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diff --git a/src/Event.cc b/src/Event.cc
index 3b50745..76a21c4 100644
--- a/src/Event.cc
+++ b/src/Event.cc
@@ -1,611 +1,611 @@
#include "RHEJ/Event.hh"
#include "RHEJ/utility.hh"
#include "RHEJ/qqx.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<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, [](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, [](Particle const & s){return is_AWZH_boson(s);}
) < 2;
}
/**
* \brief function which determines if type change is consistent with W emission.
* @param in incoming Particle
* @param out outgoing Particle
*
* Ensures that change type of quark line is possible by a flavour changing
* W emission.
*/
bool is_W_Current(ParticleID in, ParticleID out){
if((in==1 && out==2)||(in==2 && out==1)){
return true;
}
else if((in==-1 && out==-2)||(in==-2 && out==-1)){
return true;
}
else if((in==3 && out==4)||(in==4 && out==3)){
return true;
}
else if((in==-3 && out==-4)||(in==-4 && out==-3)){
return true;
}
else{
return false;
}
}
/**
* \brief checks if particle type remains same from incoming to outgoing
* @param in incoming Particle
* @param out outgoing Particle
*/
bool is_Pure_Current(ParticleID in, ParticleID out){
if(abs(in)<=6 || in==21) return (in==out);
else return false;
}
// 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);
if(std::all_of(
begin_outgoing + 1, end_outgoing - 1,
[](Particle const & p){ return p.type == pid::gluon; })
){
// Test if this is a standard FKL configuration.
if (is_Pure_Current(begin_incoming->type, begin_outgoing->type)
&& is_Pure_Current((end_incoming-1)->type, (end_outgoing-1)->type)){
return true;
}
else if(is_W_Current(begin_incoming->type, begin_outgoing->type)
&& is_Pure_Current((end_incoming-1)->type, (end_outgoing-1)->type)){
return true;
}
else if(is_Pure_Current(begin_incoming->type, begin_outgoing->type)
&& is_W_Current((end_incoming-1)->type, (end_outgoing-1)->type)){
return true;
}
}
return false;
}
bool is_FKL(
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;
}
/**
* \brief Checks for a forward extremal qqx
* @param ev Event
* @returns Is the event a forward extremal qqx event
*
* Checks there is 3 or more than 3 constituents in the final state
* Checks there is 3 or more than 3 jets
* Checks most forwards incoming is gluon
* Checks most extremal particle is not a Higgs (either direction)
* Checks the second most forwards particle is not Higgs boson
* Checks the most forwards parton is a either quark or anti-quark.
* Checks the second most forwards parton is anti-quark or quark.
*/
bool is_Ex_qqxf(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)));
int fkl_end=2;
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::Higgs || out.front().type == pid::Higgs
|| out.rbegin()[1].type == pid::Higgs) return false;
// if extremal AWZ
if(is_AWZ_boson(out.back().type)){ // if extremal AWZ
fkl_end++;
if (is_quark(out.rbegin()[1].type)){ //if second quark
if (!(is_antiquark(out.rbegin()[2].type))) return false;// third must be anti-quark
} // end second quark
else if (is_antiquark(out.rbegin()[1].type)){ //if second anti-quark
if (!(is_quark(out.rbegin()[2].type))) return false;// third must be quark
}
else return false;
} // end extremal AWZ
// if extremal quark
else if (is_quark(out.rbegin()[0].type)){ //if extremal quark
if(is_AWZ_boson(out.rbegin()[1].type)){ // if second AWZ
fkl_end++;
if (!(is_antiquark(out.rbegin()[2].type))) return false;// third must be anti-quark
} //end second AWZ
else if (!(is_antiquark(out.rbegin()[1].type))) return false;// second must be anti-quark
} // end extremal quark
// if extremal anti-quark
else if (is_antiquark(out.rbegin()[0].type)){ //if extremal anti-quark
if(is_AWZ_boson(out.rbegin()[1].type)){ // if second AWZ
fkl_end++;
if (!(is_quark(out.rbegin()[2].type))) return false;// third must be quark
} //end second AWZ
else if (!(is_quark(out.rbegin()[1].type))) return false;// second must be quark
} // end extremal antiquark
// When skipping the qqbar
// New last outgoing particle must not be a Higgs
if (out.rbegin()[fkl_end].type == pid::Higgs) return false;
// Opposite current should be logical to process
if (is_AWZ_boson(out.front().type)){
return (is_Pure_Current(in.front().type, out[1].type)
|| is_W_Current(in.front().type,out[1].type));
}
else
return (is_Pure_Current(in.front().type, out[0].type)
|| is_W_Current(in.front().type,out[0].type));
}
/**
* \brief Checks for a backward extremal qqx
* @param ev Event
* @returns Is the event a backward extremal qqx event
*
* Checks there is 3 or more than 3 constituents in the final state
