok(std::vector<Sparticle> const & outgoing){
+ bool final_state_ok(std::vector<Particle> const & outgoing){
bool has_AWZH_boson = false;
for(auto const & out: outgoing){
if(is_AWZH_boson(out.type)){
if(has_AWZH_boson) return false;
has_AWZH_boson = true;
}
else if(! is_parton(out.type)) return false;
}
return true;
}
template<class Iterator>
Iterator remove_AWZH(Iterator begin, Iterator end){
return std::remove_if(
- begin, end, [](Sparticle const & p){return is_AWZH_boson(p);}
+ begin, end, [](Particle const & p){return is_AWZH_boson(p);}
);
}
template<class Iterator>
bool valid_outgoing(Iterator begin, Iterator end){
return std::distance(begin, end) >= 2
&& std::is_sorted(begin, end, rapidity_less{})
&& std::count_if(
- begin, end, [](Sparticle const & s){return is_AWZH_boson(s);}
+ begin, end, [](Particle const & s){return is_AWZH_boson(s);}
) < 2;
}
// Note that this changes the outgoing range!
template<class ConstIterator, class Iterator>
bool is_FKL(
ConstIterator begin_incoming, ConstIterator end_incoming,
Iterator begin_outgoing, Iterator end_outgoing
){
assert(std::distance(begin_incoming, end_incoming) == 2);
assert(std::distance(begin_outgoing, end_outgoing) >= 2);
// One photon, W, H, Z in the final state is allowed.
// Remove it for remaining tests,
end_outgoing = remove_AWZH(begin_outgoing, end_outgoing);
// Test if this is a standard FKL configuration.
return
(begin_incoming->type == begin_outgoing->type)
&& ((end_incoming-1)->type == (end_outgoing-1)->type)
&& std::all_of(
begin_outgoing + 1, end_outgoing - 1,
- [](Sparticle const & p){ return p.type == pid::gluon; }
+ [](Particle const & p){ return p.type == pid::gluon; }
);
}
bool is_FKL(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> outgoing
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> outgoing
){
assert(std::is_sorted(begin(incoming), end(incoming), pz_less{}));
assert(valid_outgoing(begin(outgoing), end(outgoing)));
return is_FKL(
begin(incoming), end(incoming),
begin(outgoing), end(outgoing)
);
}
bool has_2_jets(Event const & event){
return event.jets().size() >= 2;
}
/**
* \brief Checks whether event is unordered backwards
* @param ev Event
* @returns Is Event Unordered Backwards
*
* Checks there is more than 3 constuents in the final state
* Checks there is more than 3 jets
* Checks the most backwards parton is a gluon
* Checks the most forwards jet is not a gluon
* Checks the rest of the event is FKL
* Checks the second most backwards is not a different boson
* Checks the unordered gluon actually forms a jet
*/
bool is_unordered_backward(Event const & ev){
auto const & in = ev.incoming();
auto const & out = ev.outgoing();
assert(std::is_sorted(begin(in), end(in), pz_less{}));
assert(valid_outgoing(begin(out), end(out)));
if(out.size() < 3) return false;
if(ev.jets().size() < 3) return false;
if(in.front().type == pid::gluon) return false;
if(out.front().type != pid::gluon) return false;
// When skipping the unordered emission
// the remainder should be a regular FKL event,
// except that the (new) first outgoing particle must not be a A,W,Z,H.
const auto FKL_begin = next(begin(out));
if(is_AWZH_boson(*FKL_begin)) return false;
if(!is_FKL(in, {FKL_begin, end(out)})) return false;
// check that the unordered gluon forms an extra jet
const auto jets = sorted_by_rapidity(ev.jets());
const auto indices = ev.particle_jet_indices({jets.front()});
return indices[0] >= 0 && indices[1] == -1;
}
/**
* \brief Checks for a forward unordered gluon emission
* @param ev Event
* @returns Is the event a forward unordered emission
*
* \see is_unordered_backward
*/
bool is_unordered_forward(Event const & ev){
auto const & in = ev.incoming();
auto const & out = ev.outgoing();
assert(std::is_sorted(begin(in), end(in), pz_less{}));
assert(valid_outgoing(begin(out), end(out)));
if(out.size() < 3) return false;
if(ev.jets().size() < 3) return false;
if(in.back().type == pid::gluon) return false;
if(out.back().type != pid::gluon) return false;
// When skipping the unordered emission
// the remainder should be a regular FKL event,
// except that the (new) last outgoing particle must not be a A,W,Z,H.
const auto FKL_end = prev(end(out));
if(is_AWZH_boson(*prev(FKL_end))) return false;
if(!is_FKL(in, {begin(out), FKL_end})) return false;
// check that the unordered gluon forms an extra jet
const auto jets = sorted_by_rapidity(ev.jets());
const auto indices = ev.particle_jet_indices({jets.back()});
return indices.back() >= 0 && indices[indices.size()-2] == -1;
}
using event_type::EventType;
EventType classify(Event const & ev){
if(! final_state_ok(ev.outgoing())) return EventType::bad_final_state;
if(! has_2_jets(ev)) return EventType::no_2_jets;
if(is_FKL(ev.incoming(), ev.outgoing())) return EventType::FKL;
if(is_unordered_backward(ev)){
return EventType::unordered_backward;
}
if(is_unordered_forward(ev)){
return EventType::unordered_forward;
}
return EventType::nonHEJ;
}
- Sparticle extract_particle(LHEF::HEPEUP const & hepeup, int i){
- return Sparticle{
+ Particle extract_particle(LHEF::HEPEUP const & hepeup, int i){
+ return Particle{
static_cast<ParticleID>(hepeup.IDUP[i]),
fastjet::PseudoJet{
hepeup.PUP[i][0], hepeup.PUP[i][1],
hepeup.PUP[i][2], hepeup.PUP[i][3]
}
};
}
bool is_decay_product(std::pair<int, int> const & mothers){
if(mothers.first == 0) return false;
return mothers.second == 0 || mothers.first == mothers.second;
}
}
UnclusteredEvent::UnclusteredEvent(LHEF::HEPEUP const & hepeup):
central(EventParameters{
hepeup.scales.mur, hepeup.scales.muf, hepeup.weight()
})
{
size_t in_idx = 0;
for (int i = 0; i < hepeup.NUP; ++i) {
// skip decay products
// we will add them later on, but we have to ensure that
// the decayed particle is added before
if(is_decay_product(hepeup.MOTHUP[i])) continue;
auto particle = extract_particle(hepeup, i);
// needed to identify mother particles for decay products
particle.p.set_user_index(i+1);
if(hepeup.ISTUP[i] == status_in){
if(in_idx > incoming.size()) {
throw std::invalid_argument{
"Event has too many incoming particles"
};
}
incoming[in_idx++] = std::move(particle);
}
else outgoing.emplace_back(std::move(particle));
}
std::sort(
begin(incoming), end(incoming),
- [](Sparticle o1, Sparticle o2){return o1.p.pz()<o2.p.pz();}
+ [](Particle o1, Particle o2){return o1.p.pz()<o2.p.pz();}
);
std::sort(begin(outgoing), end(outgoing), rapidity_less{});
// add decay products
for (int i = 0; i < hepeup.NUP; ++i) {
if(!is_decay_product(hepeup.MOTHUP[i])) continue;
const int mother_id = hepeup.MOTHUP[i].first;
const auto mother = std::find_if(
begin(outgoing), end(outgoing),
- [mother_id](Sparticle const & particle){
+ [mother_id](Particle const & particle){
return particle.p.user_index() == mother_id;
}
);
if(mother == end(outgoing)){
throw std::invalid_argument{"invalid decay product parent"};
}
const int mother_idx = std::distance(begin(outgoing), mother);
assert(mother_idx >= 0);
decays[mother_idx].emplace_back(extract_particle(hepeup, i));
}
}
Event::Event(
UnclusteredEvent ev,
fastjet::JetDefinition const & jet_def, double min_jet_pt
):
ev_{std::move(ev)},
cs_{to_PseudoJet(filter_partons(ev_.outgoing)), jet_def},
min_jet_pt_{min_jet_pt}
{
type_ = classify(*this);
}
std::vector<fastjet::PseudoJet> Event::jets() const{
return cs_.inclusive_jets(min_jet_pt_);
}
/**
* \brief Returns the invarient mass of the event
* @param ev Event
* @returns s hat
*
* Makes use of the FastJet PseudoJet function m2().
* Applies this function to the sum of the incoming partons.
*/
double shat(Event const & ev){
return (ev.incoming()[0].p + ev.incoming()[1].p).m2();
}
namespace{
// colour flow according to Les Houches standard
// TODO: stub
std::vector<std::pair<int, int>> colour_flow(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing
){
std::vector<std::pair<int, int>> result(
incoming.size() + outgoing.size()
);
for(auto & col: result){
col = std::make_pair(-1, -1);
}
return result;
}
}
LHEF::HEPEUP to_HEPEUP(Event const & event, LHEF::HEPRUP * heprup){
LHEF::HEPEUP result;
result.heprup = heprup;
result.weights = {{event.central().weight, nullptr}};
for(auto const & var: event.variations()){
result.weights.emplace_back(var.weight, nullptr);
}
size_t num_particles = event.incoming().size() + event.outgoing().size();
for(auto const & decay: event.decays()) num_particles += decay.second.size();
result.NUP = num_particles;
// the following entries are pretty much meaningless
result.IDPRUP = event.type()+1; // event ID
result.AQEDUP = 1./128.; // alpha_EW
//result.AQCDUP = 0.118 // alpha_QCD
// end meaningless part
result.XWGTUP = event.central().weight;
result.SCALUP = event.central().muf;
result.scales.muf = event.central().muf;
result.scales.mur = event.central().mur;
result.scales.SCALUP = event.central().muf;
result.pdfinfo.p1 = event.incoming().front().type;
result.pdfinfo.p2 = event.incoming().back().type;
result.pdfinfo.scale = event.central().muf;
- for(Sparticle const & in: event.incoming()){
+ for(Particle const & in: event.incoming()){
result.IDUP.emplace_back(in.type);
result.ISTUP.emplace_back(status_in);
result.PUP.push_back({in.p[0], in.p[1], in.p[2], in.p[3], in.p.m()});
result.MOTHUP.emplace_back(0, 0);
}
for(size_t i = 0; i < event.outgoing().size(); ++i){
- Sparticle const & out = event.outgoing()[i];
+ Particle const & out = event.outgoing()[i];
result.IDUP.emplace_back(out.type);
const int status = event.decays().count(i)?status_decayed:status_out;
result.ISTUP.emplace_back(status);
result.PUP.push_back({out.p[0], out.p[1], out.p[2], out.p[3], out.p.m()});
result.MOTHUP.emplace_back(1, 2);
}
result.ICOLUP = colour_flow(
event.incoming(), filter_partons(event.outgoing())
);
if(result.ICOLUP.size() < num_particles){
