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diff --git a/Shower/Base/Evolver.cc b/Shower/Base/Evolver.cc
--- a/Shower/Base/Evolver.cc
+++ b/Shower/Base/Evolver.cc
@@ -1,2371 +1,2381 @@
// -*- C++ -*-
//
// Evolver.cc is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2011 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
//
// This is the implementation of the non-inlined, non-templated member
// functions of the Evolver class.
//
#include "Evolver.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Interface/Reference.h"
#include "ThePEG/Interface/RefVector.h"
#include "ThePEG/Interface/Switch.h"
#include "ThePEG/Interface/Parameter.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "Herwig++/Shower/Base/ShowerParticle.h"
#include "ThePEG/Utilities/EnumIO.h"
#include "ShowerKinematics.h"
#include "ThePEG/PDT/EnumParticles.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/Handlers/EventHandler.h"
#include "ThePEG/Utilities/Throw.h"
#include "ShowerTree.h"
#include "ShowerProgenitor.h"
#include "KinematicsReconstructor.h"
#include "PartnerFinder.h"
#include "ThePEG/Handlers/StandardXComb.h"
#include "ThePEG/PDT/DecayMode.h"
#include "Herwig++/Shower/ShowerHandler.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "ShowerVertex.h"
#include <ThePEG/Repository/CurrentGenerator.h>
using namespace Herwig;
namespace {
- /**
- * Cached lookup of decay modes.
- * Generator::findDecayMode() is not efficient.
+ /**
+ * Cached lookup of decay modes.
+ * Generator::findDecayMode() is not efficient.
*/
tDMPtr findDecayMode(const string & tag) {
static map<string,DMPtr> cache;
map<string,DMPtr>::const_iterator pos = cache.find(tag);
if ( pos != cache.end() )
return pos->second;
tDMPtr dm = CurrentGenerator::current().findDecayMode(tag);
cache[tag] = dm;
return dm;
}
}
DescribeClass<Evolver,Interfaced>
describeEvolver ("Herwig::Evolver","HwShower.so");
IBPtr Evolver::clone() const {
return new_ptr(*this);
}
IBPtr Evolver::fullclone() const {
return new_ptr(*this);
}
void Evolver::persistentOutput(PersistentOStream & os) const {
os << _model << _splittingGenerator << _maxtry
<< _meCorrMode << _hardVetoMode << _hardVetoRead << _hardVetoReadOption
- << _limitEmissions << _spinOpt
+ << _limitEmissions << _spinOpt << _softOpt
<< ounit(_iptrms,GeV) << _beta << ounit(_gamma,GeV) << ounit(_iptmax,GeV)
<< _vetoes << _trunc_Mode << _hardEmissionMode
<< _colourEvolutionMethod << _reconOpt << _hardScaleFactor
<< interaction_<< interactions_.size();
for(unsigned int ix=0;ix<interactions_.size();++ix)
os << oenum(interactions_[ix]);
}
void Evolver::persistentInput(PersistentIStream & is, int) {
unsigned int isize;
is >> _model >> _splittingGenerator >> _maxtry
>> _meCorrMode >> _hardVetoMode >> _hardVetoRead >> _hardVetoReadOption
- >> _limitEmissions >> _spinOpt
+ >> _limitEmissions >> _spinOpt >> _softOpt
>> iunit(_iptrms,GeV) >> _beta >> iunit(_gamma,GeV) >> iunit(_iptmax,GeV)
>> _vetoes >> _trunc_Mode >> _hardEmissionMode
>> _colourEvolutionMethod >> _reconOpt >> _hardScaleFactor
>> interaction_ >> isize;
interactions_.resize(isize);
for(unsigned int ix=0;ix<interactions_.size();++ix)
is >> ienum(interactions_[ix]);
}
void Evolver::doinit() {
Interfaced::doinit();
if(interaction_==0) {
interactions_.push_back(ShowerInteraction::QCD);
interactions_.push_back(ShowerInteraction::QED);
}
else if(interaction_==1) {
interactions_.push_back(ShowerInteraction::QCD);
}
else if(interaction_==2) {
interactions_.push_back(ShowerInteraction::QED);
interactions_.push_back(ShowerInteraction::QCD);
}
else if(interaction_==3) {
interactions_.push_back(ShowerInteraction::QED);
}
else if(interaction_==4) {
interactions_.push_back(ShowerInteraction::Both);
}
}
void Evolver::Init() {
static ClassDocumentation<Evolver> documentation
("This class is responsible for carrying out the showering,",
"including the kinematics reconstruction, in a given scale range,"
"including the option of the POWHEG approach to simulated next-to-leading order"
" radiation\\cite{Nason:2004rx}.",
"%\\cite{Nason:2004rx}\n"
"\\bibitem{Nason:2004rx}\n"
" P.~Nason,\n"
" ``A new method for combining NLO QCD with shower Monte Carlo algorithms,''\n"
" JHEP {\\bf 0411} (2004) 040\n"
" [arXiv:hep-ph/0409146].\n"
" %%CITATION = JHEPA,0411,040;%%\n");
static Reference<Evolver,SplittingGenerator>
interfaceSplitGen("SplittingGenerator",
"A reference to the SplittingGenerator object",
&Herwig::Evolver::_splittingGenerator,
false, false, true, false);
static Reference<Evolver,ShowerModel> interfaceShowerModel
("ShowerModel",
"The pointer to the object which defines the shower evolution model.",
&Evolver::_model, false, false, true, false, false);
static Parameter<Evolver,unsigned int> interfaceMaxTry
("MaxTry",
"The maximum number of attempts to generate the shower from a"
" particular ShowerTree",
&Evolver::_maxtry, 100, 1, 1000,
false, false, Interface::limited);
static Switch<Evolver, unsigned int> ifaceMECorrMode
("MECorrMode",
"Choice of the ME Correction Mode",
&Evolver::_meCorrMode, 1, false, false);
static SwitchOption off
(ifaceMECorrMode,"No","MECorrections off", 0);
static SwitchOption on
(ifaceMECorrMode,"Yes","hard+soft on", 1);
static SwitchOption hard
(ifaceMECorrMode,"Hard","only hard on", 2);
static SwitchOption soft
(ifaceMECorrMode,"Soft","only soft on", 3);
static Switch<Evolver, unsigned int> ifaceHardVetoMode
("HardVetoMode",
"Choice of the Hard Veto Mode",
&Evolver::_hardVetoMode, 1, false, false);
static SwitchOption HVoff
(ifaceHardVetoMode,"No","hard vetos off", 0);
static SwitchOption HVon
(ifaceHardVetoMode,"Yes","hard vetos on", 1);
static SwitchOption HVIS
(ifaceHardVetoMode,"Initial", "only IS emissions vetoed", 2);
static SwitchOption HVFS
(ifaceHardVetoMode,"Final","only FS emissions vetoed", 3);
static Switch<Evolver, unsigned int> ifaceHardVetoRead
("HardVetoScaleSource",
"If hard veto scale is to be read",
&Evolver::_hardVetoRead, 0, false, false);
static SwitchOption HVRcalc
(ifaceHardVetoRead,"Calculate","Calculate from hard process", 0);
static SwitchOption HVRread
(ifaceHardVetoRead,"Read","Read from XComb->lastScale", 1);
static Switch<Evolver, bool> ifaceHardVetoReadOption
("HardVetoReadOption",
"Apply read-in scale veto to all collisions or just the primary one?",
&Evolver::_hardVetoReadOption, false, false, false);
static SwitchOption AllCollisions
(ifaceHardVetoReadOption,
"AllCollisions",
"Read-in pT veto applied to primary and secondary collisions.",
false);
static SwitchOption PrimaryCollision
(ifaceHardVetoReadOption,
"PrimaryCollision",
"Read-in pT veto applied to primary but not secondary collisions.",
true);
static Parameter<Evolver, Energy> ifaceiptrms
("IntrinsicPtGaussian",
"RMS of intrinsic pT of Gaussian distribution:\n"
"2*(1-Beta)*exp(-sqr(intrinsicpT/RMS))/sqr(RMS)",
&Evolver::_iptrms, GeV, ZERO, ZERO, 1000000.0*GeV,
false, false, Interface::limited);
static Parameter<Evolver, double> ifacebeta
("IntrinsicPtBeta",
"Proportion of inverse quadratic distribution in generating intrinsic pT.\n"
"(1-Beta) is the proportion of Gaussian distribution",
&Evolver::_beta, 0, 0, 1,
false, false, Interface::limited);
static Parameter<Evolver, Energy> ifacegamma
("IntrinsicPtGamma",
"Parameter for inverse quadratic:\n"
"2*Beta*Gamma/(sqr(Gamma)+sqr(intrinsicpT))",
&Evolver::_gamma,GeV, ZERO, ZERO, 100000.0*GeV,
false, false, Interface::limited);
static Parameter<Evolver, Energy> ifaceiptmax
("IntrinsicPtIptmax",
"Upper bound on intrinsic pT for inverse quadratic",
&Evolver::_iptmax,GeV, ZERO, ZERO, 100000.0*GeV,
false, false, Interface::limited);
static RefVector<Evolver,ShowerVeto> ifaceVetoes
("Vetoes",
"The vetoes to be checked during showering",
&Evolver::_vetoes, -1,
false,false,true,true,false);
static Switch<Evolver,unsigned int> interfaceLimitEmissions