* Checks there is 3 or more than 3 jets
* Checks most backwards incoming is gluon
* Checks most extremal particle is not a Higgs (either direction) y
* Checks the second most backwards particle is not Higgs boson y
* Checks the most backwards parton is a either quark or anti-quark. y
* Checks the second most backwards parton is anti-quark or quark. y
*/
bool is_Ex_qqxb(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)));
int fkl_start=2;
if(out.size() < 3) return false;
if(ev.jets().size() < 3) return false;
if(in.front().type != pid::gluon) return false;
if(out.back().type == pid::Higgs || out.front().type == pid::Higgs
|| out[1].type == pid::Higgs) return false;
// if extremal AWZ
if(is_AWZ_boson(out.front().type)){ // if extremal AWZ
fkl_start++;
if (is_quark(out[1].type)){ //if second quark
if (!(is_antiquark(out[2].type))) return false;// third must be anti-quark
} // end second quark
else if (is_antiquark(out[1].type)){ //if second anti-quark
if (!(is_quark(out[2].type))) return false;// third must be quark
}
else return false;
} // end extremal AWZ
// if extremal quark
else if (is_quark(out[0].type)){ // if extremal quark
if(is_AWZ_boson(out[1].type)){ // if second AWZ
fkl_start++;
if (!(is_antiquark(out[2].type))) return false;// third must be anti-quark
} //end second AWZ
else if (!(is_antiquark(out[1].type))) return false;// second must be anti-quark
} // end extremal quark
// if extremal anti-quark
else if (is_antiquark(out[0].type)){ //if extremal anti-quark
if(is_AWZ_boson(out[1].type)){ // if second AWZ
fkl_start++;
if (!(is_quark(out[2].type))) return false;// third must be quark
} //end second AWZ
else if (!(is_quark(out[1].type))) return false;// second must be quark
} // end extremal antiquark
// When skipping the qqbar
// New last outgoing particle must not be a Higgs.
if (out[fkl_start].type == pid::Higgs) return false;
// Other current should be logical to process
if (is_AWZ_boson(out.back().type)){
return (is_Pure_Current(in.back().type, out.rbegin()[1].type)
|| is_W_Current(in.back().type,out.rbegin()[1].type));
}
else
return (is_Pure_Current(in.back().type, out.rbegin()[0].type)
|| is_W_Current(in.back().type, out.rbegin()[0].type));
}
/**
* \brief Checks for a central qqx
* @param ev Event
* @returns Is the event a central extremal qqx event
*
* Checks there is 4 or more than 4 constuents in the final state
* Checks there is 4 or more than 4 jets
* Checks most extremal particle is not a Higgs (either direction) y
* Checks for a central quark in the outgoing states
* Checks for adjacent anti-quark parton. (allowing for AWZ boson emission between)
* Checks external currents are logically sound.
*/
bool is_Mid_qqx(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() < 4) return false;
if(ev.jets().size() < 4) return false;
if(out.back().type == pid::Higgs || out.front().type == pid::Higgs) return false;
- int start_FKL=0;
- int end_FKL=0;
+ size_t start_FKL=0;
+ size_t end_FKL=0;
if (is_AWZ_boson(out.back())){
end_FKL++;
}
if (is_AWZ_boson(out.front())){
start_FKL++;
}
if ((is_Pure_Current(in.back().type,out.rbegin()[end_FKL].type)
&& is_Pure_Current(in.front().type,out[start_FKL].type))){
//nothing to do
}
else if (is_W_Current(in.back().type,out.rbegin()[end_FKL].type)
&& is_Pure_Current(in.front().type,out[start_FKL].type)){
//nothing to do
}
else if (!(is_Pure_Current(in.back().type,out.rbegin()[end_FKL].type)
&& is_W_Current(in.front().type,out[start_FKL].type))){
return false;
}
- for(auto i=1+start_FKL; i<out.size()-1-end_FKL;i++){
+ for(size_t i=1+start_FKL; i<out.size()-1-end_FKL;i++){
if (is_quark(out[i].type)){
if ((is_antiquark(out[i-1].type) && i!=1)
|| (is_antiquark(out[i+1]) && i!=out.size()-1-end_FKL)){
return true;}
else if (is_AWZ_boson(out[i-1]) && (is_antiquark(out[i-2].type) && i!=2) ){
return true;}
else if (is_AWZ_boson(out[i+1]) && (is_antiquark(out[i+2].type) && i!=out.size()-2) ){
return true;}
}
}
return false;
}
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;
}
if(is_Ex_qqxb(ev)){
return EventType::extremal_qqxb;
}
if(is_Ex_qqxf(ev)){
return EventType::extremal_qqxf;
}
if(is_Mid_qqx(ev)){
return EventType::central_qqx;
}
return EventType::nonHEJ;
}
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),
[](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](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<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(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){
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()),
[](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;
}
}

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