const size_t AWZH_boson_idx = std::find_if(
begin(event.outgoing()), end(event.outgoing()),
- [](Sparticle const & s){ return is_AWZH_boson(s); }
+ [](Particle const & s){ return is_AWZH_boson(s); }
) - begin(event.outgoing()) + event.incoming().size();
assert(AWZH_boson_idx <= result.ICOLUP.size());
result.ICOLUP.insert(
begin(result.ICOLUP) + AWZH_boson_idx,
std::make_pair(0,0)
);
}
for(auto const & decay: event.decays()){
for(auto const out: decay.second){
result.IDUP.emplace_back(out.type);
result.ISTUP.emplace_back(status_out);
result.PUP.push_back({out.p[0], out.p[1], out.p[2], out.p[3], out.p.m()});
const int mother_idx = 1 + event.incoming().size() + decay.first;
result.MOTHUP.emplace_back(mother_idx, mother_idx);
result.ICOLUP.emplace_back(0,0);
}
}
assert(result.ICOLUP.size() == num_particles);
static constexpr double unknown_spin = 9.; //per Les Houches accord
result.VTIMUP = std::vector<double>(num_particles, unknown_spin);
result.SPINUP = result.VTIMUP;
return result;
}
}
diff --git a/src/EventReweighter.cc b/src/EventReweighter.cc
index c988b49..34c8d34 100644
--- a/src/EventReweighter.cc
+++ b/src/EventReweighter.cc
@@ -1,281 +1,281 @@
#include "RHEJ/EventReweighter.hh"
#include <string>
#include <unordered_map>
#include "RHEJ/PhaseSpacePoint.hh"
#include "RHEJ/PDG_codes.hh"
#include "RHEJ/debug.hh"
namespace RHEJ{
using EventType = event_type::EventType;
namespace {
static_assert(
std::numeric_limits<double>::has_quiet_NaN,
"no quiet NaN for double"
);
constexpr double NaN = std::numeric_limits<double>::quiet_NaN();
UnclusteredEvent to_UnclusteredEvent(PhaseSpacePoint const & psp){
UnclusteredEvent result;
result.incoming = psp.incoming();
std::sort(
begin(result.incoming), end(result.incoming),
- [](Sparticle o1, Sparticle o2){return o1.p.pz()<o2.p.pz();}
+ [](Particle o1, Particle o2){return o1.p.pz()<o2.p.pz();}
);
assert(result.incoming.size() == 2);
result.outgoing = psp.outgoing();
assert(
std::is_sorted(
begin(result.outgoing), end(result.outgoing),
rapidity_less{}
)
);
assert(result.outgoing.size() >= 2);
result.decays = psp.decays();
result.central.mur = NaN;
result.central.muf = NaN;
result.central.weight = psp.weight();
return result;
}
} // namespace anonymous
EventReweighter::EventReweighter(
LHEF::HEPRUP const & heprup,
ScaleGenerator scale_gen,
EventReweighterConfig conf,
RHEJ::RNG & ran
):
EventReweighter{
RHEJ::Beam{
heprup.EBMUP.first,
{{
static_cast<RHEJ::ParticleID>(heprup.IDBMUP.first),
static_cast<RHEJ::ParticleID>(heprup.IDBMUP.second)
}}
},
heprup.PDFSUP.first,
std::move(scale_gen),
std::move(conf),
ran
}
{
if(heprup.EBMUP.second != E_beam_){
throw std::invalid_argument(
"asymmetric beam: " + std::to_string(E_beam_)
+ " ---> <--- " + std::to_string(heprup.EBMUP.second)
);
};
if(heprup.PDFSUP.second != pdf_.id()){
throw std::invalid_argument(
"conflicting PDF ids: " + std::to_string(pdf_.id())
+ " vs. " + std::to_string(heprup.PDFSUP.second)
);
}
}
EventReweighter::EventReweighter(
Beam beam,
int pdf_id,
ScaleGenerator scale_gen,
EventReweighterConfig conf,
RHEJ::RNG & ran
):
param_{std::move(conf)},
E_beam_{beam.E},
pdf_{pdf_id, beam.type.front(), beam.type.back()},
MEt2_{
[this](double mu){ return pdf_.Halphas(mu); },
param_.ME_config
},
scale_gen_(std::move(scale_gen)),
ran_{ran}
{}
PDF const & EventReweighter::pdf() const{
return pdf_;
}
std::vector<Event> EventReweighter::reweight(
Event const & input_ev, int num_events
){
auto res_events = gen_res_events(input_ev, num_events);
if(res_events.empty()) return {};
for(auto & event: res_events) event = scale_gen_(event);
return rescale(input_ev, std::move(res_events));
}
/**
* \brief main generation/reweighting function:
* generate phase space points and divide out Born factors
*/
std::vector<Event> EventReweighter::gen_res_events(
Event const & ev,
int phase_space_points
){
assert(ev.variations().empty());
switch(param_.treat.at(ev.type())){
case EventTreatment::discard: return {};
case EventTreatment::keep:
if(! jets_pass_resummation_cuts(ev)) return {};
else return {ev};
default:;
}
const double Born_shat = shat(ev);
std::vector<Event> resummation_events;
for(int psp_number = 0; psp_number < phase_space_points; ++psp_number){
PhaseSpacePoint psp{ev, param_.psp_config, ran_};
if(psp.weight() == 0.) continue;
if(psp.incoming()[0].E() > E_beam_ || psp.incoming()[1].E() > E_beam_) continue;
resummation_events.emplace_back(
to_UnclusteredEvent(std::move(psp)),
param_.jet_param.def, param_.jet_param.min_pt
);
auto & new_event = resummation_events.back();
assert(new_event.variations().empty());
new_event.central().mur = ev.central().mur;
new_event.central().muf = ev.central().muf;
const double resum_shat = shat(new_event);
new_event.central().weight *= ev.central().weight*Born_shat*Born_shat/
(phase_space_points*resum_shat*resum_shat);
}
return resummation_events;
}
std::vector<Event> EventReweighter::rescale(
Event const & Born_ev,
std::vector<Event> events
) const{
const double Born_pdf = pdf_factors(Born_ev).central;
const double Born_ME = tree_matrix_element(Born_ev);
for(auto & cur_event: events){
const auto pdf = pdf_factors(cur_event);
assert(pdf.variations.size() == cur_event.variations().size());
const auto ME = matrix_elements(cur_event);
assert(ME.variations.size() == cur_event.variations().size());
cur_event.central().weight *= pdf.central*ME.central/(Born_pdf*Born_ME);
for(size_t i = 0; i < cur_event.variations().size(); ++i){
cur_event.variations(i).weight *=
pdf.variations[i]*ME.variations[i]/(Born_pdf*Born_ME);
}
}
return events;
};
bool EventReweighter::jets_pass_resummation_cuts(
Event const & ev
) const{
const auto out_as_PseudoJet = to_PseudoJet(filter_partons(ev.outgoing()));
fastjet::ClusterSequence cs{out_as_PseudoJet, param_.jet_param.def};
return cs.inclusive_jets(param_.jet_param.min_pt).size() == ev.jets().size();
}
EventReweighter::EventFactors
EventReweighter::pdf_factors(Event const & ev) const{
auto const & a = ev.incoming().front();
auto const & b = ev.incoming().back();
const double xa = a.p.e()/E_beam_;
const double xb = b.p.e()/E_beam_;
EventFactors result;
std::unordered_map<double, double> known_pdf;
result.central =
pdf_.pdfpt(0,xa,ev.central().muf,a.type)*
pdf_.pdfpt(1,xb,ev.central().muf,b.type);
known_pdf.emplace(ev.central().muf, result.central);
result.variations.reserve(ev.variations().size());
for(auto const & ev_param: ev.variations()){
const double muf = ev_param.muf;
auto cur_pdf = known_pdf.find(muf);
if(cur_pdf == known_pdf.end()){
cur_pdf = known_pdf.emplace(
muf,
pdf_.pdfpt(0,xa,muf,a.type)*pdf_.pdfpt(1,xb,muf,b.type)
).first;
}
result.variations.emplace_back(cur_pdf->second);
}
assert(result.variations.size() == ev.variations().size());
return result;
}
EventReweighter::EventFactors
EventReweighter::matrix_elements(Event const & ev) const{
assert(param_.treat.count(ev.type()) > 0);
if(param_.treat.find(ev.type())->second == EventTreatment::keep){
return fixed_order_scale_ME(ev);
}
// precompute overall kinematic factor
const double ME_kin = MEt2_.tree_kin(ev.incoming(), ev.outgoing(), true);
EventFactors result;
std::unordered_map<double, double> known_ME;
result.central = MEt2_(
ev.central().mur,
ev.incoming(), ev.outgoing(),
true
);
known_ME.emplace(ev.central().mur, result.central);
result.variations.reserve(ev.variations().size());
for(auto const & param: ev.variations()){
const double mur = param.mur;
auto cur_ME = known_ME.find(mur);
if(cur_ME == known_ME.end()){
const double ME = MEt2_.tree_param(
mur, ev.incoming(), ev.outgoing()
)*ME_kin*MEt2_.virtual_corrections(
mur, ev.incoming(), ev.outgoing()
);
cur_ME = known_ME.emplace(mur, ME).first;
}
result.variations.emplace_back(cur_ME->second);
}
assert(result.variations.size() == ev.variations().size());
return result;
}
double EventReweighter::tree_matrix_element(Event const & ev) const{
assert(ev.variations().empty());
assert(param_.treat.count(ev.type()) > 0);
if(param_.treat.find(ev.type())->second == EventTreatment::keep){
return fixed_order_scale_ME(ev).central;
}
return MEt2_.tree(
ev.central().mur,
ev.incoming(), ev.outgoing(),
false
);
}
EventReweighter::EventFactors
EventReweighter::fixed_order_scale_ME(Event const & ev) const{
const int alpha_s_power = std::count_if(
begin(ev.outgoing()), end(ev.outgoing()),
- [](Sparticle const & p){ return is_parton(p); }
+ [](Particle const & p){ return is_parton(p); }
);
EventFactors result;
result.central = pow(pdf_.Halphas(ev.central().mur), alpha_s_power);
for(auto const & var: ev.variations()){
result.variations.emplace_back(
pow(pdf_.Halphas(var.mur), alpha_s_power)
);
}
return result;
}
}
diff --git a/src/HepMCInterface.cc b/src/HepMCInterface.cc
index 1650922..7160ef3 100644
--- a/src/HepMCInterface.cc
+++ b/src/HepMCInterface.cc
@@ -1,144 +1,144 @@
#include "RHEJ/HepMCInterface.hh"
#include <cassert>
#ifdef RHEJ_BUILD_WITH_HepMC_VERSION
#include "RHEJ/Event.hh"
#include "HepMC/GenEvent.h"
#include "HepMC/GenVertex.h"
#include "HepMC/GenParticle.h"
#include "HepMC/GenCrossSection.h"
#include "LHEF/LHEF.h"
namespace RHEJ{
namespace {
- HepMC::FourVector to_FourVector(Sparticle const & sp){
+ HepMC::FourVector to_FourVector(Particle const & sp){
return {sp.px(), sp.py(), sp.pz(), sp.E()};
}
constexpr int status_in = -1;
constexpr int status_decayed = 3;
constexpr int status_out = 1;
template<class HepMCClass, typename... Args>
auto make_ptr(Args&&... args){
#if RHEJ_BUILD_WITH_HepMC_VERSION >= 3
return HepMC::make_shared<HepMCClass>(std::forward<Args>(args)...);
#else
return new HepMCClass(std::forward<Args>(args)...);
#endif
}
} // namespace anonymous
HepMCInterface::HepMCInterface():
event_count_(0.), tot_weight_(0.), tot_weight2_(0.)