("LimitEmissions",
"Limit the number and type of emissions for testing",
&Evolver::_limitEmissions, 0, false, false);
static SwitchOption interfaceLimitEmissionsNoLimit
(interfaceLimitEmissions,
"NoLimit",
"Allow an arbitrary number of emissions",
0);
static SwitchOption interfaceLimitEmissionsOneInitialStateEmission
(interfaceLimitEmissions,
"OneInitialStateEmission",
"Allow one emission in the initial state and none in the final state",
1);
static SwitchOption interfaceLimitEmissionsOneFinalStateEmission
(interfaceLimitEmissions,
"OneFinalStateEmission",
"Allow one emission in the final state and none in the initial state",
2);
static SwitchOption interfaceLimitEmissionsHardOnly
(interfaceLimitEmissions,
"HardOnly",
"Only allow radiation from the hard ME correction",
3);
static SwitchOption interfaceLimitEmissionsOneEmission
(interfaceLimitEmissions,
"OneEmission",
"Allow one emission in either the final state or initial state, but not both",
4);
static Switch<Evolver,bool> interfaceTruncMode
("TruncatedShower", "Include the truncated shower?",
&Evolver::_trunc_Mode, 1, false, false);
static SwitchOption interfaceTruncMode0
(interfaceTruncMode,"No","Truncated Shower is OFF", 0);
static SwitchOption interfaceTruncMode1
(interfaceTruncMode,"Yes","Truncated Shower is ON", 1);
static Switch<Evolver,unsigned int> interfaceHardEmissionMode
("HardEmissionMode",
"Whether to use ME corrections or POWHEG for the hardest emission",
&Evolver::_hardEmissionMode, 0, false, false);
static SwitchOption interfaceHardEmissionModeMECorrection
(interfaceHardEmissionMode,
"MECorrection",
"Old fashioned ME correction",
0);
static SwitchOption interfaceHardEmissionModePOWHEG
(interfaceHardEmissionMode,
"POWHEG",
"Powheg style hard emission",
1);
static Switch<Evolver,int> interfaceColourEvolutionMethod
("ColourEvolutionMethod",
"Choice of method for choosing the colour factor in gluon evolution",
&Evolver::_colourEvolutionMethod, 0, false, false);
static SwitchOption interfaceColourEvolutionMethodDefault
(interfaceColourEvolutionMethod,
"Default",
"Colour factor is CA for all scales",
0);
static SwitchOption interfaceColourEvolutionMethodHalfCA
(interfaceColourEvolutionMethod,
"HalfCA",
"Only use half the normal radiation until second scale is reached",
1);
static Switch<Evolver,unsigned int > interfaceInteractions
("Interactions",
"The interactions to be used in the shower",
&Evolver::interaction_, 1, false, false);
static SwitchOption interfaceInteractionsQCDFirst
(interfaceInteractions,
"QCDFirst",
"QCD first then QED",
0);
static SwitchOption interfaceInteractionsQCDOnly
(interfaceInteractions,
"QCDOnly",
"Only QCD",
1);
static SwitchOption interfaceInteractionsQEDFirst
(interfaceInteractions,
"QEDFirst",
"QED first then QCD",
2);
static SwitchOption interfaceInteractionsQEDOnly
(interfaceInteractions,
"QEDOnly",
"Only QED",
3);
static SwitchOption interfaceInteractionsBothAtOnce
(interfaceInteractions,
"BothAtOnce",
"Generate both at the same time",
4);
static Switch<Evolver,unsigned int> interfaceReconstructionOption
("ReconstructionOption",
"Treatment of the reconstruction of the transverse momentum of "
"a branching from the evolution scale.",
&Evolver::_reconOpt, 0, false, false);
static SwitchOption interfaceReconstructionOptionCutOff
(interfaceReconstructionOption,
"CutOff",
"Use the cut-off masses in the calculation",
0);
static SwitchOption interfaceReconstructionOptionOffShell
(interfaceReconstructionOption,
"OffShell",
"Use the off-shell masses in the calculation",
1);
static Parameter<Evolver,double> interfaceHardScaleFactor
("HardScaleFactor",
"Set the factor to multiply the hard veto scale.",
&Evolver::_hardScaleFactor, 1.0, 0.0, 0,
false, false, Interface::lowerlim);
static Switch<Evolver,unsigned int> interfaceSpinCorrelations
("SpinCorrelations",
"Treatment of spin correlations in the parton shower",
&Evolver::_spinOpt, 0, false, false);
static SwitchOption interfaceSpinCorrelationsOff
(interfaceSpinCorrelations,
- "Off",
+ "No",
"No spin correlations",
0);
static SwitchOption interfaceSpinCorrelationsSpin
(interfaceSpinCorrelations,
- "Spin",
+ "Yes",
"Include the azimuthal spin correlations only",
1);
- static SwitchOption interfaceSpinCorrelationsSoft
- (interfaceSpinCorrelations,
- "Soft",
- "Include the soft correlations inside the cone only",
+
+ static Switch<Evolver,unsigned int> interfaceSoftCorrelations
+ ("SoftCorrelations",
+ "Option for the treatment of soft correlations in the parton shower",
+ &Evolver::_softOpt, 0, false, false);
+ static SwitchOption interfaceSoftCorrelationsNone
+ (interfaceSoftCorrelations,
+ "No",
+ "No soft correlations",
+ 1);
+ static SwitchOption interfaceSoftCorrelationsFull
+ (interfaceSoftCorrelations,
+ "Full",
+ "Use the full eikonal",
+ 1);
+ static SwitchOption interfaceSoftCorrelationsSingular
+ (interfaceSoftCorrelations,
+ "Singular",
+ "Use original Webber-Marchisini form",
2);
- static SwitchOption interfaceSpinCorrelationsBoth
- (interfaceSpinCorrelations,
- "Both",
- "Include both spin and soft correlations",
- 3);
}
void Evolver::generateIntrinsicpT(vector<ShowerProgenitorPtr> particlesToShower) {
_intrinsic.clear();
if ( !ipTon() || !isISRadiationON() ) return;
// don't do anything for the moment for secondary scatters
if( !ShowerHandler::currentHandler()->firstInteraction() ) return;
// generate intrinsic pT
for(unsigned int ix=0;ix<particlesToShower.size();++ix) {
// only consider initial-state particles
if(particlesToShower[ix]->progenitor()->isFinalState()) continue;
if(!particlesToShower[ix]->progenitor()->dataPtr()->coloured()) continue;
Energy ipt;
if(UseRandom::rnd() > _beta) {
ipt=_iptrms*sqrt(-log(UseRandom::rnd()));
}
else {
ipt=_gamma*sqrt(pow(1.+sqr(_iptmax/_gamma), UseRandom::rnd())-1.);
}
pair<Energy,double> pt = make_pair(ipt,UseRandom::rnd(Constants::twopi));
_intrinsic[particlesToShower[ix]] = pt;
}
}
void Evolver::setupMaximumScales(const vector<ShowerProgenitorPtr> & p,
XCPtr xcomb) {
// let POWHEG events radiate freely
if(_hardEmissionMode==1&&hardTree()) {
vector<ShowerProgenitorPtr>::const_iterator ckt = p.begin();
for (; ckt != p.end(); ckt++) (*ckt)->maxHardPt(Constants::MaxEnergy);
return;
}
// return if no vetos
if (!hardVetoOn()) return;
// find out if hard partonic subprocess.
bool isPartonic(false);
map<ShowerProgenitorPtr,ShowerParticlePtr>::const_iterator
cit = _currenttree->incomingLines().begin();
Lorentz5Momentum pcm;
for(; cit!=currentTree()->incomingLines().end(); ++cit) {
pcm += cit->first->progenitor()->momentum();
isPartonic |= cit->first->progenitor()->coloured();
}
// find maximum pt from hard process, the maximum pt from all outgoing
// coloured lines (this is simpler and more general than
// 2stu/(s^2+t^2+u^2)). Maximum scale for scattering processes will
// be transverse mass.
Energy ptmax = -1.0*GeV;
// general case calculate the scale
if (!hardVetoXComb()||
(hardVetoReadOption()&&
!ShowerHandler::currentHandler()->firstInteraction())) {
// scattering process
if(currentTree()->isHard()) {
assert(xcomb);
// coloured incoming particles
if (isPartonic) {
map<ShowerProgenitorPtr,tShowerParticlePtr>::const_iterator
cjt = currentTree()->outgoingLines().begin();
for(; cjt!=currentTree()->outgoingLines().end(); ++cjt) {
if (cjt->first->progenitor()->coloured())
ptmax = max(ptmax,cjt->first->progenitor()->momentum().mt());
}
}
if (ptmax < ZERO) ptmax = pcm.m();
if(hardVetoXComb()&&hardVetoReadOption()&&
!ShowerHandler::currentHandler()->firstInteraction()) {
ptmax=min(ptmax,sqrt(xcomb->lastScale()));
}
}
// decay, incoming() is the decaying particle.
else {
ptmax = currentTree()->incomingLines().begin()->first
->progenitor()->momentum().mass();
}
}
// hepeup.SCALUP is written into the lastXComb by the
// LesHouchesReader itself - use this by user's choice.