{}
void HepMCInterface::add_weight(double const wt){
++event_count_;
tot_weight_ += wt;
tot_weight2_ += wt * wt;
}
HepMC::GenCrossSection HepMCInterface::cross_section() const {
HepMC::GenCrossSection xs;
#if RHEJ_BUILD_WITH_HepMC_VERSION >= 3
xs.set_cross_section(tot_weight_, sqrt(tot_weight2_), event_count_);
/// @TODO add number of attempted events
#else // HepMC 2
xs.set_cross_section(tot_weight_, sqrt(tot_weight2_));
#endif
return xs;
}
HepMC::GenEvent HepMCInterface::operator()(Event const & event, size_t const weight_index){
HepMC::GenEvent out_ev{HepMC::Units::GEV, HepMC::Units::MM};
auto vx = make_ptr<HepMC::GenVertex>();
for(auto const & in: event.incoming()){
vx->add_particle_in(
make_ptr<HepMC::GenParticle>(
to_FourVector(in), static_cast<int>(in.type), status_in
)
);
}
for(int i=0; i< (int) event.outgoing().size(); ++i){
auto const & out = event.outgoing()[i];
auto particle = make_ptr<HepMC::GenParticle>(
to_FourVector(out), static_cast<int>(out.type), status_out
);
const int status = event.decays().count(i)?status_decayed:status_out;
particle->set_status(status);
if( status == status_decayed){
auto vx_decay = make_ptr<HepMC::GenVertex>();
vx_decay->add_particle_in(particle);
for( auto const & out: event.decays().at(i)){
vx_decay->add_particle_out(
make_ptr<HepMC::GenParticle>(
to_FourVector(out), static_cast<int>(out.type), status_out
)
);
}
out_ev.add_vertex(vx_decay);
}
vx->add_particle_out(particle);
}
out_ev.add_vertex(vx);
// weights
EventParameters central_parameters;
if(event.variations().size() == 0){
central_parameters = event.central();
}
else{
central_parameters = event.variations(weight_index);
}
out_ev.weights().push_back(central_parameters.weight);
for(auto const & var: event.variations()){
out_ev.weights().push_back(var.weight);
}
/// @TODO add name list for weights
// cross section
add_weight(central_parameters.weight);
#if RHEJ_BUILD_WITH_HepMC_VERSION >= 3
out_ev.set_cross_section(
HepMC::make_shared<HepMC::GenCrossSection>(cross_section()) );
#else // HepMC 2
out_ev.set_cross_section( cross_section() );
out_ev.set_signal_process_id(event.type()+1); // "+1": conistent with lhe
out_ev.set_event_scale(central_parameters.mur);
#endif
out_ev.set_event_number(event_count_);
/// @TODO add alphaQCD (need function) and alphaQED
/// @TODO output pdf (currently not avaiable from event alone)
return out_ev;
}
}
#else // no HepMC => empty class
namespace HepMC {
class GenEvent {};
class GenCrossSection {};
}
namespace RHEJ{
HepMCInterface::HepMCInterface(){
throw std::invalid_argument(
"Failed to create HepMCInterface: "
"Reversed HEJ was built without HepMC support"
);
}
HepMC::GenEvent HepMCInterface::operator()(Event const &, size_t)
{return HepMC::GenEvent();}
void HepMCInterface::add_weight(double) {}
HepMC::GenCrossSection HepMCInterface::cross_section() const
{return HepMC::GenCrossSection();}
}
#endif
diff --git a/src/MatrixElement.cc b/src/MatrixElement.cc
index 3ebc3d8..a67bbc3 100644
--- a/src/MatrixElement.cc
+++ b/src/MatrixElement.cc
@@ -1,761 +1,761 @@
#include "RHEJ/MatrixElement.hh"
#include <CLHEP/Random/Randomize.h>
#include <CLHEP/Random/RanluxEngine.h>
#include "RHEJ/Constants.hh"
#include "RHEJ/currents.hh"
#include "RHEJ/PDG_codes.hh"
#include "RHEJ/uno.hh"
#include "RHEJ/debug.hh"
namespace RHEJ{
//cf. last line of eq. (22) in \ref Andersen:2011hs
double MatrixElement::omega0(
double alpha_s, double mur,
fastjet::PseudoJet const & q_j, double lambda
) const {
const double result = - alpha_s*N_C/M_PI*log(q_j.perp2()/(lambda*lambda));
if(! param_.log_correction) return result;
// use alpha_s(sqrt(q_j*lambda)), evolved to mur
return (
1. + alpha_s/(4.*M_PI)*beta0*log(mur*mur/(q_j.perp()*lambda))
)*result;
}
double MatrixElement::virtual_corrections(
double mur,
- std::array<Sparticle, 2> const & in,
- std::vector<Sparticle> const & out
+ std::array<Particle, 2> const & in,
+ std::vector<Particle> const & out
) const{
fastjet::PseudoJet const & pa = in.front().p;
#ifndef NDEBUG
fastjet::PseudoJet const & pb = in.back().p;
double const norm = (in.front().p + in.back().p).E();
#endif
assert(std::is_sorted(out.begin(), out.end(), rapidity_less{}));
assert(out.size() >= 2);
assert(pa.pz() < pb.pz());
fastjet::PseudoJet q = pa - out[0].p;
size_t first_idx = 0;
size_t last_idx = out.size() - 1;
// if there is a Higgs or unordered gluon outside the extremal partons
// then it is not part of the FKL ladder and does not contribute
// to the virtual corrections
if(out.front().type == pid::Higgs || has_unob_gluon(in, out)){
q -= out[1].p;
++first_idx;
}
if(out.back().type == pid::Higgs || has_unof_gluon(in, out)){
--last_idx;
}
double exponent = 0;
const double alpha_s = alpha_s_(mur);
for(size_t j = first_idx; j < last_idx; ++j){
exponent += omega0(alpha_s, mur, q, CLAMBDA)*(
out[j+1].rapidity() - out[j].rapidity()
);
q -= out[j+1].p;
}
assert(
nearby(q, -1*pb, norm)
|| out.back().type == pid::Higgs
|| has_unof_gluon(in, out)
);
return exp(exponent);
}
} // namespace RHEJ
namespace {
//! Lipatov vertex for partons emitted into extremal jets
double C2Lipatov(CLHEP::HepLorentzVector qav, CLHEP::HepLorentzVector qbv,
CLHEP::HepLorentzVector p1, CLHEP::HepLorentzVector p2)
{
CLHEP::HepLorentzVector temptrans=-(qav+qbv);
CLHEP::HepLorentzVector p5=qav-qbv;
CLHEP::HepLorentzVector CL=temptrans
+ p1*(qav.m2()/p5.dot(p1) + 2.*p5.dot(p2)/p1.dot(p2))
- p2*(qbv.m2()/p5.dot(p2) + 2.*p5.dot(p1)/p1.dot(p2));
// cout << "#Fadin qa : "<<qav<<endl;
// cout << "#Fadin qb : "<<qbv<<endl;
// cout << "#Fadin p1 : "<<p1<<endl;
// cout << "#Fadin p2 : "<<p2<<endl;
// cout << "#Fadin p5 : "<<p5<<endl;
// cout << "#Fadin Gauge Check : "<< CL.dot(p5)<<endl;
// cout << "#Fadin C2L : "<< -CL.dot(CL)<<" "<<-CL.dot(CL)/(qav.m2()*qbv.m2())/(4./p5.perp2())<<endl;
// TODO can this dead test go?
// if (-CL.dot(CL)<0.)
// if (fabs(CL.dot(p5))>fabs(CL.dot(CL))) // not sufficient!
// return 0.;
// else
return -CL.dot(CL);
}
//! Lipatov vertex with soft subtraction for partons emitted into extremal jets
double C2Lipatovots(CLHEP::HepLorentzVector qav, CLHEP::HepLorentzVector qbv,
CLHEP::HepLorentzVector p1, CLHEP::HepLorentzVector p2)
{
double kperp=(qav-qbv).perp();
if (kperp>RHEJ::CLAMBDA)
return C2Lipatov(qav, qbv, p1, p2)/(qav.m2()*qbv.m2());
else {
double Cls=(C2Lipatov(qav, qbv, p1, p2)/(qav.m2()*qbv.m2()));
return Cls-4./(kperp*kperp);
}
}
//! Lipatov vertex
double C2Lipatov(CLHEP::HepLorentzVector qav, CLHEP::HepLorentzVector qbv,
CLHEP::HepLorentzVector pim, CLHEP::HepLorentzVector pip,
CLHEP::HepLorentzVector pom, CLHEP::HepLorentzVector pop) // B
{
CLHEP::HepLorentzVector temptrans=-(qav+qbv);
CLHEP::HepLorentzVector p5=qav-qbv;
CLHEP::HepLorentzVector CL=temptrans
+ qav.m2()*(1./p5.dot(pip)*pip + 1./p5.dot(pop)*pop)/2.
- qbv.m2()*(1./p5.dot(pim)*pim + 1./p5.dot(pom)*pom)/2.
+ ( pip*(p5.dot(pim)/pip.dot(pim) + p5.dot(pom)/pip.dot(pom))
+ pop*(p5.dot(pim)/pop.dot(pim) + p5.dot(pom)/pop.dot(pom))
- pim*(p5.dot(pip)/pip.dot(pim) + p5.dot(pop)/pop.dot(pim))
- pom*(p5.dot(pip)/pip.dot(pom) + p5.dot(pop)/pop.dot(pom)) )/2.;
return -CL.dot(CL);
}
//! Lipatov vertex with soft subtraction
double C2Lipatovots(CLHEP::HepLorentzVector qav, CLHEP::HepLorentzVector qbv,
CLHEP::HepLorentzVector pa, CLHEP::HepLorentzVector pb,
CLHEP::HepLorentzVector p1, CLHEP::HepLorentzVector p2)
{
double kperp=(qav-qbv).perp();
if (kperp>RHEJ::CLAMBDA)
return C2Lipatov(qav, qbv, pa, pb, p1, p2)/(qav.m2()*qbv.m2());
else {
double Cls=(C2Lipatov(qav, qbv, pa, pb, p1, p2)/(qav.m2()*qbv.m2()));
double temp=Cls-4./(kperp*kperp);
return temp;
}
}
/** Matrix element squared for tree-level current-current scattering
* @param aptype Particle a PDG ID
* @param bptype Particle b PDG ID
* @param pn Particle n Momentum
* @param pb Particle b Momentum
* @param p1 Particle 1 Momentum
* @param pa Particle a Momentum
* @returns ME Squared for Tree-Level Current-Current Scattering
*/
double ME_current(
int aptype, int bptype,
CLHEP::HepLorentzVector const & pn,
CLHEP::HepLorentzVector const & pb,
CLHEP::HepLorentzVector const & p1,
CLHEP::HepLorentzVector const & pa
){
if (aptype==21&&bptype==21) {
return jM2gg(pn,pb,p1,pa);
} else if (aptype==21&&bptype!=21) {
if (bptype > 0)
return jM2qg(pn,pb,p1,pa);
else
return jM2qbarg(pn,pb,p1,pa);
}
else if (bptype==21&&aptype!=21) { // ----- || -----
if (aptype > 0)
return jM2qg(p1,pa,pn,pb);
else
return jM2qbarg(p1,pa,pn,pb);
}
else { // they are both quark
if (bptype>0) {
if (aptype>0)
return jM2qQ(pn,pb,p1,pa);
else
return jM2qQbar(pn,pb,p1,pa);
}
else {
if (aptype>0)
return jM2qQbar(p1,pa,pn,pb);
else
return jM2qbarQbar(pn,pb,p1,pa);
}
}
throw std::logic_error("unknown particle types");
}
/** \brief Matrix element squared for tree-level current-current scattering with Higgs
* @param aptype Particle a PDG ID
* @param bptype Particle b PDG ID
* @param pn Particle n Momentum
* @param pb Particle b Momentum
* @param p1 Particle 1 Momentum
* @param pa Particle a Momentum
* @param qH t-channel momentum before Higgs
* @param qHp1 t-channel momentum after Higgs
* @returns ME Squared for Tree-Level Current-Current Scattering with Higgs
*/
double ME_Higgs_current(
int aptype, int bptype,
CLHEP::HepLorentzVector const & pn,
CLHEP::HepLorentzVector const & pb,
CLHEP::HepLorentzVector const & p1,
CLHEP::HepLorentzVector const & pa,
CLHEP::HepLorentzVector const & qH, // t-channel momentum before Higgs
CLHEP::HepLorentzVector const & qHp1, // t-channel momentum after Higgs
double mt, bool include_bottom, double mb
){
if (aptype==21&&bptype==21) // gg initial state
return MH2gg(pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
else if (aptype==21&&bptype!=21) {
if (bptype > 0)
return MH2qg(pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb)*4./9.;
else
return MH2qbarg(pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb)*4./9.;
}
else if (bptype==21&&aptype!=21) {
if (aptype > 0)
return MH2qg(p1,pa,pn,pb,-qH,-qHp1,mt,include_bottom,mb)*4./9.;
else
return MH2qbarg(p1,pa,pn,pb,-qH,-qHp1,mt,include_bottom,mb)*4./9.;
}
else { // they are both quark
if (bptype>0) {
if (aptype>0)
return MH2qQ(pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb)*4.*4./(9.*9.);
else
return MH2qQbar(pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb)*4.*4./(9.*9.);
}
else {
if (aptype>0)
return MH2qQbar(p1,pa,pn,pb,-qH,-qHp1,mt,include_bottom,mb)*4.*4./(9.*9.);
else
return MH2qbarQbar(pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb)*4.*4./(9.*9.);
}
}
throw std::logic_error("unknown particle types");
}
/** \brief Current matrix element squared with Higgs and unordered forward emission
* @param aptype Particle A PDG ID
* @param bptype Particle B PDG ID
* @param punof Unordered Particle Momentum
* @param pn Particle n Momentum
* @param pb Particle b Momentum
* @param p1 Particle 1 Momentum
* @param pa Particle a Momentum
* @param qH t-channel momentum before Higgs
* @param qHp1 t-channel momentum after Higgs
* @returns ME Squared with Higgs and unordered forward emission
*/
double ME_Higgs_current_unof(
int aptype, int bptype,
CLHEP::HepLorentzVector const & punof,
CLHEP::HepLorentzVector const & pn,
CLHEP::HepLorentzVector const & pb,
CLHEP::HepLorentzVector const & p1,
CLHEP::HepLorentzVector const & pa,
CLHEP::HepLorentzVector const & qH, // t-channel momentum before Higgs
CLHEP::HepLorentzVector const & qHp1, // t-channel momentum after Higgs
double mt, bool include_bottom, double mb
){
if (aptype==21&&bptype!=21) {
if (bptype > 0)
return jM2unogqHg(punof,pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
else
return jM2unogqbarHg(punof,pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
}
else { // they are both quark
if (bptype>0) {
if (aptype>0)
return jM2unogqHQ(punof,pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
else
return jM2unogqHQbar(punof,pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
}
else {
if (aptype>0)
return jM2unogqbarHQ(punof,pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
else
return jM2unogqbarHQbar(punof,pn,pb,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
}
}
throw std::logic_error("unknown particle types");
}
/** \brief Current matrix element squared with Higgs and unordered backward emission
* @param aptype Particle A PDG ID
* @param bptype Particle B PDG ID
* @param pn Particle n Momentum
* @param pb Particle b Momentum
* @param punob Unordered back Particle Momentum
* @param p1 Particle 1 Momentum
* @param pa Particle a Momentum
* @param qH t-channel momentum before Higgs
* @param qHp1 t-channel momentum after Higgs
* @returns ME Squared with Higgs and unordered backward emission
*/
double ME_Higgs_current_unob(
int aptype, int bptype,
CLHEP::HepLorentzVector const & pn,
CLHEP::HepLorentzVector const & pb,
CLHEP::HepLorentzVector const & punob,
CLHEP::HepLorentzVector const & p1,
CLHEP::HepLorentzVector const & pa,
CLHEP::HepLorentzVector const & qH, // t-channel momentum before Higgs
CLHEP::HepLorentzVector const & qHp1, // t-channel momentum after Higgs
double mt, bool include_bottom, double mb
){
if (bptype==21&&aptype!=21) {
if (aptype > 0)
return jM2unobgHQg(pn,pb,punob,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
else
return jM2unobgHQbarg(pn,pb,punob,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
}
else { // they are both quark
if (aptype>0) {
if (bptype>0)
return jM2unobqHQg(pn,pb,punob,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
else
return jM2unobqbarHQg(pn,pb,punob,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
}
else {
if (bptype>0)
return jM2unobqHQbarg(pn,pb,punob,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
else
return jM2unobqbarHQbarg(pn,pb,punob,p1,pa,-qHp1,-qH,mt,include_bottom,mb);
}
}
throw std::logic_error("unknown particle types");
}
- CLHEP::HepLorentzVector to_HepLorentzVector(RHEJ::Sparticle const & particle){
+ CLHEP::HepLorentzVector to_HepLorentzVector(RHEJ::Particle const & particle){
return {particle.p.px(), particle.p.py(), particle.p.pz(), particle.p.E()};
}
} // namespace anonymous
namespace RHEJ{
MatrixElement::MatrixElement(
std::function<double (double)> alpha_s,
MatrixElementConfig conf
):
alpha_s_{std::move(alpha_s)},
param_{std::move(conf)}
{}
double MatrixElement::operator()(
double mur,
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const {
return tree(
mur,
incoming, outgoing,
check_momenta
)*virtual_corrections(
mur,
incoming, outgoing
);
}
double MatrixElement::tree_kin(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const {
assert(
std::is_sorted(
incoming.begin(), incoming.end(),
- [](Sparticle o1, Sparticle o2){return o1.p.pz()<o2.p.pz();}
+ [](Particle o1, Particle o2){return o1.p.pz()<o2.p.pz();}
)
);
assert(std::is_sorted(outgoing.begin(), outgoing.end(), rapidity_less{}));
auto AWZH_boson = std::find_if(
begin(outgoing), end(outgoing),
- [](Sparticle const & p){return is_AWZH_boson(p);}
+ [](Particle const & p){return is_AWZH_boson(p);}
);
if(AWZH_boson == end(outgoing)){
return tree_kin_jets(incoming, outgoing, check_momenta);
}
switch(AWZH_boson->type){
case pid::Higgs: {
static constexpr double mH = 125.;
const double alpha_s_mH = alpha_s_(mH);
return alpha_s_mH*alpha_s_mH/(256.*pow(M_PI, 5))*tree_kin_Higgs(
incoming, outgoing, check_momenta
);
}
// TODO
case pid::Wp:
case pid::Wm:
case pid::photon:
case pid::Z:
default:
throw std::logic_error("Emission of boson of unsupported type");
}
}
namespace{
constexpr int extremal_jet_idx = 1;
constexpr int no_extremal_jet_idx = 0;
- bool treat_as_extremal(Sparticle const & parton){
+ bool treat_as_extremal(Particle const & parton){
return parton.p.user_index() == extremal_jet_idx;
}
template<class InputIterator>
double FKL_ladder_weight(
InputIterator begin_gluon, InputIterator end_gluon,
CLHEP::HepLorentzVector const & q0,
CLHEP::HepLorentzVector const & pa, CLHEP::HepLorentzVector const & pb,
CLHEP::HepLorentzVector const & p1, CLHEP::HepLorentzVector const & pn
){
double wt = 1;
auto qi = q0;
for(auto gluon_it = begin_gluon; gluon_it != end_gluon; ++gluon_it){
assert(gluon_it->type == pid::gluon);
const auto g = to_HepLorentzVector(*gluon_it);
const auto qip1 = qi - g;
if(treat_as_extremal(*gluon_it)){
wt *= C2Lipatovots(qip1, qi, pa, pb)*C_A;
} else{
wt *= C2Lipatovots(qip1, qi, pa, pb, p1, pn)*C_A;
}
qi = qip1;
}
return wt;
}
} // namespace anonymous
- std::vector<Sparticle> MatrixElement::tag_extremal_jet_partons(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> out_partons, bool check_momenta
+ std::vector<Particle> MatrixElement::tag_extremal_jet_partons(
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> out_partons, bool check_momenta
) const{
if(!check_momenta){
for(auto & parton: out_partons){
parton.p.set_user_index(no_extremal_jet_idx);
}
return out_partons;
}
fastjet::ClusterSequence cs(to_PseudoJet(out_partons), param_.jet_param.def);
const auto jets = sorted_by_rapidity(cs.inclusive_jets(param_.jet_param.min_pt));
assert(jets.size() >= 2);
auto most_backward = begin(jets);
auto most_forward = end(jets) - 1;
// skip jets caused by unordered emission
if(has_unob_gluon(incoming, out_partons)){
assert(jets.size() >= 3);
++most_backward;
}
else if(has_unof_gluon(incoming, out_partons)){
assert(jets.size() >= 3);
--most_forward;
}
const auto extremal_jet_indices = cs.particle_jet_indices(
{*most_backward, *most_forward}
);
assert(extremal_jet_indices.size() == out_partons.size());
for(size_t i = 0; i < out_partons.size(); ++i){
assert(RHEJ::is_parton(out_partons[i]));
const int idx = (extremal_jet_indices[i]>=0)?
extremal_jet_idx:
no_extremal_jet_idx;
out_partons[i].p.set_user_index(idx);
}
return out_partons;
}
double MatrixElement::tree_kin_jets(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> partons,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> partons,
bool check_momenta
) const {
partons = tag_extremal_jet_partons(incoming, partons, check_momenta);
if(has_unob_gluon(incoming, partons) || has_unof_gluon(incoming, partons)){
throw std::logic_error("unordered emission not implemented for pure jets");
}
const auto pa = to_HepLorentzVector(incoming[0]);
const auto pb = to_HepLorentzVector(incoming[1]);
const auto p1 = to_HepLorentzVector(partons.front());
const auto pn = to_HepLorentzVector(partons.back());
return ME_current(
incoming[0].type, incoming[1].type,
pn, pb, p1, pa
)/(4*(N_C*N_C - 1))*FKL_ladder_weight(
begin(partons) + 1, end(partons) - 1,
pa - p1, pa, pb, p1, pn
);
}
double MatrixElement::tree_kin_Higgs(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const {
if(has_uno_gluon(incoming, outgoing)){
return tree_kin_Higgs_between(incoming, outgoing, check_momenta);
}
if(outgoing.front().type == pid::Higgs){
return tree_kin_Higgs_first(incoming, outgoing, check_momenta);
}
if(outgoing.back().type == pid::Higgs){
return tree_kin_Higgs_last(incoming, outgoing, check_momenta);
}
return tree_kin_Higgs_between(incoming, outgoing, check_momenta);
}
double MatrixElement::MH2_forwardH(
RHEJ::ParticleID id,
CLHEP::HepLorentzVector p1out, CLHEP::HepLorentzVector p1in,
CLHEP::HepLorentzVector p2out, CLHEP::HepLorentzVector p2in,
CLHEP::HepLorentzVector pH,
double t1, double t2
) const{
ignore(p2out, p2in);
const double shat = p1in.invariantMass2(p2in);
assert(RHEJ::is_parton(id));
if(id != RHEJ::pid::gluon){
return 9./2.*shat*shat*C2qHqm(p1in,p1out,pH)/(t1*t2);
}
// gluon case
#ifdef RHEJ_BUILD_WITH_QCDLOOP
if(!param_.Higgs_coupling.use_impact_factors){
return C_A/C_F*1./(16*M_PI*M_PI)*t1/t2*MH2gq_outsideH(
p1out, p1in, p2out, p2in, pH,
param_.Higgs_coupling.mt, param_.Higgs_coupling.include_bottom,
param_.Higgs_coupling.mb
);
}
#endif
return 9./2.*shat*shat*(
C2gHgp(p1in,p1out,pH) + C2gHgm(p1in,p1out,pH)
)/(t1*t2);
}
double MatrixElement::tree_kin_Higgs_first(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const {
assert(outgoing.front().type == pid::Higgs);
const auto pH = to_HepLorentzVector(outgoing.front());
const auto partons = tag_extremal_jet_partons(
incoming,
- std::vector<Sparticle>(begin(outgoing) + 1, end(outgoing)),
+ std::vector<Particle>(begin(outgoing) + 1, end(outgoing)),
check_momenta
);
const auto pa = to_HepLorentzVector(incoming[0]);
const auto pb = to_HepLorentzVector(incoming[1]);
const auto p1 = to_HepLorentzVector(partons.front());
const auto pn = to_HepLorentzVector(partons.back());
const auto q0 = pa - p1 - pH;
const double t1 = q0.m2();
const double t2 = (pn - pb).m2();
double wt = MH2_forwardH(
incoming[0].type, p1, pa, pn, pb, pH,
t1, t2
)*FKL_ladder_weight(
begin(partons) + 1, end(partons) - 1,
q0, pa, pb, p1, pn
);
for(auto const & inc: incoming){
if(inc.type != pid::gluon) wt *= C_F/C_A;
}
return wt;
}
double MatrixElement::tree_kin_Higgs_last(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const {
assert(outgoing.back().type == pid::Higgs);
const auto pH = to_HepLorentzVector(outgoing.back());
const auto partons = tag_extremal_jet_partons(
incoming,
- std::vector<Sparticle>(begin(outgoing), end(outgoing) - 1),
+ std::vector<Particle>(begin(outgoing), end(outgoing) - 1),
check_momenta
);
const auto pa = to_HepLorentzVector(incoming[0]);