// Can be more general than this.
else {
if(currentTree()->isHard()) {
assert(xcomb);
ptmax = sqrt( xcomb->lastScale() );
}
else {
ptmax = currentTree()->incomingLines().begin()->first
->progenitor()->momentum().mass();
}
}
ptmax *= hardScaleFactor();
// set maxHardPt for all progenitors. For partonic processes this
// is now the max pt in the FS, for non-partonic processes or
// processes with no coloured FS the invariant mass of the IS
vector<ShowerProgenitorPtr>::const_iterator ckt = p.begin();
for (; ckt != p.end(); ckt++) (*ckt)->maxHardPt(ptmax);
}
void Evolver::showerHardProcess(ShowerTreePtr hard, XCPtr xcomb) {
_hardme = HwMEBasePtr();
// extract the matrix element
tStdXCombPtr lastXC = dynamic_ptr_cast<tStdXCombPtr>(xcomb);
if(lastXC) {
_hardme = dynamic_ptr_cast<HwMEBasePtr>(lastXC->matrixElement());
}
_decayme = HwDecayerBasePtr();
// set the current tree
currentTree(hard);
hardTree(HardTreePtr());
// number of attempts if more than one interaction switched on
unsigned int interactionTry=0;
do {
try {
// generate the showering
doShowering(true,xcomb);
// if no vetos return
return;
}
catch (InteractionVeto) {
currentTree()->clear();
++interactionTry;
}
}
while(interactionTry<=5);
throw Exception() << "Too many tries for shower in "
<< "Evolver::showerHardProcess()"
<< Exception::eventerror;
}
void Evolver::hardMatrixElementCorrection(bool hard) {
// set the initial enhancement factors for the soft correction
_initialenhance = 1.;
_finalenhance = 1.;
// if hard matrix element switched off return
if(!MECOn()) return;
// see if we can get the correction from the matrix element
// or decayer
if(hard) {
if(_hardme&&_hardme->hasMECorrection()) {
_hardme->initializeMECorrection(_currenttree,
_initialenhance,_finalenhance);
if(hardMEC())
_hardme->applyHardMatrixElementCorrection(_currenttree);
}
}
else {
if(_decayme&&_decayme->hasMECorrection()) {
_decayme->initializeMECorrection(_currenttree,
_initialenhance,_finalenhance);
if(hardMEC())
_decayme->applyHardMatrixElementCorrection(_currenttree);
}
}
}
bool Evolver::timeLikeShower(tShowerParticlePtr particle,
ShowerInteraction::Type type,
bool first) {
// don't do anything if not needed
if(_limitEmissions == 1 || hardOnly() ||
( _limitEmissions == 2 && _nfs != 0) ||
( _limitEmissions == 4 && _nfs + _nis != 0) ) {
if(particle->spinInfo()) particle->spinInfo()->develop();
return false;
}
ShowerParticleVector theChildren;
int ntry=0;
do {
++ntry;
// generate the emission
Branching fb;
while (true) {
fb=_splittingGenerator->chooseForwardBranching(*particle,_finalenhance,type);
// no emission return
if(!fb.kinematics) {
if(particle->spinInfo()) particle->spinInfo()->develop();
return false;
}
// if emission OK break
if(!timeLikeVetoed(fb,particle)) break;
// otherwise reset scale and continue - SO IS involved in veto algorithm
particle->vetoEmission(fb.type,fb.kinematics->scale());
if(particle->spinInfo()) particle->spinInfo()->decayVertex(VertexPtr());
}
// has emitted
// Assign the shower kinematics to the emitting particle.
particle->showerKinematics(fb.kinematics);
// Assign the splitting function to the emitting particle.
// For the time being we are considering only 1->2 branching
// Create the ShowerParticle objects for the two children of
// the emitting particle; set the parent/child relationship
// if same as definition create particles, otherwise create cc
tcPDPtr pdata[2];
for(unsigned int ix=0;ix<2;++ix) pdata[ix]=getParticleData(fb.ids[ix+1]);
if(particle->id()!=fb.ids[0]) {
for(unsigned int ix=0;ix<2;++ix) {
tPDPtr cc(pdata[ix]->CC());
if(cc) pdata[ix]=cc;
}
}
theChildren.push_back(new_ptr(ShowerParticle(pdata[0],true)));
theChildren.push_back(new_ptr(ShowerParticle(pdata[1],true)));
// update the children
particle->showerKinematics()->
updateChildren(particle, theChildren,fb.type);
// update number of emissions
++_nfs;
if(_limitEmissions!=0) {
theChildren[0]->spinInfo()->develop();
theChildren[1]->spinInfo()->develop();
if(particle->spinInfo()) particle->spinInfo()->develop();
return true;
}
// shower the first particle
timeLikeShower(theChildren[0],type,false);
if(theChildren[0]->spinInfo()) theChildren[0]->spinInfo()->develop();
// shower the second particle
timeLikeShower(theChildren[1],type,false);
if(theChildren[1]->spinInfo()) theChildren[1]->spinInfo()->develop();
// that's if for old approach
if(_reconOpt==0) break;
// branching has happened
particle->showerKinematics()->
updateParent(particle, theChildren,fb.type);
// clean up the vetoed emission
if(particle->virtualMass()==ZERO) {
particle->showerKinematics(ShoKinPtr());
for(unsigned int ix=0;ix<theChildren.size();++ix)
particle->abandonChild(theChildren[ix]);
theChildren.clear();
}
}
while(particle->virtualMass()==ZERO&&ntry<50);
if(first)
particle->showerKinematics()->resetChildren(particle,theChildren);
if(particle->spinInfo()) particle->spinInfo()->develop();
return true;
}
bool
Evolver::spaceLikeShower(tShowerParticlePtr particle, PPtr beam,
ShowerInteraction::Type type) {
//using the pdf's associated with the ShowerHandler assures, that
//modified pdf's are used for the secondary interactions via
//CascadeHandler::resetPDFs(...)
tcPDFPtr pdf;
if(ShowerHandler::currentHandler()->firstPDF().particle() == _beam)
pdf = ShowerHandler::currentHandler()->firstPDF().pdf();
if(ShowerHandler::currentHandler()->secondPDF().particle() == _beam)
pdf = ShowerHandler::currentHandler()->secondPDF().pdf();
Energy freeze = ShowerHandler::currentHandler()->pdfFreezingScale();
// don't do anything if not needed
if(_limitEmissions == 2 || hardOnly() ||
( _limitEmissions == 1 && _nis != 0 ) ||
( _limitEmissions == 4 && _nis + _nfs != 0 ) ) {
if(particle->spinInfo()) particle->spinInfo()->develop();
return false;
}
Branching bb;
// generate branching
while (true) {
bb=_splittingGenerator->chooseBackwardBranching(*particle,beam,
_initialenhance,
_beam,type,
pdf,freeze);
// return if no emission
if(!bb.kinematics) {
if(particle->spinInfo()) particle->spinInfo()->develop();
return false;
}
// if not vetoed break
if(!spaceLikeVetoed(bb,particle)) break;
// otherwise reset scale and continue
particle->vetoEmission(bb.type,bb.kinematics->scale());
if(particle->spinInfo()) particle->spinInfo()->decayVertex(VertexPtr());
}
// assign the splitting function and shower kinematics
particle->showerKinematics(bb.kinematics);
// For the time being we are considering only 1->2 branching
// particles as in Sudakov form factor
tcPDPtr part[2]={getParticleData(bb.ids[0]),
getParticleData(bb.ids[2])};
if(particle->id()!=bb.ids[1]) {
if(part[0]->CC()) part[0]=part[0]->CC();
if(part[1]->CC()) part[1]=part[1]->CC();
}
// Now create the actual particles, make the otherChild a final state
// particle, while the newParent is not
ShowerParticlePtr newParent=new_ptr(ShowerParticle(part[0],false));
ShowerParticlePtr otherChild = new_ptr(ShowerParticle(part[1],true,true));
ShowerParticleVector theChildren;
theChildren.push_back(particle);
theChildren.push_back(otherChild);
//this updates the evolution scale
particle->showerKinematics()->
updateParent(newParent, theChildren,bb.type);
// update the history if needed
_currenttree->updateInitialStateShowerProduct(_progenitor,newParent);
_currenttree->addInitialStateBranching(particle,newParent,otherChild);
// for the reconstruction of kinematics, parent/child
// relationships are according to the branching process:
// now continue the shower
++_nis;
bool emitted = _limitEmissions==0 ?