const auto pb = to_HepLorentzVector(incoming[1]);
auto p1 = to_HepLorentzVector(partons.front());
const auto pn = to_HepLorentzVector(partons.back());
auto q0 = pa - p1;
const double t1 = q0.m2();
const double t2 = (pn + pH - pb).m2();
double wt = MH2_forwardH(
incoming[1].type, pn, pb, p1, pa, pH,
t2, t1
)*FKL_ladder_weight(
begin(partons) + 1, end(partons) - 1,
q0, pa, pb, p1, pn
);
for(auto const & inc: incoming){
if(inc.type != pid::gluon) wt *= C_F/C_A;
}
return wt;
}
double MatrixElement::tree_kin_Higgs_between(
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const {
const auto the_Higgs = std::find_if(
begin(outgoing), end(outgoing),
- [](Sparticle const & s){ return s.type == pid::Higgs; }
+ [](Particle const & s){ return s.type == pid::Higgs; }
);
assert(the_Higgs != end(outgoing));
const auto pH = to_HepLorentzVector(*the_Higgs);
- std::vector<Sparticle> partons(begin(outgoing), the_Higgs);
+ std::vector<Particle> partons(begin(outgoing), the_Higgs);
partons.insert(end(partons), the_Higgs + 1, end(outgoing));
partons = tag_extremal_jet_partons(incoming, partons, check_momenta);
const auto pa = to_HepLorentzVector(incoming[0]);
const auto pb = to_HepLorentzVector(incoming[1]);
auto p1 = to_HepLorentzVector(
partons[has_unob_gluon(incoming, outgoing)?1:0]
);
auto pn = to_HepLorentzVector(
partons[partons.size() - (has_unof_gluon(incoming, outgoing)?2:1)]
);
auto first_after_Higgs = begin(partons) + (the_Higgs-begin(outgoing));
assert(
(first_after_Higgs == end(partons) && has_unob_gluon(incoming, outgoing))
|| first_after_Higgs->rapidity() >= the_Higgs->rapidity()
);
assert(
(first_after_Higgs == begin(partons) && has_unof_gluon(incoming, outgoing))
|| (first_after_Higgs-1)->rapidity() <= the_Higgs->rapidity()
);
// always treat the Higgs as if it were in between the extremal FKL partons
if(first_after_Higgs == begin(partons)) ++first_after_Higgs;
else if(first_after_Higgs == end(partons)) --first_after_Higgs;
// t-channel momentum before Higgs
auto qH = pa;
for(auto parton_it = begin(partons); parton_it != first_after_Higgs; ++parton_it){
qH -= to_HepLorentzVector(*parton_it);
}
auto q0 = pa - p1;
auto begin_ladder = begin(partons) + 1;
auto end_ladder = end(partons) - 1;
double current_factor;
if(has_unob_gluon(incoming, outgoing)){
current_factor = 9./2.*ME_Higgs_current_unob(
incoming[0].type, incoming[1].type,
pn, pb, to_HepLorentzVector(partons.front()), p1, pa, qH, qH - pH,
param_.Higgs_coupling.mt,
param_.Higgs_coupling.include_bottom, param_.Higgs_coupling.mb
);
const auto p_unob = to_HepLorentzVector(partons.front());
q0 -= p_unob;
p1 += p_unob;
++begin_ladder;
}
else if(has_unof_gluon(incoming, outgoing)){
current_factor = 9./2.*ME_Higgs_current_unof(
incoming[0].type, incoming[1].type,
to_HepLorentzVector(partons.back()), pn, pb, p1, pa, qH, qH - pH,
param_.Higgs_coupling.mt,
param_.Higgs_coupling.include_bottom, param_.Higgs_coupling.mb
);
pn += to_HepLorentzVector(partons.back());
--end_ladder;
}
else{
current_factor = ME_Higgs_current(
incoming[0].type, incoming[1].type,
pn, pb, p1, pa, qH, qH - pH,
param_.Higgs_coupling.mt,
param_.Higgs_coupling.include_bottom, param_.Higgs_coupling.mb
);
}
const double ladder_factor = FKL_ladder_weight(
begin_ladder, first_after_Higgs,
q0, pa, pb, p1, pn
)*FKL_ladder_weight(
first_after_Higgs, end_ladder,
qH - pH, pa, pb, p1, pn
);
return current_factor*9./8.*ladder_factor;
}
double MatrixElement::tree_param_partons(
double alpha_s, double mur,
- std::vector<Sparticle> const & partons
+ std::vector<Particle> const & partons
) const{
const double gs2 = 4.*M_PI*alpha_s;
double wt = std::pow(gs2, partons.size());
if(param_.log_correction){
// use alpha_s(q_perp), evolved to mur
assert(partons.size() >= 2);
for(size_t i = 1; i < partons.size()-1; ++i){
wt *= 1 + alpha_s/(2*M_PI)*beta0*log(mur/partons[i].p.perp());
}
}
return wt;
}
double MatrixElement::tree_param(
double mur,
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing
) const{
const double alpha_s = alpha_s_(mur);
if(has_unob_gluon(incoming, outgoing)){
return 4*M_PI*alpha_s*tree_param_partons(
alpha_s, mur, filter_partons({begin(outgoing) + 1, end(outgoing)})
);
}
if(has_unof_gluon(incoming, outgoing)){
return 4*M_PI*alpha_s*tree_param_partons(
alpha_s, mur, filter_partons({begin(outgoing), end(outgoing) - 1})
);
}
return tree_param_partons(alpha_s, mur, filter_partons(outgoing));
}
double MatrixElement::tree(
double mur,
- std::array<Sparticle, 2> const & incoming,
- std::vector<Sparticle> const & outgoing,
+ std::array<Particle, 2> const & incoming,
+ std::vector<Particle> const & outgoing,
bool check_momenta
) const {
return tree_param(mur, incoming, outgoing)*tree_kin(
incoming, outgoing, check_momenta
);
}
} // namespace RHEJ
diff --git a/src/PhaseSpacePoint.cc b/src/PhaseSpacePoint.cc
index c191825..5067a0b 100644
--- a/src/PhaseSpacePoint.cc
+++ b/src/PhaseSpacePoint.cc
@@ -1,535 +1,535 @@
#include "RHEJ/PhaseSpacePoint.hh"
#include <random>
#include <CLHEP/Random/Randomize.h>
#include <CLHEP/Random/RanluxEngine.h>
#include "RHEJ/Constants.hh"
#include "RHEJ/resummation_jet_momenta.hh"
#include "RHEJ/Jacobian.hh"
#include "RHEJ/uno.hh"
#include "RHEJ/debug.hh"
#include "RHEJ/kinematics.hh"
namespace RHEJ{
namespace {
constexpr int max_jet_user_idx = PhaseSpacePoint::ng_max;
bool is_nonjet_parton(fastjet::PseudoJet const & parton){
assert(parton.user_index() != -1);
return parton.user_index() > max_jet_user_idx;
}
bool is_jet_parton(fastjet::PseudoJet const & parton){
assert(parton.user_index() != -1);
return parton.user_index() <= max_jet_user_idx;
}
// user indices for partons with extremal rapidity
constexpr int unob_idx = -5;
constexpr int unof_idx = -4;
constexpr int backward_FKL_idx = -3;
constexpr int forward_FKL_idx = -2;
}
namespace {
double estimate_ng_mean(std::vector<fastjet::PseudoJet> const & Born_jets){
const double delta_y =
Born_jets.back().rapidity() - Born_jets.front().rapidity();
assert(delta_y > 0);
// Formula derived from fit in reversed HEJ intro paper
return 0.975052*delta_y;
}
}
std::vector<fastjet::PseudoJet> PhaseSpacePoint::cluster_jets(
std::vector<fastjet::PseudoJet> const & partons
) const{
fastjet::ClusterSequence cs(partons, param_.jet_param.def);
return cs.inclusive_jets(param_.jet_param.min_pt);
}
bool PhaseSpacePoint::pass_resummation_cuts(
std::vector<fastjet::PseudoJet> const & jets
) const{
return cluster_jets(jets).size() == jets.size();
}
int PhaseSpacePoint::sample_ng(std::vector<fastjet::PseudoJet> const & Born_jets){
const double ng_mean = estimate_ng_mean(Born_jets);
std::poisson_distribution<int> dist(ng_mean);
const int ng = dist(ran_.get());
assert(ng >= 0);
assert(ng < ng_max);
weight_ *= std::tgamma(ng + 1)*std::exp(ng_mean)*std::pow(ng_mean, -ng);
return ng;
}
void PhaseSpacePoint::copy_AWZH_boson_from(Event const & event){
auto const & from = event.outgoing();
const auto AWZH_boson = std::find_if(
begin(from), end(from),
- [](Sparticle const & p){ return is_AWZH_boson(p); }
+ [](Particle const & p){ return is_AWZH_boson(p); }
);
if(AWZH_boson == end(from)) return;
auto insertion_point = std::lower_bound(
begin(outgoing_), end(outgoing_), *AWZH_boson, rapidity_less{}
);
outgoing_.insert(insertion_point, *AWZH_boson);
// copy decay products
const int idx = std::distance(begin(from), AWZH_boson);
const auto decay_it = event.decays().find(idx);
if(decay_it != end(event.decays())){
const int new_idx = std::distance(begin(outgoing_), insertion_point);
assert(outgoing_[new_idx].type == AWZH_boson->type);
decays_.emplace(new_idx, decay_it->second);
}
assert(std::is_sorted(begin(outgoing_), end(outgoing_), rapidity_less{}));
}
PhaseSpacePoint::PhaseSpacePoint(
Event const & ev, PhaseSpacePointConfig conf, RHEJ::RNG & ran
):
unob_{has_unob_gluon(ev.incoming(), ev.outgoing())},
unof_{!unob_ && has_unof_gluon(ev.incoming(), ev.outgoing())},
param_{std::move(conf)},
ran_{ran},
splitter_{param_.jet_param.def.R(), param_.jet_param.def, param_.jet_param.min_pt, ran}
{
weight_ = 1;
const auto Born_jets = sorted_by_rapidity(ev.jets());
const int ng = sample_ng(Born_jets);
weight_ /= std::tgamma(ng + 1);
const int ng_jets = sample_ng_jets(ng, Born_jets);
std::vector<fastjet::PseudoJet> out_partons = gen_non_jet(
ng - ng_jets, CMINPT, param_.jet_param.min_pt
);
{
const auto qperp = std::accumulate(
begin(out_partons), end(out_partons),
fastjet::PseudoJet{}
);
const auto jets = reshuffle(Born_jets, qperp);
if(weight_ == 0.) return;
if(! pass_resummation_cuts(jets)){
weight_ = 0.;
return;
}
std::vector<fastjet::PseudoJet> jet_partons = split(jets, ng_jets);
if(weight_ == 0.) return;
rescale_rapidities(
out_partons,
most_backward_FKL(jet_partons).rapidity(),
most_forward_FKL(jet_partons).rapidity()
);
if(! cluster_jets(out_partons).empty()){
weight_ = 0.;
return;
}
std::sort(begin(out_partons), end(out_partons), rapidity_less{});
assert(
std::is_sorted(begin(jet_partons), end(jet_partons), rapidity_less{})
);
const auto first_jet_parton = out_partons.insert(
end(out_partons), begin(jet_partons), end(jet_partons)
);
std::inplace_merge(
begin(out_partons), first_jet_parton, end(out_partons), rapidity_less{}
);
}
if(! jets_ok(Born_jets, out_partons)){
weight_ = 0.;
return;
}
weight_ *= phase_space_normalisation(Born_jets.size(), out_partons.size());
outgoing_.reserve(out_partons.size() + 1); // one slot for possible A, W, Z, H
for(auto & p: out_partons){
- outgoing_.emplace_back(Sparticle{pid::gluon, std::move(p)});
+ outgoing_.emplace_back(Particle{pid::gluon, std::move(p)});
}
most_backward_FKL(outgoing_).type = ev.incoming().front().type;
most_forward_FKL(outgoing_).type = ev.incoming().back().type;
copy_AWZH_boson_from(ev);
assert(!outgoing_.empty());
reconstruct_incoming(ev.incoming());
}
std::vector<fastjet::PseudoJet> PhaseSpacePoint::gen_non_jet(
int count, double ptmin, double ptmax
){
// heuristic parameters for pt sampling
const double ptpar = 1.3 + count/5.;
const double temp1 = atan((ptmax - ptmin)/ptpar);
std::vector<fastjet::PseudoJet> partons(count);
for(size_t i = 0; i < (size_t) count; ++i){
const double r1 = ran_.get().flat();
const double pt = ptmin + ptpar*tan(r1*temp1);
const double temp2 = cos(r1*temp1);
const double phi = 2*M_PI*ran_.get().flat();
weight_ *= 2.0*M_PI*pt*ptpar*temp1/(temp2*temp2);
// we don't know the allowed rapidity span yet,
// set a random value to be rescaled later on
const double y = ran_.get().flat();
partons[i].reset_PtYPhiM(pt, y, phi);
// Set user index higher than any jet-parton index
// in order to assert that these are not inside jets
partons[i].set_user_index(i + 1 + ng_max);
assert(ptmin-1e-5 <= partons[i].pt() && partons[i].pt() <= ptmax+1e-5);
}
assert(std::all_of(partons.cbegin(), partons.cend(), is_nonjet_parton));
return partons;
}
void PhaseSpacePoint::rescale_rapidities(
std::vector<fastjet::PseudoJet> & partons,
double ymin, double ymax
){
constexpr double ep = 1e-7;
for(auto & parton: partons){
assert(0 <= parton.rapidity() && parton.rapidity() <= 1);
const double dy = ymax - ymin - 2*ep;
const double y = ymin + ep + dy*parton.rapidity();
parton.reset_momentum_PtYPhiM(parton.pt(), y, parton.phi());
weight_ *= dy;
assert(ymin <= parton.rapidity() && parton.rapidity() <= ymax);
}
}
namespace {
template<typename T, typename... Rest>
auto min(T const & a, T const & b, Rest&&... r) {
using std::min;
return min(a, min(b, std::forward<Rest>(r)...));
}
}
double PhaseSpacePoint::probability_in_jet(
std::vector<fastjet::PseudoJet> const & Born_jets
) const{
assert(std::is_sorted(begin(Born_jets), end(Born_jets), rapidity_less{}));
assert(Born_jets.size() >= 2);
const double dy =
Born_jets.back().rapidity() - Born_jets.front().rapidity();
const double R = param_.jet_param.def.R();
const int njets = Born_jets.size();
const double p_J_y_large = (njets-1)*R*R/(2.*dy);
const double p_J_y0 = njets*R/M_PI;
return min(p_J_y_large, p_J_y0, 1.);
}
int PhaseSpacePoint::sample_ng_jets(
int ng, std::vector<fastjet::PseudoJet> const & Born_jets
){
const double p_J = probability_in_jet(Born_jets);
std::binomial_distribution<> bin_dist(ng, p_J);
const int ng_J = bin_dist(ran_.get());
weight_ *= std::pow(p_J, -ng_J)*std::pow(1 - p_J, ng_J - ng);
return ng_J;
}
std::vector<fastjet::PseudoJet>
PhaseSpacePoint::reshuffle(
std::vector<fastjet::PseudoJet> const & Born_jets,
fastjet::PseudoJet const & q
){
if(q == fastjet::PseudoJet{0, 0, 0, 0}) return Born_jets;
std::vector<fastjet::PseudoJet> jets = resummation_jet_momenta(Born_jets, q);
if(jets.empty()){
weight_ = 0;
return {};
}
// transform delta functions to integration over resummation momenta
weight_ /= Jacobian(jets, q);
return jets;
}
std::vector<int> PhaseSpacePoint::distribute_jet_partons(
int ng_jets, std::vector<fastjet::PseudoJet> const & jets
){
size_t first_valid_jet = 0;
size_t num_valid_jets = jets.size();
const double R_eff = 5./3.*param_.jet_param.def.R();
// if there is an unordered jet too far away from the FKL jets
// then extra gluon constituents of the unordered jet would
// violate the FKL rapidity ordering
if(unob_ && jets[0].delta_R(jets[1]) > R_eff){
++first_valid_jet;
--num_valid_jets;
}
else if(unof_ && jets[jets.size()-1].delta_R(jets[jets.size()-2]) > R_eff){
--num_valid_jets;
}
std::vector<int> np(jets.size(), 1);
for(int i = 0; i < ng_jets; ++i){
++np[first_valid_jet + ran_.get().flat() * num_valid_jets];
}
weight_ *= std::pow(num_valid_jets, ng_jets);
return np;
}
#ifndef NDEBUG
namespace{
bool tagged_FKL_backward(
std::vector<fastjet::PseudoJet> const & jet_partons
){
return std::find_if(
begin(jet_partons), end(jet_partons),
[](fastjet::PseudoJet const & p){
return p.user_index() == backward_FKL_idx;
}
) != end(jet_partons);
}
bool tagged_FKL_forward(
std::vector<fastjet::PseudoJet> const & jet_partons
){
// the most forward FKL parton is most likely near the end of jet_partons;
// start search from there
return std::find_if(
jet_partons.rbegin(), jet_partons.rend(),
[](fastjet::PseudoJet const & p){
return p.user_index() == forward_FKL_idx;
}
) != jet_partons.rend();
}
bool tagged_FKL_extremal(
std::vector<fastjet::PseudoJet> const & jet_partons
){
return tagged_FKL_backward(jet_partons) && tagged_FKL_forward(jet_partons);
}
} // namespace anonymous
#endif
std::vector<fastjet::PseudoJet> PhaseSpacePoint::split(
std::vector<fastjet::PseudoJet> const & jets,
int ng_jets
){
return split(jets, distribute_jet_partons(ng_jets, jets));
}
bool PhaseSpacePoint::pass_extremal_cuts(
fastjet::PseudoJet const & ext_parton,
fastjet::PseudoJet const & jet
) const{
if(ext_parton.pt() < param_.min_extparton_pt) return false;
return (ext_parton - jet).pt()/jet.pt() < param_.max_ext_soft_pt_fraction;
}
std::vector<fastjet::PseudoJet> PhaseSpacePoint::split(
std::vector<fastjet::PseudoJet> const & jets,
std::vector<int> const & np
){
assert(! jets.empty());
assert(jets.size() == np.size());
assert(pass_resummation_cuts(jets));
const size_t most_backward_FKL_idx = 0 + unob_;
const size_t most_forward_FKL_idx = jets.size() - 1 - unof_;
std::vector<fastjet::PseudoJet> jet_partons;
// randomly distribute jet gluons among jets
for(size_t i = 0; i < jets.size(); ++i){
weight_ *= splitter_.Split(jets[i], np[i]);
if(weight_ == 0) return {};
assert(
std::all_of(
begin(splitter_.get_jcons()), end(splitter_.get_jcons()),
is_jet_parton
)
);
const auto first_new_parton = jet_partons.insert(
end(jet_partons),
begin(splitter_.get_jcons()), end(splitter_.get_jcons())
);
// mark uno and extremal FKL emissions here so we can check
// their position once all emissions are generated
auto extremal = end(jet_partons);
if((unob_ && i == 0) || i == most_backward_FKL_idx){
// unordered or FKL backward emission
extremal = std::min_element(
first_new_parton, end(jet_partons), rapidity_less{}
);
extremal->set_user_index(
(i == most_backward_FKL_idx)?backward_FKL_idx:unob_idx
);
}
else if((unof_ && i == jets.size() - 1) || i == most_forward_FKL_idx){
// unordered or FKL forward emission
extremal = std::max_element(
first_new_parton, end(jet_partons), rapidity_less{}
);
extremal->set_user_index(
(i == most_forward_FKL_idx)?forward_FKL_idx:unof_idx
);
}
if(
extremal != end(jet_partons)
&& !pass_extremal_cuts(*extremal, jets[i])
){
weight_ = 0;
return {};
}
}
assert(tagged_FKL_extremal(jet_partons));
std::sort(begin(jet_partons), end(jet_partons), rapidity_less{});
if(
!extremal_ok(jet_partons)
|| !split_preserved_jets(jets, jet_partons)
){
weight_ = 0.;
return {};
}
return jet_partons;
}
bool PhaseSpacePoint::extremal_ok(
std::vector<fastjet::PseudoJet> const & partons
) const{
assert(std::is_sorted(begin(partons), end(partons), rapidity_less{}));
if(unob_ && partons.front().user_index() != unob_idx) return false;
if(unof_ && partons.back().user_index() != unof_idx) return false;
return
most_backward_FKL(partons).user_index() == backward_FKL_idx
&& most_forward_FKL(partons).user_index() == forward_FKL_idx;
}
bool PhaseSpacePoint::split_preserved_jets(
std::vector<fastjet::PseudoJet> const & jets,
std::vector<fastjet::PseudoJet> const & jet_partons
) const{
assert(std::is_sorted(begin(jets), end(jets), rapidity_less{}));
const auto split_jets = sorted_by_rapidity(cluster_jets(jet_partons));
// this can happen if two overlapping jets
// are both split into more than one parton
if(split_jets.size() != jets.size()) return false;
for(size_t i = 0; i < split_jets.size(); ++i){
// this can happen if there are two overlapping jets
// and a parton is assigned to the "wrong" jet
if(!nearby_ep(jets[i].rapidity(), split_jets[i].rapidity(), 1e-2)){
return false;
}
}
return true;
}
template<class Particle>
Particle const & PhaseSpacePoint::most_backward_FKL(
std::vector<Particle> const & partons
) const{
return partons[0 + unob_];
}
template<class Particle>
Particle const & PhaseSpacePoint::most_forward_FKL(
std::vector<Particle> const & partons
) const{
const size_t idx = partons.size() - 1 - unof_;
assert(idx < partons.size());
return partons[idx];
}
template<class Particle>
Particle & PhaseSpacePoint::most_backward_FKL(
std::vector<Particle> & partons
) const{
return partons[0 + unob_];
}
template<class Particle>
Particle & PhaseSpacePoint::most_forward_FKL(
std::vector<Particle> & partons
) const{
const size_t idx = partons.size() - 1 - unof_;
assert(idx < partons.size());
return partons[idx];
}
namespace {
bool contains_idx(
fastjet::PseudoJet const & jet, fastjet::PseudoJet const & parton
){
auto const & constituents = jet.constituents();
const int idx = parton.user_index();
return std::find_if(
begin(constituents), end(constituents),
[idx](fastjet::PseudoJet const & con){return con.user_index() == idx;}
) != end(constituents);
}
}
/**
* final jet test:
* - number of jets must match Born kinematics
* - no partons designated as nonjet may end up inside jets
* - all other outgoing partons *must* end up inside jets
* - the extremal (in rapidity) partons must be inside the extremal jets
* - rapidities must be the same (by construction)
*/
bool PhaseSpacePoint::jets_ok(
std::vector<fastjet::PseudoJet> const & Born_jets,
std::vector<fastjet::PseudoJet> const & partons
) const{
fastjet::ClusterSequence cs(partons, param_.jet_param.def);
const auto jets = sorted_by_rapidity(cs.inclusive_jets(param_.jet_param.min_pt));
if(jets.size() != Born_jets.size()) return false;
int in_jet = 0;
for(size_t i = 0; i < jets.size(); ++i){
assert(jets[i].has_constituents());
for(auto && parton: jets[i].constituents()){
if(is_nonjet_parton(parton)) return false;
}
in_jet += jets[i].constituents().size();
}
const int expect_in_jet = std::count_if(
partons.cbegin(), partons.cend(), is_jet_parton
);
if(in_jet != expect_in_jet) return false;
// note that PseudoJet::contains does not work here
if(! (
contains_idx(most_backward_FKL(jets), most_backward_FKL(partons))
&& contains_idx(most_forward_FKL(jets), most_forward_FKL(partons))
)) return false;
if(unob_ && !contains_idx(jets.front(), partons.front())) return false;
if(unof_ && !contains_idx(jets.back(), partons.back())) return false;
for(size_t i = 0; i < jets.size(); ++i){
assert(nearby_ep(jets[i].rapidity(), Born_jets[i].rapidity(), 1e-2));
}
return true;
}
void PhaseSpacePoint::reconstruct_incoming(
- std::array<Sparticle, 2> const & Born_incoming
+ std::array<Particle, 2> const & Born_incoming
){
std::tie(incoming_[0].p, incoming_[1].p) = incoming_momenta(outgoing_);
for(size_t i = 0; i < incoming_.size(); ++i){
incoming_[i].type = Born_incoming[i].type;
}
assert(momentum_conserved());
}
double PhaseSpacePoint::phase_space_normalisation(
int num_Born_jets, int num_out_partons
) const{
return pow(16*pow(M_PI,3), num_Born_jets - num_out_partons);
}
bool PhaseSpacePoint::momentum_conserved() const{
fastjet::PseudoJet diff;
for(auto const & in: incoming()) diff += in.p;
const double norm = diff.E();
for(auto const & out: outgoing()) diff -= out.p;
return nearby(diff, fastjet::PseudoJet{}, norm);
}
} //namespace RHEJ
diff --git a/src/kinematics.cc b/src/kinematics.cc
index 74b0b69..689b071 100644
--- a/src/kinematics.cc
+++ b/src/kinematics.cc
@@ -1,22 +1,22 @@
#include "RHEJ/kinematics.hh"