spaceLikeShower(newParent,beam,type) : false;
if(newParent->spinInfo()) newParent->spinInfo()->develop();
// now reconstruct the momentum
if(!emitted) {
if(_intrinsic.find(_progenitor)==_intrinsic.end()) {
bb.kinematics->updateLast(newParent,ZERO,ZERO);
}
else {
pair<Energy,double> kt=_intrinsic[_progenitor];
bb.kinematics->updateLast(newParent,
kt.first*cos(kt.second),
kt.first*sin(kt.second));
}
}
particle->showerKinematics()->
updateChildren(newParent, theChildren,bb.type);
if(_limitEmissions!=0) {
if(particle->spinInfo()) particle->spinInfo()->develop();
return true;
}
// perform the shower of the final-state particle
timeLikeShower(otherChild,type,true);
if(theChildren[1]->spinInfo()) theChildren[1]->spinInfo()->develop();
// return the emitted
if(particle->spinInfo()) particle->spinInfo()->develop();
return true;
}
void Evolver::showerDecay(ShowerTreePtr decay) {
_decayme = HwDecayerBasePtr();
_hardme = HwMEBasePtr();
// find the decayer
// try the normal way if possible
tDMPtr dm = decay->incomingLines().begin()->first->original() ->decayMode();
if(!dm) dm = decay->incomingLines().begin()->first->copy() ->decayMode();
if(!dm) dm = decay->incomingLines().begin()->first->progenitor()->decayMode();
// otherwise make a string and look it up
if(!dm) {
string tag = decay->incomingLines().begin()->first->original()->dataPtr()->name()
+ "->";
for(map<ShowerProgenitorPtr,tShowerParticlePtr>::const_iterator
it=decay->outgoingLines().begin();it!=decay->outgoingLines().end();++it) {
if(it!=decay->outgoingLines().begin()) tag += ",";
tag += it->first->original()->dataPtr()->name();
}
tag += ";";
dm = findDecayMode(tag);
}
if(dm) _decayme = dynamic_ptr_cast<HwDecayerBasePtr>(dm->decayer());
// set the ShowerTree to be showered
currentTree(decay);
decay->applyTransforms();
hardTree(HardTreePtr());
unsigned int interactionTry=0;
do {
try {
// generate the showering
doShowering(false,XCPtr());
// if no vetos
// force calculation of spin correlations
SpinPtr spInfo = decay->incomingLines().begin()->first->progenitor()->spinInfo();
if(spInfo) {
if(!spInfo->developed()) spInfo->needsUpdate();
spInfo->develop();
}
// and then return
return;
}
catch (InteractionVeto) {
currentTree()->clear();
++interactionTry;
}
}
while(interactionTry<=5);
throw Exception() << "Too many tries for QED shower in Evolver::showerDecay()"
<< Exception::eventerror;
}
bool Evolver::spaceLikeDecayShower(tShowerParticlePtr particle,
const ShowerParticle::EvolutionScales & maxScales,
Energy minmass,ShowerInteraction::Type type) {
Branching fb;
while (true) {
fb=_splittingGenerator->chooseDecayBranching(*particle,maxScales,minmass,
_initialenhance,type);
// return if no radiation
if(!fb.kinematics) return false;
// if not vetoed break
if(!spaceLikeDecayVetoed(fb,particle)) break;
// otherwise reset scale and continue
particle->vetoEmission(fb.type,fb.kinematics->scale());
}
// has emitted
// Assign the shower kinematics to the emitting particle.
particle->showerKinematics(fb.kinematics);
// For the time being we are considering only 1->2 branching
// Create the ShowerParticle objects for the two children of
// the emitting particle; set the parent/child relationship
// if same as definition create particles, otherwise create cc
tcPDPtr pdata[2];
for(unsigned int ix=0;ix<2;++ix) pdata[ix]=getParticleData(fb.ids[ix+1]);
if(particle->id()!=fb.ids[0]) {
for(unsigned int ix=0;ix<2;++ix) {
tPDPtr cc(pdata[ix]->CC());
if(cc) pdata[ix]=cc;
}
}
ShowerParticleVector theChildren;
theChildren.push_back(new_ptr(ShowerParticle(pdata[0],true)));
theChildren.push_back(new_ptr(ShowerParticle(pdata[1],true)));
// some code moved to updateChildren
particle->showerKinematics()->
updateChildren(particle, theChildren, fb.type);
// In the case of splittings which involves coloured particles,
// set properly the colour flow of the branching.
// update the history if needed
_currenttree->updateInitialStateShowerProduct(_progenitor,theChildren[0]);
_currenttree->addInitialStateBranching(particle,theChildren[0],theChildren[1]);
// shower the first particle
spaceLikeDecayShower(theChildren[0],maxScales,minmass,type);
// shower the second particle
timeLikeShower(theChildren[1],type,true);
// branching has happened
return true;
}
vector<ShowerProgenitorPtr> Evolver::setupShower(bool hard) {
// generate POWHEG hard emission if needed
if(_hardEmissionMode==1) hardestEmission(hard);
ShowerInteraction::Type inter = interactions_[0];
if(_hardtree&&inter!=ShowerInteraction::Both) {
inter = _hardtree->interaction();
}
// set the initial colour partners
setEvolutionPartners(hard,inter,false);
// generate hard me if needed
if(_hardEmissionMode==0) hardMatrixElementCorrection(hard);
// get the particles to be showered
vector<ShowerProgenitorPtr> particlesToShower =
currentTree()->extractProgenitors();
// remake the colour partners if needed
if(_hardEmissionMode==0 && _currenttree->hardMatrixElementCorrection()) {
setEvolutionPartners(hard,interactions_[0],true);
_currenttree->resetShowerProducts();
}
// return the answer
return particlesToShower;
}
void Evolver::setEvolutionPartners(bool hard,ShowerInteraction::Type type,
bool clear) {
// match the particles in the ShowerTree and hardTree
if(hardTree() && !hardTree()->connect(currentTree()))
throw Exception() << "Can't match trees in "
<< "Evolver::setEvolutionPartners()"
<< Exception::eventerror;
// extract the progenitors
vector<ShowerParticlePtr> particles =
currentTree()->extractProgenitorParticles();
// clear the partners if needed
if(clear) {
for(unsigned int ix=0;ix<particles.size();++ix) {
particles[ix]->partner(ShowerParticlePtr());
particles[ix]->clearPartners();
}
}
// sort out the colour partners
if(hardTree()) {
// find the partner
for(unsigned int ix=0;ix<particles.size();++ix) {
tHardBranchingPtr partner =
hardTree()->particles()[particles[ix]]->colourPartner();
if(!partner) continue;
for(map<ShowerParticlePtr,tHardBranchingPtr>::const_iterator
it=hardTree()->particles().begin();
it!=hardTree()->particles().end();++it) {
if(it->second==partner) particles[ix]->partner(it->first);
}
if(!particles[ix]->partner())
throw Exception() << "Can't match partners in "
<< "Evolver::setEvolutionPartners()"
<< Exception::eventerror;
}
}
// Set the initial evolution scales
showerModel()->partnerFinder()->
setInitialEvolutionScales(particles,!hard,type,!_hardtree);
}
void Evolver::updateHistory(tShowerParticlePtr particle) {
if(!particle->children().empty()) {
ShowerParticleVector theChildren;
for(unsigned int ix=0;ix<particle->children().size();++ix) {
ShowerParticlePtr part = dynamic_ptr_cast<ShowerParticlePtr>
(particle->children()[ix]);
theChildren.push_back(part);
}
// update the history if needed
if(particle==_currenttree->getFinalStateShowerProduct(_progenitor))
_currenttree->updateFinalStateShowerProduct(_progenitor,
particle,theChildren);
_currenttree->addFinalStateBranching(particle,theChildren);
for(unsigned int ix=0;ix<theChildren.size();++ix)
updateHistory(theChildren[ix]);
}
}
bool Evolver::startTimeLikeShower(ShowerInteraction::Type type) {
if(hardTree()) {
map<ShowerParticlePtr,tHardBranchingPtr>::const_iterator
eit=hardTree()->particles().end(),
mit = hardTree()->particles().find(progenitor()->progenitor());
if( mit != eit && !mit->second->children().empty() ) {
bool output=truncatedTimeLikeShower(progenitor()->progenitor(),
mit->second ,type);
if(output) updateHistory(progenitor()->progenitor());
return output;
}
}
bool output = hardOnly() ? false :
timeLikeShower(progenitor()->progenitor() ,type,true) ;
if(output) updateHistory(progenitor()->progenitor());
return output;
}
bool Evolver::startSpaceLikeShower(PPtr parent, ShowerInteraction::Type type) {
if(hardTree()) {
map<ShowerParticlePtr,tHardBranchingPtr>::const_iterator
eit =hardTree()->particles().end(),
mit = hardTree()->particles().find(progenitor()->progenitor());
if( mit != eit && mit->second->parent() ) {
return truncatedSpaceLikeShower( progenitor()->progenitor(),
parent, mit->second->parent(), type );
}
}
return hardOnly() ? false :
spaceLikeShower(progenitor()->progenitor(),parent,type);
}
bool Evolver::
startSpaceLikeDecayShower(const ShowerParticle::EvolutionScales & maxScales,
Energy minimumMass,ShowerInteraction::Type type) {
if(hardTree()) {
map<ShowerParticlePtr,tHardBranchingPtr>::const_iterator
eit =hardTree()->particles().end(),
mit = hardTree()->particles().find(progenitor()->progenitor());
if( mit != eit && mit->second->parent() ) {
HardBranchingPtr branch=mit->second;
while(branch->parent()) branch=branch->parent();
return truncatedSpaceLikeDecayShower(progenitor()->progenitor(),maxScales,
minimumMass, branch ,type);
}
}
return hardOnly() ? false :
spaceLikeDecayShower(progenitor()->progenitor(),maxScales,minimumMass,type);
}
bool Evolver::timeLikeVetoed(const Branching & fb,
ShowerParticlePtr particle) {
// work out type of interaction
ShowerInteraction::Type type = fb.type==ShowerPartnerType::QED ?