#include "fastjet/PseudoJet.hh"
#include "RHEJ/utility.hh"
namespace RHEJ{
//reconstruct incoming momenta from momentum conservation
std::tuple<fastjet::PseudoJet, fastjet::PseudoJet> incoming_momenta(
- std::vector<Sparticle> const & outgoing
+ std::vector<Particle> const & outgoing
){
double xa(0.), xb(0.);
for(auto const & out: outgoing){
xa += out.p.e() - out.p.pz();
xb += out.p.e() + out.p.pz();
}
return std::tuple<fastjet::PseudoJet, fastjet::PseudoJet>{
{0,0,-xa/2.,xa/2.},
{0,0,xb/2.,xb/2.}
};
}
}
diff --git a/t/test_ME_h_3j.cc b/t/test_ME_h_3j.cc
index ab3a28d..fe7bc17 100644
--- a/t/test_ME_h_3j.cc
+++ b/t/test_ME_h_3j.cc
@@ -1,99 +1,99 @@
#include "LHEF/LHEF.h"
#include "RHEJ/config.hh"
#include "RHEJ/MatrixElement.hh"
#include "RHEJ/Event.hh"
struct Event{
- std::array<RHEJ::Sparticle, 2> incoming;
- std::vector<RHEJ::Sparticle> outgoing;
+ std::array<RHEJ::Particle, 2> incoming;
+ std::vector<RHEJ::Particle> outgoing;
Event(
- RHEJ::Sparticle in1, RHEJ::Sparticle in2,
- std::initializer_list<RHEJ::Sparticle> out
+ RHEJ::Particle in1, RHEJ::Particle in2,
+ std::initializer_list<RHEJ::Particle> out
):
incoming{std::move(in1), std::move(in2)},
outgoing{out}
{}
};
constexpr
RHEJ::pid::ParticleID PDG(int id){
return static_cast<RHEJ::pid::ParticleID>(id);
}
constexpr double alpha_s = 0.113559;
constexpr double mu = 125.;
constexpr double R = 0.4;
constexpr double min_jet_pt = 50.;
constexpr auto jet_def = fastjet::antikt_algorithm;
constexpr double ep = 1e-4;
void dump(Event const & ev){
LHEF::Writer writer{std::cerr};
std::cerr << std::setprecision(15);
RHEJ::UnclusteredEvent tmp;
tmp.incoming = ev.incoming;
tmp.outgoing = ev.outgoing;
tmp.central = {mu, mu, 0.};
RHEJ::Event out_ev{std::move(tmp), {jet_def, R}, min_jet_pt};
writer.hepeup = to_HEPEUP(std::move(out_ev), nullptr);
writer.writeEvent();
}
int main(){
std::vector<Event> events = {
/*
* reference matrix elements obtained from traditional HEJ (svn r3355)
* weights correspond to shat2*wt/(pdfPtr->pdfta*pdfPtr->pdftb)
* at the end of MEt2 in HJets.cxx
*/
#include "ME_test_events.dat"
};
const std::vector<double> ref_weights{
1.20840366448943e-08,3.41482815561959e-18,4.09113550770465e-12,4.62704699562129e-15,4.48439126356004e-15,1.87972263060254e-12,1.44306589954128e-14,9.10660553817556e-13,6.78185181417658e-13,2.2313219279205e-14,5.04225136522914e-10,1.15445795400542e-13,4.25305992011228e-15,6.34464495221583e-11,8.1504882635896e-09,8.13050604628519e-10,1.16718768515638e-12,2.10641257506331e-08,6.62448031524987e-23,4.3319311109536e-07,1.20944494921349e-15,5.92539274973405e-05,4.4796169513938e-17,1.49273221119393e-15,2.43311569643869e-18,2.402863950606e-12,1.0620402696538e-11,5.35907540952987e-14,1.23031328706173e-12,2.79984692016006e-15,9.15681008462036e-19,6.82192590709917e-19,7.89237067022333e-13,1.86125787460036e-14,6.46979689455398e-07,3.04911830916725e-15,8.13163686285418e-15,1.53766124466997e-14,8.32276518653951e-14,8.88400099785712e-11,8.91102728936822e-06,1.80107644544759e-15,2.10582866365414e-09,3.10947796493188e-17,3.91243813845236e-15,3.26654480787734e-17,9.5447871679842e-14,2.59793669360488e-15,4.96134344054012e-13,5.81162371703576e-14,1.111167877034e-09,2.79109572058797e-16,4.46160513513727e-16,6.75218397576417e-15,2.68260561114305e-11,4.28989454505788e-16,5.8329868340234e-16,2.2024897389957e-09,2.57397955688743e-15,2.44654345522128e-14,2.30866752912176e-14,1.41827747056589e-07,1.08893147410797e-14,4.03382910318587e-11,3.1389869623674e-10,3.90505557430021e-13,1.08295237971538e-12,7.454591488958e-15,7.54483306433453e-14,1.02908259302562e-15,5.63531574394432e-14,6.30249429292698e-11,4.53762691808614e-13,1.89024041595359e-16,6.8158270448436e-15,1.14399844221906e-12,8.90256332512462e-11,6.06548092223796e-17,9.98362270779565e-12,4.59859716748231e-15,2.15099414771066e-10,2.11591109618363e-13,4.9742178019335e-09,1.33845681137089e-10,2.71186491627684e-16,8.86739836718398e-13,1.8249669781697e-14,1.92215499935624e-13,5.63538105112205e-14,4.14171568963499e-12,2.2717979957039e-15,5.55611156772101e-15,1.28364738716082e-16,5.3851134765245e-12,1.24211103260246e-08,4.83232530709888e-17,0.000521569751168655,1.6806219324588e-15,6.59977348355555e-11,9.1627970683281e-14,2.76820118228537e-12,4.0198982918336e-11,1.48426883756103e-18,1.40114232815435e-18,1.7965991343524e-11,7.6977628175923e-10,4.62196685302415e-14,2.69246069544232e-08,1.51516950568948e-13,6.99496684443045e-13,5.18573546306991e-16,0.0434630460883225,1.9837330600509e-23,2.67017601462925e-12,9.8878856049861e-16,8.72580364190897e-11,9.78094461016429e-06,8.71781003862465e-17,1.1559862791241e-08,4.84083438123941e-11,0.0139742563571754,1.99847601444777e-13,3.04915596353023e-17,5.93151845056274e-16,2.17435618150856e-14,5.33225221812805e-08,3.87773807827851e-14,4.50810202343348e-08,1.21607462589437e-08,3.1594598104258e-13,3.28656273761685e-16,2.50210924939855e-21,2.38126296013289e-13,1.25433376653286e-11,2.14322725557091e-14,1.49146107213853e-09,1.242585653879e-15,3.55954759815053e-17,3.58323190858796e-10,4.51037144634267e-14,7.55931651143187e-09,5.37698824199559e-14,7.38868781004529e-14,1.69357650230295e-11,5.80639629823124e-10,7.4837350747944e-17,6.96956083393151e-16,1.81834207579059e-10,2.82540028744915e-12,4.0395726561383e-13,1.79694539029015e-12,1.31041890677814e-16,1.30438189219159e-07,1.43221371664219e-10,9.114047729275e-16,7.34577355123687e-09,3.22593068239571e-15,4.15681922353836e-15,3.36408379142654e-16,1.44480854726148e-11,1.01363611458694e-13,1.00219358430676e-12,0.00338137229726986,4.29548017717404e-15,2.60395354258443e-14,4.1476296627427e-14,1.06855911096978e-13,8.22439039784712e-11,2.73629652512136e-10,5.15659349602634e-11,1.01584718933351e-13,6.94380398977803e-16,2.18931000347143e-18,3.07933496617785e-09,1.66390942837878e-16,3.52525907142114e-13,3.78080647432571e-14,1.17556440172277e-12,6.59751630435329e-17,1.21755902521401e-08,2.55450721249666e-11,1.53256550428156e-14,1.08380893991568e-12,4.16098986326189e-13,2.90205083341855e-14,5.511460594056e-18,1.57699398911427e-16,7.00104401760928e-13,3.58046798793545e-12,2.01229361268661e-12,3.73614518690553e-07,2.14710426845508e-14,3.70105600162546e-13,7.98071394035332e-15,7.37834963791502e-16,1.60529982053429e-09,1.08256973923745e-12,1.0334353499219e-13,9.49543099778791e-11,1.9115591364306e-12,4.0448657562838e-16,8.71422438179998e-15,1.25631778664749e-16,3.14479096095934e-19,2.64428535684163e-16,1.12107615349188e-11,1.23625298812219e-13,4.01428912903254e-13,2.70797308155832e-11,6.56279497820654e-09,7.13734059806893e-16,0.000782868291989126,3.76614026148548e-16,1.26257000484765e-13,9.58631950869197e-13,8.31708875806124e-11,2.34133301418612e-13,9.56863619261736e-14,4.64712032868663e-12,2.86185199150703e-12,1.33576465609689e-11,1.10079981208014e-15,1.0127254462106e-12,1.1462054990501e-12,6.6945137657857e-11,5.58956247731427e-17,9.55921087729154e-12,2.34217482968982e-13,9.06915368555449e-19,5.71005344841003e-15,7.30755001164554e-09,6.21879071656432e-07,3.18226338142145e-17,7.85187718829052e-15,1.12784019414768e-13,1.26620458266236e-12,3.69177699852588e-14,5.15075992359208e-08,4.92072565553936e-15,1.85781482577606e-18,4.45444190278706e-16,1.26266755594178e-13,2.4288203970545e-16,3.05176309462854e-13,1.10490541122231e-16,8.47749453725764e-16,5.15877353528789e-11,5.24254149207253e-17,1.91355494316452e-10,5.00556344079427e-17,2.17154626918891e-15,8.84358943960976e-15,3.61414423657153e-11,4.82735747825927e-09,1.29064865560832e-13,8.42127739585314e-10,3.92906216459766e-16,6.04446459041361e-17,5.89524177334148e-12,5.46194519536606e-19,1.34088171433487e-11,5.52860041827642e-15,1.75477788501097e-15,1.73667838135065e-16,1.65397026290053e-13,1.12185521855334e-09,6.08386662697057e-17,4.59141650497559e-07,1.5209325219688e-11,2.23037744763897e-13,2.01952877105987e-13,6.8597135743949e-17,1.21998302502671e-11,3.21171910404898e-17,5.26021980482437e-15,7.19705632175135e-19,1.20963419308456e-09,6.88528237531901e-13,1.98848279147693e-11,4.01262000581642e-12,5.20247739003617e-13,1.30428205622828e-14,4.11298291694491e-13,5.52043003142038e-10,1.23093415613032e-16,7.36616975809533e-17,3.45364902177034e-16,4.34985181424009e-08,5.38804276057675e-14,9.48300760869968e-13,1.22337104642822e-09,8.35787040119371e-14,1.55423397182344e-15,1.42203125672685e-13,3.18903277676011e-13,3.88652741986258e-15,7.04896809011702e-18,1.32646740227354e-21,7.99231856556843e-13,5.95802234870006e-09,1.65149306543534e-12,1.33064116256099e-11,1.56832702886549e-12,1.10299934631458e-08,3.67898989067657e-16,7.84682358054423e-17,2.57971628718788e-09,8.33182695406546e-17,1.18568992167241e-10,1.84355449893326e-12,2.55066898328171e-13,2.83673294248314e-14,1.78606190612042e-12,3.58348766614931e-12,4.59943073492537e-16,9.51522624162865e-13,8.0286195911246e-14,1.36695977212813e-16,2.66996900743536e-13,1.18874419459462e-15,4.20697505402443e-07,1.44157427471053e-12,3.88352207261609e-12,1.10352682706254e-15,9.16382540998255e-16,1.6918487768822e-14,6.27001020277801e-13,1.19982339734628e-15,2.08524585760556e-15,3.98635216491517e-11,2.29164410091261e-16,6.59993812570474e-14,9.09720299660866e-19,1.00791143935241e-13,3.48282488442434e-15,3.82462701684145e-11,1.82912920125976e-14,2.35934504263123e-12,3.07876467756239e-11,3.01958860729077e-05,1.34442938440306e-12,1.98172170171169e-11,2.54803366934403e-14,4.63525528427102e-13,1.98623090357032e-11,1.17532063246858e-12,1.62645374532443e-16,2.23093836031326e-11,5.23718977936426e-13,6.30254161980384e-15,5.64457070654369e-16,5.8598582297477e-15,1.54121478101166e-11,2.54757492800786e-11,7.24784320481052e-13,7.10590291356503e-11,1.90012029508776e-12,5.38421849395334e-05,9.2027530054952e-13,0.00802523961864568,1.69971085315301e-12,4.17128853468654e-15,2.58531014487319e-15,6.72871249369096e-12,3.68392430578061e-16,1.56192266889718e-14,8.09758960836169e-16,1.33670176619002e-07,3.40402526854793e-10,7.14029639915786e-15,1.15907463202726e-14
};
const std::vector<double> ref_virt{
0.000407437434887122,0.0616303680115081,0.0619338272462471,0.00113600815259533,0.0611805205486735,0.000565698082480416,0.516976611025519,0.0361140019339901,0.00145895360905874,0.134071980986426,0.000248975936203567,0.199294625870235,0.24358305091454,4.74361172738652e-05,5.89666196640687e-05,0.00531027816302915,0.000200243383490462,0.0805261711344379,0.00120027603203917,0.00201705178179895,0.339181495419129,0.000229863490455131,0.0523929260778993,0.000263057002724373,0.00244241108460007,0.0261467924657004,5.9657372131903e-05,0.200512468910312,0.00810099141722299,0.013973033333956,0.0108154079325531,0.158574821336736,0.00070998197888614,0.000498608284914822,3.73054997210496e-05,0.0589374030166269,0.00230622721548646,0.0339477696166811,0.000912463632412847,0.000736710687806361,0.00409015383244036,0.245951477936874,0.0837392661445892,0.222078993106222,0.00532590926455614,0.625630979237125,0.0496003388518398,0.10116468200925,0.0661786669164834,0.0210544045965245,0.0244625178289293,0.0146510511459362,0.101257018174142,0.00316763508016474,0.00143243489499069,0.333592621341247,0.00370907687545401,0.00213872056006003,0.01900030889465,0.167144065343861,2.6100961817368e-05,4.91550277446228e-05,0.0166499896061438,0.00011398434602661,0.000359768751250008,0.00225147558163185,0.0317147645964709,0.0842595514695342,0.35407612826878,0.00010526694382132,0.0430608610020923,3.5715013356257e-05,0.000838215519554185,0.00192018265054966,0.0713712284182796,0.000485232329561933,0.00152471141515176,0.000311862603200811,0.166619420201183,0.0199021050517686,1.41779057397457e-05,0.0017318628596011,0.00053760812759845,0.0686125677803084,0.0532620439395034,0.00166666380089786,0.0113533421860016,0.000109349820296255,0.0115667016173654,0.00173679164546385,0.0256607191277514,0.00120155627964714,0.0111815333349668,0.00349052851306921,0.00531735228893806,0.00152975285273546,4.66037248418355e-05,0.0425850611539657,0.00117697776465851,1.23387751381228e-05,0.0038237470220905,0.0905644410585002,0.02820127090728,0.00024367136851271,0.147636957219027,0.000593136877076053,0.0618471045067722,9.07687985864349e-06,0.000158960279301719,0.0887358461047651,0.0332353914977947,7.4341716367417e-06,0.000892008177580303,0.000741022113249675,0.00237741099974918,0.00354813689304541,0.00074173961384706,0.00467141577324516,0.00842296482521057,0.00821661392007147,4.83792120557372e-05,0.00425252516494632,0.000432204419963046,0.00586736518573752,0.000956530707046858,0.000236851602228008,0.0892427215701044,1.38830962250345e-05,0.0080267826500828,0.284615916615109,0.000228095910528196,0.000135342214864163,7.55341699407512e-06,0.000571884401074523,0.0101768016413147,0.0171951107578717,0.00189669876455143,0.00394930354845142,0.00328294862282636,0.00123193340562429,0.00331783483858544,0.00319051646342221,0.00155129659005506,8.87358953340508e-05,0.27623170363077,0.000223827470760779,0.0568015505265356,0.000286151801691539,0.0193226057191209,0.00123755083758374,0.000465248541258071,0.0760142560624272,0.00112490607994365,0.000144842352216183,0.197405681090406,0.00129883979140284,0.0930965339402953,0.0010308437485118,0.670013359364299,0.00432667098624779,0.0454915871138651,0.00251703872973342,0.00423441033466031,0.000345157767746845,0.00161415356368555,0.00416069958683314,0.00164939718639514,0.0111406419016027,0.00655421252542946,0.00851532238518754,0.00348709627275328,0.496059905302338,0.0371917367183897,0.000211531938236732,0.000258942974591912,0.17759337052515,0.00418622722335427,0.166120697713642,0.00360502919950296,0.000407414278464457,0.0360738279541873,0.0288893174873495,0.00047259015965458,1.56547248986137e-05,0.834956154090444,0.00732703650642937,0.00474657800944094,0.00273096554923287,0.257207154892208,0.00469808491585188,0.000270576144489275,0.000136075839471612,0.097205919234904,0.000607126031374257,0.000136619984636834,0.000160087925098193,0.0073858227644151,0.538982397271589,0.00336284303209108,0.00152656630103797,0.367113302445716,7.48038626150403e-05,2.60037367946894e-05,4.68016275421979e-05,0.000158257654442151,0.000139074963089943,0.000665698879408135,0.000343142682314476,0.0686327476602143,0.000242720484154181,0.0343708294206813,0.00114889968298977,0.0586454267607763,0.0681515891243611,0.00825429790468652,0.023992046337532,0.0176721744671367,0.000118812692493978,0.152442537631382,0.017153140472422,0.0064172004743378,3.15311961394686e-05,0.0176719977165195,0.00523267370956132,0.00696013339412051,0.0283129688131134,0.000387153677372906,0.00691199037138631,0.000146275451696295,0.701230156661611,0.000192846626056869,0.000164329434653947,0.00161262788918379,0.138649850457724,0.0298984433917698,0.0318122273046375,3.04827880239274e-05,0.000447390422746664,0.00113026494701542,0.00113285595566244,2.89098339981399e-05,0.00113856357833898,0.0539144571449436,0.0708152617112735,0.000146823107858066,0.0226524231026193,0.00337461891944858,0.000951319767163979,0.00173528759879105,0.027553837556441,0.000644790987241654,0.00202675597720372,0.0904812026317863,0.000121859990107361,0.0778263959001868,0.0078676495423855,0.00106041104696191,0.0460181415526085,0.111418229601818,0.00485578450515022,0.000301615731939099,0.0991074788208953,0.000545043001929007,0.00699096247420379,0.203553031240112,0.00129391506623192,0.0163036481873179,9.84784360850182e-06,0.0011930992876943,0.000233138513444116,0.00327134762224621,0.00934510369593952,0.0257690022271133,0.0586620958023085,0.0044269686967688,0.00458204111385776,0.000575173870997244,0.0196091953126155,0.0172446254918132,0.0023874923763825,0.00203444177442346,0.00590189106361814,0.160798676736245,0.000218465854877618,0.0449130791723244,0.0221907455403962,0.00577930006864582,4.68129848124974e-05,4.39088532565896e-05,0.0957291068496414,0.000222196152405895,0.00244492299475677,0.0649283175892222,0.00246575641284538,0.00395895850035338,0.452609135498808,2.18247701431579e-05,0.000103691495491759,0.0300254483476907,0.000997825085990438,0.00120168803041095,0.000488310402876861,5.02375648302248e-05,0.0889218155230037,0.886196353445691,0.537472442381394,0.000989158503397272,0.00585452117968649,0.000166646041974894,0.0559913557856292,0.271624614149917,1.9604193016588e-05,0.00400455993655262,0.000719953658022318,0.00769221521719457,0.0122222590022294,0.00869539856191144,0.00665334452394116,0.00269456106141176,0.0203144580365219,1.06269256412071e-05,0.00266305904353431,0.000866750257077464,0.0118678506617259,0.00774140571086026,0.472668086097713,0.00449314655439557,0.000363054262255041,0.000123958362353204,0.0593128481039698,6.49758497533422e-05,0.0147733538718899,0.000181422709422017,0.124358363237549,0.0149418567595413,0.000496790567694211,0.00319609174497007,0.171371757877329,0.000132314177013318,0.000118421517677613,0.0384411149022143,0.0560023977555578,0.000545951922843868,0.00923849055867683,7.42750022847054e-05,0.0034657141222543,0.0814951536826408,0.000247436489650107,0.00279135741337402,0.128217103654628,0.000239656955359697,0.0286081920788208,0.0264861644616376,0.000700223039958121,0.000224261722502375,0.206999869456071,0.0245477336638465,0.00020080171595025,0.000534370708560753,0.00114853261836608,0.0140588914482069,0.0491695416950957,0.0219392429988939,0.000187573794241001,2.76073824918907e-05,0.0177905351398601,0.0227102533101537,0.0156338659659345,0.0045130866637909,0.0118789100672146,0.0684121072806861
};
RHEJ::MatrixElementConfig config;
config.jet_param.def = fastjet::JetDefinition(jet_def, R);
config.jet_param.min_pt = min_jet_pt;
config.log_correction = false;
config.Higgs_coupling = RHEJ::HiggsCouplingSettings{};
RHEJ::MatrixElement ME{
[](double){ return alpha_s; },
config
};
assert(events.size() == ref_weights.size());
for(size_t i = 0; i < events.size(); ++i){
std::sort(
begin(events[i].outgoing), end(events[i].outgoing),
RHEJ::rapidity_less{}
);
const double our_ME = ME.tree(
mu, events[i].incoming, events[i].outgoing, true
);
const double deviation = our_ME/ref_weights[i] - 1.;
if(std::abs(deviation) > ep){
std::cerr
<< "Matrix element deviates by factor of " << 1+deviation << ":\n"
"Is " << our_ME << ", should be " << ref_weights[i] << "\n"
"Event:\n";
dump(events[i]);
return EXIT_FAILURE;
}
const double our_virt = ME.virtual_corrections(
mu, events[i].incoming, events[i].outgoing
);
const double virt_deviation = our_virt/ref_virt[i] - 1.;
if(std::abs(virt_deviation) > ep){
std::cerr
<< "Virtual corrections deviate by factor of " << 1+virt_deviation << ":\n"
"Is " << our_virt << ", should be " << ref_virt[i] << "\n"
"Event:\n";
dump(events[i]);
return EXIT_FAILURE;
}
}
}
diff --git a/t/test_ME_hjets_mt174.cc b/t/test_ME_hjets_mt174.cc
index 45591c1..fe1cb0c 100644
--- a/t/test_ME_hjets_mt174.cc
+++ b/t/test_ME_hjets_mt174.cc
@@ -1,90 +1,90 @@
#include "LHEF/LHEF.h"
#include "RHEJ/MatrixElement.hh"
#include "RHEJ/Event.hh"
struct Event{
double weight;
- std::array<RHEJ::Sparticle, 2> incoming;
- std::vector<RHEJ::Sparticle> outgoing;
+ std::array<RHEJ::Particle, 2> incoming;
+ std::vector<RHEJ::Particle> outgoing;
Event(
double wt,
- RHEJ::Sparticle in1, RHEJ::Sparticle in2,
- std::initializer_list<RHEJ::Sparticle> out
+ RHEJ::Particle in1, RHEJ::Particle in2,
+ std::initializer_list<RHEJ::Particle> out
):
weight{wt},
incoming{std::move(in1), std::move(in2)},
outgoing{out}
{}
};
constexpr
RHEJ::pid::ParticleID PDG(int id){
return static_cast<RHEJ::pid::ParticleID>(id);
}
constexpr double alpha_s = 0.112654;
constexpr double mu = 125.;
constexpr double R = 0.4;
constexpr double min_jet_pt = 35.;
constexpr auto jet_def = fastjet::antikt_algorithm;
constexpr double ep = 1e-4;
constexpr double alpha_s_mH_RHEJ = 0.113559;
void dump(Event const & ev){
LHEF::Writer writer{std::cerr};
std::cerr << std::setprecision(15);
RHEJ::UnclusteredEvent tmp;
tmp.incoming = ev.incoming;
tmp.outgoing = ev.outgoing;
tmp.central = {mu, mu, 0.};
RHEJ::Event out_ev{std::move(tmp), {jet_def, R}, min_jet_pt};
writer.hepeup = to_HEPEUP(std::move(out_ev), nullptr);
writer.writeEvent();
}
int main(){
std::vector<Event> events = {
/*
* reference matrix elements obtained from traditional HEJ (svn r3355)
* weights correspond to shat2*wt/(pdfPtr->pdfta*pdfPtr->pdftb)
* at the end of MEt2 in HJets.cxx
*/
#include "ME_hjets_mt174.dat"
};
RHEJ::MatrixElementConfig config;
config.jet_param.def = fastjet::JetDefinition(jet_def, R);
config.jet_param.min_pt = min_jet_pt;
config.log_correction = false;
RHEJ::HiggsCouplingSettings settings;
settings.mt = 174.;
settings.use_impact_factors = false;
settings.mb = 5.;
settings.include_bottom = true;
config.Higgs_coupling = settings;
RHEJ::MatrixElement ME{
[](double){ return alpha_s; },
config
};
for(size_t i = 0; i < events.size(); ++i){
std::sort(
begin(events[i].outgoing), end(events[i].outgoing),
RHEJ::rapidity_less{}
);
const double our_ME = ME.tree(
mu, events[i].incoming, events[i].outgoing, true
);
const double deviation = our_ME/events[i].weight - 1.;
if(std::abs(deviation) > ep){
std::cerr
<< "Matrix element deviates by factor of " << 1+deviation << ":\n"
"Is " << our_ME << ", should be " << events[i].weight << "\n"
"Event:\n";
dump(events[i]);
return EXIT_FAILURE;
}
}
}

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