ShowerInteraction::QED : ShowerInteraction::QCD;
// check whether emission was harder than largest pt of hard subprocess
if ( hardVetoFS() && fb.kinematics->pT() > _progenitor->maxHardPt() )
return true;
// soft matrix element correction veto
if( softMEC()) {
if(_hardme && _hardme->hasMECorrection()) {
if(_hardme->softMatrixElementVeto(_progenitor,particle,fb))
return true;
}
else if(_decayme && _decayme->hasMECorrection()) {
if(_decayme->softMatrixElementVeto(_progenitor,particle,fb))
return true;
}
}
// veto on maximum pt
if(fb.kinematics->pT()>_progenitor->maximumpT(type)) return true;
// general vetos
if (fb.kinematics && !_vetoes.empty()) {
bool vetoed=false;
for (vector<ShowerVetoPtr>::iterator v = _vetoes.begin();
v != _vetoes.end(); ++v) {
bool test = (**v).vetoTimeLike(_progenitor,particle,fb);
switch((**v).vetoType()) {
case ShowerVeto::Emission:
vetoed |= test;
break;
case ShowerVeto::Shower:
if(test) throw VetoShower();
break;
case ShowerVeto::Event:
if(test) throw Veto();
break;
}
}
if(vetoed) return true;
}
return false;
}
bool Evolver::spaceLikeVetoed(const Branching & bb,
ShowerParticlePtr particle) {
// work out type of interaction
ShowerInteraction::Type type = bb.type==ShowerPartnerType::QED ?
ShowerInteraction::QED : ShowerInteraction::QCD;
// check whether emission was harder than largest pt of hard subprocess
if (hardVetoIS() && bb.kinematics->pT() > _progenitor->maxHardPt())
return true;
// apply the soft correction
if( softMEC() && _hardme && _hardme->hasMECorrection() ) {
if(_hardme->softMatrixElementVeto(_progenitor,particle,bb))
return true;
}
// the more general vetos
// check vs max pt for the shower
if(bb.kinematics->pT()>_progenitor->maximumpT(type)) return true;
if (!_vetoes.empty()) {
bool vetoed=false;
for (vector<ShowerVetoPtr>::iterator v = _vetoes.begin();
v != _vetoes.end(); ++v) {
bool test = (**v).vetoSpaceLike(_progenitor,particle,bb);
switch ((**v).vetoType()) {
case ShowerVeto::Emission:
vetoed |= test;
break;
case ShowerVeto::Shower:
if(test) throw VetoShower();
break;
case ShowerVeto::Event:
if(test) throw Veto();
break;
}
}
if (vetoed) return true;
}
return false;
}
bool Evolver::spaceLikeDecayVetoed( const Branching & fb,
ShowerParticlePtr particle) {
// work out type of interaction
ShowerInteraction::Type type = fb.type==ShowerPartnerType::QED ?
ShowerInteraction::QED : ShowerInteraction::QCD;
// apply the soft correction
if( softMEC() && _decayme && _decayme->hasMECorrection() ) {
if(_decayme->softMatrixElementVeto(_progenitor,particle,fb))
return true;
}
// veto on hardest pt in the shower
if(fb.kinematics->pT()> _progenitor->maximumpT(type)) return true;
// general vetos
if (!_vetoes.empty()) {
bool vetoed=false;
for (vector<ShowerVetoPtr>::iterator v = _vetoes.begin();
v != _vetoes.end(); ++v) {
bool test = (**v).vetoSpaceLike(_progenitor,particle,fb);
switch((**v).vetoType()) {
case ShowerVeto::Emission:
vetoed |= test;
break;
case ShowerVeto::Shower:
if(test) throw VetoShower();
break;
case ShowerVeto::Event:
if(test) throw Veto();
break;
}
if (vetoed) return true;
}
}
return false;
}
void Evolver::hardestEmission(bool hard) {
HardTreePtr ISRTree;
if( ( _hardme && _hardme->hasPOWHEGCorrection()!=0) ||
( _decayme && _decayme->hasPOWHEGCorrection()!=0)) {
if(_hardme) {
assert(hard);
if(interaction_==4) {
vector<ShowerInteraction::Type> inter(2);
inter[0] = ShowerInteraction::QCD;
inter[1] = ShowerInteraction::QED;
_hardtree = _hardme->generateHardest( currentTree(),inter );
}
else {
_hardtree = _hardme->generateHardest( currentTree(),interactions_ );
}
}
else {
assert(!hard);
_hardtree = _decayme->generateHardest( currentTree() );
}
// store initial state POWHEG radiation
if(_hardtree && _hardme && _hardme->hasPOWHEGCorrection()==1)
ISRTree=_hardtree;
}
else {
_hardtree = ShowerHandler::currentHandler()->generateCKKW(currentTree());
}
// if hard me doesn't have a FSR powheg
// correction use decay powheg correction
if (_hardme && _hardme->hasPOWHEGCorrection()<2) {
// check for intermediate colour singlet resonance
const ParticleVector inter = _hardme->subProcess()->intermediates();
if (inter.size()!=1 ||
inter[0]->momentum().m2()/GeV2 < 0 ||
inter[0]->dataPtr()->iColour()!=PDT::Colour0){
if(_hardtree) connectTrees(currentTree(),_hardtree,hard);
return;
}
map<ShowerProgenitorPtr, tShowerParticlePtr > out = currentTree()->outgoingLines();
// ignore cases where outgoing particles are not coloured
if (out.size()!=2 ||
out. begin()->second->dataPtr()->iColour()==PDT::Colour0 ||
out.rbegin()->second->dataPtr()->iColour()==PDT::Colour0) {
if(_hardtree) connectTrees(currentTree(),_hardtree,hard);
return;
}
// look up decay mode
tDMPtr dm;
string tag;
string inParticle = inter[0]->dataPtr()->name() + "->";
vector<string> outParticles;
outParticles.push_back(out.begin ()->first->progenitor()->dataPtr()->name());
outParticles.push_back(out.rbegin()->first->progenitor()->dataPtr()->name());
for (int it=0; it<2; ++it){
tag = inParticle + outParticles[it] + "," + outParticles[(it+1)%2] + ";";
dm = generator()->findDecayMode(tag);
if(dm) break;
}
// get the decayer
HwDecayerBasePtr decayer;
if(dm) decayer = dynamic_ptr_cast<HwDecayerBasePtr>(dm->decayer());
// check if decayer has a FSR POWHEG correction
if (!decayer || decayer->hasPOWHEGCorrection()<2){
if(_hardtree) connectTrees(currentTree(),_hardtree,hard);
return;
}
// generate the hardest emission
ShowerDecayMap decay;
PPtr in = new_ptr(*inter[0]);
ShowerTreePtr decayTree = new_ptr(ShowerTree(in, decay));
HardTreePtr FSRTree = decayer->generateHardest(decayTree);
if (!FSRTree) {
if(_hardtree) connectTrees(currentTree(),_hardtree,hard);
return;
}
// if there is no ISRTree make _hardtree from FSRTree
if (!ISRTree){
vector<HardBranchingPtr> inBranch,hardBranch;
for(map<ShowerProgenitorPtr,ShowerParticlePtr>::const_iterator
cit =currentTree()->incomingLines().begin();
cit!=currentTree()->incomingLines().end();++cit ) {
inBranch.push_back(new_ptr(HardBranching(cit->second,SudakovPtr(),
HardBranchingPtr(),
HardBranching::Incoming)));
inBranch.back()->beam(cit->first->original()->parents()[0]);
hardBranch.push_back(inBranch.back());
}
if(inBranch[0]->branchingParticle()->dataPtr()->coloured()) {
inBranch[0]->colourPartner(inBranch[1]);
inBranch[1]->colourPartner(inBranch[0]);
}
for(set<HardBranchingPtr>::iterator it=FSRTree->branchings().begin();
it!=FSRTree->branchings().end();++it) {
if((**it).branchingParticle()->id()!=in->id())
hardBranch.push_back(*it);
}
hardBranch[2]->colourPartner(hardBranch[3]);
hardBranch[3]->colourPartner(hardBranch[2]);
HardTreePtr newTree = new_ptr(HardTree(hardBranch,inBranch,
ShowerInteraction::QCD));
_hardtree = newTree;
}
// Otherwise modify the ISRTree to include the emission in FSRTree
else {
vector<tShowerParticlePtr> FSROut, ISROut;
set<HardBranchingPtr>::iterator itFSR, itISR;
// get outgoing particles
for(itFSR =FSRTree->branchings().begin();
itFSR!=FSRTree->branchings().end();++itFSR){
if ((**itFSR).status()==HardBranching::Outgoing)
FSROut.push_back((*itFSR)->branchingParticle());
}
for(itISR =ISRTree->branchings().begin();
itISR!=ISRTree->branchings().end();++itISR){
if ((**itISR).status()==HardBranching::Outgoing)
ISROut.push_back((*itISR)->branchingParticle());
}
// find COM frame formed by outgoing particles
LorentzRotation eventFrameFSR, eventFrameISR;
eventFrameFSR = ((FSROut[0]->momentum()+FSROut[1]->momentum()).findBoostToCM());
eventFrameISR = ((ISROut[0]->momentum()+ISROut[1]->momentum()).findBoostToCM());
// find rotation between ISR and FSR frames
int j=0;
if (ISROut[0]->id()!=FSROut[0]->id()) j=1;
eventFrameISR.rotateZ( (eventFrameFSR*FSROut[0]->momentum()).phi()-
(eventFrameISR*ISROut[j]->momentum()).phi() );
eventFrameISR.rotateY( (eventFrameFSR*FSROut[0]->momentum()).theta()-
(eventFrameISR*ISROut[j]->momentum()).theta() );
eventFrameISR.invert();
for (itFSR=FSRTree->branchings().begin();
itFSR!=FSRTree->branchings().end();++itFSR){
if ((**itFSR).branchingParticle()->id()==in->id()) continue;
for (itISR =ISRTree->branchings().begin();
itISR!=ISRTree->branchings().end();++itISR){
if ((**itISR).status()==HardBranching::Incoming) continue;
if ((**itFSR).branchingParticle()->id()==
(**itISR).branchingParticle()->id()){
// rotate FSRTree particle to ISRTree event frame
(**itISR).branchingParticle()->setMomentum(eventFrameISR*
eventFrameFSR*
(**itFSR).branchingParticle()->momentum());
(**itISR).branchingParticle()->rescaleMass();
// add the children of the FSRTree particles to the ISRTree
if(!(**itFSR).children().empty()){
(**itISR).addChild((**itFSR).children()[0]);
(**itISR).addChild((**itFSR).children()[1]);
// rotate momenta to ISRTree event frame
(**itISR).children()[0]->branchingParticle()->setMomentum(eventFrameISR*
eventFrameFSR*
(**itFSR).children()[0]->branchingParticle()->momentum());
(**itISR).children()[1]->branchingParticle()->setMomentum(eventFrameISR*
eventFrameFSR*
(**itFSR).children()[1]->branchingParticle()->momentum());
}
}
}
}
_hardtree = ISRTree;
}
}
if(_hardtree){
connectTrees(currentTree(),_hardtree,hard);
}
}
bool Evolver::truncatedTimeLikeShower(tShowerParticlePtr particle,
HardBranchingPtr branch,
ShowerInteraction::Type type) {
int ntry=0;
do {
++ntry;
Branching fb;
unsigned int iout=0;
tcPDPtr pdata[2];
while (true) {
// no truncated shower break
if(!isTruncatedShowerON()||hardOnly()) break;
// generate emission
fb=splittingGenerator()->chooseForwardBranching(*particle,1.,type);
// no emission break
if(!fb.kinematics) break;
// check haven't evolved too far
if(fb.kinematics->scale() < branch->scale()) {
fb=Branching();
break;
}
// get the particle data objects
for(unsigned int ix=0;ix<2;++ix) pdata[ix]=getParticleData(fb.ids[ix+1]);
if(particle->id()!=fb.ids[0]) {
for(unsigned int ix=0;ix<2;++ix) {
tPDPtr cc(pdata[ix]->CC());
if(cc) pdata[ix]=cc;
}
}
// find the truncated line
iout=0;
if(pdata[0]->id()!=pdata[1]->id()) {
if(pdata[0]->id()==particle->id()) iout=1;
else if (pdata[1]->id()==particle->id()) iout=2;
}
else if(pdata[0]->id()==particle->id()) {
if(fb.kinematics->z()>0.5) iout=1;
else iout=2;
}
// apply the vetos for the truncated shower
// no flavour changing branchings
if(iout==0) {
particle->vetoEmission(fb.type,fb.kinematics->scale());
continue;
}
double zsplit = iout==1 ? fb.kinematics->z() : 1-fb.kinematics->z();
// only if same interaction for forced branching
ShowerInteraction::Type type2 = fb.type==ShowerPartnerType::QED ?
ShowerInteraction::QED : ShowerInteraction::QCD;
// and evolution
if(type2==branch->sudakov()->interactionType()) {
if(zsplit < 0.5 || // hardest line veto
fb.kinematics->scale()*zsplit < branch->scale() ) { // angular ordering veto
particle->vetoEmission(fb.type,fb.kinematics->scale());
continue;
}
}
// pt veto
if(fb.kinematics->pT() > progenitor()->maximumpT(type2)) {
particle->vetoEmission(fb.type,fb.kinematics->scale());
continue;
}
// should do base class vetos as well
if(timeLikeVetoed(fb,particle)) {
particle->vetoEmission(fb.type,fb.kinematics->scale());
continue;
}
break;
}
// if no branching force trunctaed emission
if(!fb.kinematics) {
// construct the kinematics for the hard emission
ShoKinPtr showerKin=
branch->sudakov()->createFinalStateBranching(branch->scale(),
branch->children()[0]->z(),
branch->phi(),
branch->children()[0]->pT());
showerKin->initialize( *particle,PPtr() );
IdList idlist(3);
idlist[0] = particle->id();
idlist[1] = branch->children()[0]->branchingParticle()->id();
idlist[2] = branch->children()[1]->branchingParticle()->id();
fb = Branching( showerKin, idlist, branch->sudakov(),branch->type() );
// Assign the shower kinematics to the emitting particle.
particle->showerKinematics( fb.kinematics );
// Assign the splitting function to the emitting particle.
// For the time being we are considering only 1->2 branching
// Create the ShowerParticle objects for the two children of
// the emitting particle; set the parent/child relationship
// if same as definition create particles, otherwise create cc
ShowerParticleVector theChildren;
theChildren.push_back(new_ptr(ShowerParticle(branch->children()[0]->
branchingParticle()->dataPtr(),true)));
theChildren.push_back(new_ptr(ShowerParticle(branch->children()[1]->
branchingParticle()->dataPtr(),true)));
particle->showerKinematics()->
updateChildren(particle, theChildren,fb.type);
// shower the first particle
if( branch->children()[0]->children().empty() ) {
if( ! hardOnly() )
timeLikeShower(theChildren[0],type,false);
}
else {
truncatedTimeLikeShower( theChildren[0],branch->children()[0],type);
}
// shower the second particle
if( branch->children()[1]->children().empty() ) {
if( ! hardOnly() )
timeLikeShower( theChildren[1] , type,false);
}
else {
truncatedTimeLikeShower( theChildren[1],branch->children()[1] ,type);
}
// that's if for old approach
if(_reconOpt==0) return true;
// branching has happened
particle->showerKinematics()->updateParent(particle, theChildren,fb.type);
// clean up the vetoed emission
if(particle->virtualMass()==ZERO) {
particle->showerKinematics(ShoKinPtr());
for(unsigned int ix=0;ix<theChildren.size();++ix)
particle->abandonChild(theChildren[ix]);
theChildren.clear();
}
else return true;
}
// has emitted
// Assign the shower kinematics to the emitting particle.
particle->showerKinematics(fb.kinematics);
// Assign the splitting function to the emitting particle.
// For the time being we are considering only 1->2 branching
// Create the ShowerParticle objects for the two children of
// the emitting particle; set the parent/child relationship
// if same as definition create particles, otherwise create cc
ShowerParticleVector theChildren;
theChildren.push_back( new_ptr( ShowerParticle( pdata[0], true ) ) );
theChildren.push_back( new_ptr( ShowerParticle( pdata[1], true ) ) );
particle->showerKinematics()->
updateChildren( particle, theChildren , fb.type);
// shower the first particle
if( iout == 1 ) truncatedTimeLikeShower( theChildren[0], branch , type );
else timeLikeShower( theChildren[0] , type,false);
// shower the second particle
if( iout == 2 ) truncatedTimeLikeShower( theChildren[1], branch , type );
else timeLikeShower( theChildren[1] , type,false);
// that's if for old approach
if(_reconOpt==0) return true;
// branching has happened
particle->showerKinematics()->updateParent(particle, theChildren,fb.type);
// clean up the vetoed emission
if(particle->virtualMass()==ZERO) {
particle->showerKinematics(ShoKinPtr());
for(unsigned int ix=0;ix<theChildren.size();++ix)
particle->abandonChild(theChildren[ix]);
theChildren.clear();
}
else return true;
}
while(ntry<50);
return false;
}
bool Evolver::truncatedSpaceLikeShower(tShowerParticlePtr particle, PPtr beam,
HardBranchingPtr branch,
ShowerInteraction::Type type) {
tcPDFPtr pdf;
if(ShowerHandler::currentHandler()->firstPDF().particle() == beamParticle())
pdf = ShowerHandler::currentHandler()->firstPDF().pdf();
if(ShowerHandler::currentHandler()->secondPDF().particle() == beamParticle())
pdf = ShowerHandler::currentHandler()->secondPDF().pdf();
Energy freeze = ShowerHandler::currentHandler()->pdfFreezingScale();
Branching bb;
// parameters of the force branching
double z(0.);
HardBranchingPtr timelike;
for( unsigned int ix = 0; ix < branch->children().size(); ++ix ) {
if( branch->children()[ix]->status() ==HardBranching::Outgoing) {
timelike = branch->children()[ix];
}
if( branch->children()[ix]->status() ==HardBranching::Incoming )
z = branch->children()[ix]->z();
}
// generate truncated branching
tcPDPtr part[2];
if(z>=0.&&z<=1.) {
while (true) {
if( !isTruncatedShowerON() || hardOnly() ) break;
bb = splittingGenerator()->chooseBackwardBranching( *particle,
beam, 1., beamParticle(),
type , pdf,freeze);
if( !bb.kinematics || bb.kinematics->scale() < branch->scale() ) {
bb = Branching();
break;
}
// particles as in Sudakov form factor
part[0] = getParticleData( bb.ids[0] );
part[1] = getParticleData( bb.ids[2] );
//is emitter anti-particle
if( particle->id() != bb.ids[1]) {
if( part[0]->CC() ) part[0] = part[0]->CC();
if( part[1]->CC() ) part[1] = part[1]->CC();
}
double zsplit = bb.kinematics->z();
// apply the vetos for the truncated shower
// if doesn't carry most of momentum
ShowerInteraction::Type type2 = bb.type==ShowerPartnerType::QED ?
ShowerInteraction::QED : ShowerInteraction::QCD;
if(type2==branch->sudakov()->interactionType() &&
zsplit < 0.5) {
particle->vetoEmission(bb.type,bb.kinematics->scale());
continue;
}
// others
if( part[0]->id() != particle->id() || // if particle changes type
bb.kinematics->pT() > progenitor()->maximumpT(type2) || // pt veto
bb.kinematics->scale() < branch->scale()) { // angular ordering veto
particle->vetoEmission(bb.type,bb.kinematics->scale());
continue;
}
// and those from the base class
if(spaceLikeVetoed(bb,particle)) {
particle->vetoEmission(bb.type,bb.kinematics->scale());
continue;
}
break;
}
}
if( !bb.kinematics ) {
//do the hard emission
ShoKinPtr kinematics =
branch->sudakov()->createInitialStateBranching( branch->scale(), z, branch->phi(),
branch->children()[0]->pT() );
kinematics->initialize( *particle, beam );
// assign the splitting function and shower kinematics
particle->showerKinematics( kinematics );
// For the time being we are considering only 1->2 branching
// Now create the actual particles, make the otherChild a final state
// particle, while the newParent is not
ShowerParticlePtr newParent =
new_ptr( ShowerParticle( branch->branchingParticle()->dataPtr(), false ) );
ShowerParticlePtr otherChild =
new_ptr( ShowerParticle( timelike->branchingParticle()->dataPtr(),
true, true ) );
ShowerParticleVector theChildren;
theChildren.push_back( particle );
theChildren.push_back( otherChild );
particle->showerKinematics()->
updateParent( newParent, theChildren, branch->type());
// update the history if needed
currentTree()->updateInitialStateShowerProduct( progenitor(), newParent );
currentTree()->addInitialStateBranching( particle, newParent, otherChild );
// for the reconstruction of kinematics, parent/child
// relationships are according to the branching process:
// now continue the shower
bool emitted=false;
if(!hardOnly()) {
if( branch->parent() ) {
emitted = truncatedSpaceLikeShower( newParent, beam, branch->parent() , type);
}
else {
emitted = spaceLikeShower( newParent, beam , type);
}
}
if( !emitted ) {
if( intrinsicpT().find( progenitor() ) == intrinsicpT().end() ) {
kinematics->updateLast( newParent, ZERO, ZERO );
}
else {
pair<Energy,double> kt = intrinsicpT()[progenitor()];
kinematics->updateLast( newParent,
kt.first*cos( kt.second ),
kt.first*sin( kt.second ) );
}
}
particle->showerKinematics()->
updateChildren( newParent, theChildren,bb.type);
if(hardOnly()) return true;
// perform the shower of the final-state particle
if( timelike->children().empty() ) {
timeLikeShower( otherChild , type,true);
}
else {
truncatedTimeLikeShower( otherChild, timelike , type);
}
// return the emitted
return true;
}
// assign the splitting function and shower kinematics
particle->showerKinematics( bb.kinematics );
// For the time being we are considering only 1->2 branching
// Now create the actual particles, make the otherChild a final state
// particle, while the newParent is not
ShowerParticlePtr newParent = new_ptr( ShowerParticle( part[0], false ) );
ShowerParticlePtr otherChild = new_ptr( ShowerParticle( part[1], true, true ) );
ShowerParticleVector theChildren;
theChildren.push_back( particle );
theChildren.push_back( otherChild );
particle->showerKinematics()->
updateParent( newParent, theChildren, bb.type);
// update the history if needed
currentTree()->updateInitialStateShowerProduct( progenitor(), newParent );
currentTree()->addInitialStateBranching( particle, newParent, otherChild );
// for the reconstruction of kinematics, parent/child
// relationships are according to the branching process:
// now continue the shower
bool emitted = truncatedSpaceLikeShower( newParent, beam, branch,type);
// now reconstruct the momentum
if( !emitted ) {
if( intrinsicpT().find( progenitor() ) == intrinsicpT().end() ) {
bb.kinematics->updateLast( newParent, ZERO, ZERO );
}
else {
pair<Energy,double> kt = intrinsicpT()[ progenitor() ];
bb.kinematics->updateLast( newParent,
kt.first*cos( kt.second ),
kt.first*sin( kt.second ) );
}
}
particle->showerKinematics()->
updateChildren( newParent, theChildren, bb.type);
// perform the shower of the final-state particle
timeLikeShower( otherChild , type,true);
// return the emitted
return true;
}
bool Evolver::
truncatedSpaceLikeDecayShower(tShowerParticlePtr particle,
const ShowerParticle::EvolutionScales & maxScales,
Energy minmass, HardBranchingPtr branch,
ShowerInteraction::Type type) {
Branching fb;
unsigned int iout=0;
tcPDPtr pdata[2];
while (true) {
// no truncated shower break
if(!isTruncatedShowerON()||hardOnly()) break;
fb=splittingGenerator()->chooseDecayBranching(*particle,maxScales,minmass,1.,type);
// return if no radiation
if(!fb.kinematics) break;
// check haven't evolved too far
if(fb.kinematics->scale() < branch->scale()) {
fb=Branching();
break;
}
// get the particle data objects
for(unsigned int ix=0;ix<2;++ix) pdata[ix]=getParticleData(fb.ids[ix+1]);
if(particle->id()!=fb.ids[0]) {
for(unsigned int ix=0;ix<2;++ix) {
tPDPtr cc(pdata[ix]->CC());
if(cc) pdata[ix]=cc;
}
}
// find the truncated line
iout=0;
if(pdata[0]->id()!=pdata[1]->id()) {
if(pdata[0]->id()==particle->id()) iout=1;
else if (pdata[1]->id()==particle->id()) iout=2;
}
else if(pdata[0]->id()==particle->id()) {
if(fb.kinematics->z()>0.5) iout=1;
else iout=2;
}
// apply the vetos for the truncated shower
// no flavour changing branchings
if(iout==0) {
particle->vetoEmission(fb.type,fb.kinematics->scale());
continue;
}
ShowerInteraction::Type type2 = fb.type==ShowerPartnerType::QED ?
ShowerInteraction::QED : ShowerInteraction::QCD;
double zsplit = iout==1 ? fb.kinematics->z() : 1-fb.kinematics->z();
if(type2==branch->sudakov()->interactionType()) {
if(zsplit < 0.5 || // hardest line veto
fb.kinematics->scale()*zsplit < branch->scale() ) { // angular ordering veto
particle->vetoEmission(fb.type,fb.kinematics->scale());
continue;
}
}
// pt veto
if(fb.kinematics->pT() > progenitor()->maximumpT(type2)) {
particle->vetoEmission(fb.type,fb.kinematics->scale());
continue;
}
// should do base class vetos as well
// if not vetoed break
if(!spaceLikeDecayVetoed(fb,particle)) break;
// otherwise reset scale and continue
particle->vetoEmission(fb.type,fb.kinematics->scale());
}
// this may not be currently used but in principle could be
// and should be included
if (!fb.kinematics) {
// construct the kinematics for the hard emission
ShoKinPtr showerKin=
branch->sudakov()->createDecayBranching(branch->scale(),
branch->children()[0]->z(),
branch->phi(),
branch->children()[0]->pT());
showerKin->initialize( *particle,PPtr() );
IdList idlist(3);
idlist[0] = particle->id();
idlist[1] = branch->children()[0]->branchingParticle()->id();
idlist[2] = branch->children()[1]->branchingParticle()->id();
// create the branching
fb = Branching( showerKin, idlist, branch->sudakov(),ShowerPartnerType::QCDColourLine );
// Assign the shower kinematics to the emitting particle.
particle->showerKinematics( fb.kinematics );
// Assign the splitting function to the emitting particle.
// For the time being we are considering only 1->2 branching
// Create the ShowerParticle objects for the two children of
// the emitting particle; set the parent/child relationship
// if same as definition create particles, otherwise create cc
ShowerParticleVector theChildren;
theChildren.push_back(new_ptr(ShowerParticle(branch->children()[0]->
branchingParticle()->dataPtr(),true)));
theChildren.push_back(new_ptr(ShowerParticle(branch->children()[1]->
branchingParticle()->dataPtr(),true)));
particle->showerKinematics()->
updateChildren(particle, theChildren,fb.type);
if(theChildren[0]->id()==particle->id()) {
// update the history if needed
currentTree()->updateInitialStateShowerProduct(progenitor(),theChildren[0]);
currentTree()->addInitialStateBranching(particle,theChildren[0],theChildren[1]);
// shower the space-like particle
if( branch->children()[0]->children().empty() ) {
if( ! hardOnly() ) spaceLikeDecayShower(theChildren[0],maxScales,minmass,type);
}
else {
truncatedSpaceLikeDecayShower( theChildren[0],maxScales,minmass,
branch->children()[0],type);
}
// shower the second particle
if( branch->children()[1]->children().empty() ) {
if( ! hardOnly() ) timeLikeShower( theChildren[1] , type,true);
}
else {
truncatedTimeLikeShower( theChildren[1],branch->children()[1] ,type);
}
}
else {
// update the history if needed
currentTree()->updateInitialStateShowerProduct(progenitor(),theChildren[1]);
currentTree()->addInitialStateBranching(particle,theChildren[0],theChildren[1]);
// shower the space-like particle
if( branch->children()[1]->children().empty() ) {
if( ! hardOnly() ) spaceLikeDecayShower(theChildren[1],maxScales,minmass,type);
}
else {
truncatedSpaceLikeDecayShower( theChildren[1],maxScales,minmass,
branch->children()[1],type);
}
// shower the second particle
if( branch->children()[0]->children().empty() ) {
if( ! hardOnly() ) timeLikeShower( theChildren[0] , type,true);
}
else {
truncatedTimeLikeShower( theChildren[0],branch->children()[0] ,type);
}
}
return true;
}
// has emitted
// Assign the shower kinematics to the emitting particle.
particle->showerKinematics(fb.kinematics);
// For the time being we are considering only 1->2 branching
// Create the ShowerParticle objects for the two children of
// the emitting particle; set the parent/child relationship
// if same as definition create particles, otherwise create cc
ShowerParticleVector theChildren;
theChildren.push_back(new_ptr(ShowerParticle(pdata[0],true)));
theChildren.push_back(new_ptr(ShowerParticle(pdata[1],true)));
particle->showerKinematics()->updateChildren(particle, theChildren,fb.type);
// In the case of splittings which involves coloured particles,
// set properly the colour flow of the branching.
// update the history if needed
currentTree()->updateInitialStateShowerProduct(progenitor(),theChildren[0]);
currentTree()->addInitialStateBranching(particle,theChildren[0],theChildren[1]);
// shower the first particle
truncatedSpaceLikeDecayShower(theChildren[0],maxScales,minmass,branch,type);
// shower the second particle
timeLikeShower(theChildren[1],type,true);
// branching has happened
return true;
}
bool Evolver::constructDecayTree(vector<ShowerProgenitorPtr> & particlesToShower,
ShowerInteraction::Type inter) {
Energy ptmax(-GeV);
// get the maximum pt is all ready a hard tree
if(hardTree()) {
for(unsigned int ix=0;ix<particlesToShower.size();++ix) {
if(particlesToShower[ix]->maximumpT(inter)>ptmax&&
particlesToShower[ix]->progenitor()->isFinalState())
ptmax = particlesToShower[ix]->maximumpT(inter);
}
}
vector<HardBranchingPtr> spaceBranchings,allBranchings;
for(unsigned int ix=0;ix<particlesToShower.size();++ix) {
if(particlesToShower[ix]->progenitor()->isFinalState()) {
HardBranchingPtr newBranch;
if(particlesToShower[ix]->hasEmitted()) {
newBranch =
new_ptr(HardBranching(particlesToShower[ix]->progenitor(),
particlesToShower[ix]->progenitor()->
showerKinematics()->SudakovFormFactor(),
HardBranchingPtr(),HardBranching::Outgoing));
constructTimeLikeLine(newBranch,particlesToShower[ix]->progenitor());
}
else {
newBranch =
new_ptr(HardBranching(particlesToShower[ix]->progenitor(),
SudakovPtr(),HardBranchingPtr(),
HardBranching::Outgoing));
}
allBranchings.push_back(newBranch);
}
else {
HardBranchingPtr newBranch;
if(particlesToShower[ix]->hasEmitted()) {
newBranch =
new_ptr(HardBranching(particlesToShower[ix]->progenitor(),
particlesToShower[ix]->progenitor()->
showerKinematics()->SudakovFormFactor(),
HardBranchingPtr(),HardBranching::Decay));
constructTimeLikeLine(newBranch,particlesToShower[ix]->progenitor());
HardBranchingPtr last=newBranch;
do {
for(unsigned int ix=0;ix<last->children().size();++ix) {
if(last->children()[ix]->branchingParticle()->id()==
particlesToShower[ix]->id()) {
last = last->children()[ix];
continue;
}
}
}
while(!last->children().empty());
last->status(HardBranching::Incoming);
spaceBranchings.push_back(newBranch);
allBranchings .push_back(last);
}
else {
newBranch =
new_ptr(HardBranching(particlesToShower[ix]->progenitor(),
SudakovPtr(),HardBranchingPtr(),
HardBranching::Incoming));
spaceBranchings.push_back(newBranch);
allBranchings .push_back(newBranch);
}
}
}
HardTreePtr QCDTree = new_ptr(HardTree(allBranchings,spaceBranchings,inter));
// set the charge partners
ShowerParticleVector particles;
particles.push_back(spaceBranchings.back()->branchingParticle());
for(set<HardBranchingPtr>::iterator cit=QCDTree->branchings().begin();
cit!=QCDTree->branchings().end();++cit) {
if((*cit)->status()==HardBranching::Outgoing)
particles.push_back((*cit)->branchingParticle());
}
// get the partners
showerModel()->partnerFinder()->setInitialEvolutionScales(particles,true,inter,true);
// do the inverse recon
if(!showerModel()->kinematicsReconstructor()->
deconstructDecayJets(QCDTree,this,inter)) {
return false;
}
// clear the old shower
currentTree()->clear();
// set the hard tree
hardTree(QCDTree);
// set the charge partners
setEvolutionPartners(false,inter,false);
// get the particles to be showered
map<ShowerProgenitorPtr,ShowerParticlePtr>::const_iterator cit;
map<ShowerProgenitorPtr,tShowerParticlePtr>::const_iterator cjt;
particlesToShower.clear();
// incoming particles
for(cit=currentTree()->incomingLines().begin();
cit!=currentTree()->incomingLines().end();++cit)
particlesToShower.push_back(((*cit).first));
assert(particlesToShower.size()==1);
// outgoing particles
for(cjt=currentTree()->outgoingLines().begin();
cjt!=currentTree()->outgoingLines().end();++cjt) {
particlesToShower.push_back(((*cjt).first));
if(ptmax>ZERO) particlesToShower.back()->maximumpT(ptmax,inter);
}
for(unsigned int ix=0;ix<particlesToShower.size();++ix) {
map<ShowerParticlePtr,tHardBranchingPtr>::const_iterator
eit=hardTree()->particles().end(),
mit = hardTree()->particles().find(particlesToShower[ix]->progenitor());
if( mit != eit) {
if(mit->second->status()==HardBranching::Outgoing)
particlesToShower[ix]->progenitor()->set5Momentum(mit->second->pVector());
}
}
return true;
}
bool Evolver::constructHardTree(vector<ShowerProgenitorPtr> & particlesToShower,
ShowerInteraction::Type inter) {
bool noEmission = true;
vector<HardBranchingPtr> spaceBranchings,allBranchings;
for(unsigned int ix=0;ix<particlesToShower.size();++ix) {
if(particlesToShower[ix]->progenitor()->isFinalState()) {
HardBranchingPtr newBranch;
if(particlesToShower[ix]->hasEmitted()) {
noEmission = false;
newBranch =
new_ptr(HardBranching(particlesToShower[ix]->progenitor(),
particlesToShower[ix]->progenitor()->
showerKinematics()->SudakovFormFactor(),
HardBranchingPtr(),HardBranching::Outgoing));
constructTimeLikeLine(newBranch,particlesToShower[ix]->progenitor());
}
else {
newBranch =
new_ptr(HardBranching(particlesToShower[ix]->progenitor(),
SudakovPtr(),HardBranchingPtr(),
HardBranching::Outgoing));
}
allBranchings.push_back(newBranch);
}
else {
HardBranchingPtr first,last;
if(!particlesToShower[ix]->progenitor()->parents().empty()) {
noEmission = false;
constructSpaceLikeLine(particlesToShower[ix]->progenitor(),
first,last,SudakovPtr(),
particlesToShower[ix]->original()->parents()[0]);
}
else {
first = new_ptr(HardBranching(particlesToShower[ix]->progenitor(),
SudakovPtr(),HardBranchingPtr(),
HardBranching::Incoming));
if(particlesToShower[ix]->original()->parents().empty())
first->beam(particlesToShower[ix]->original());
else
first->beam(particlesToShower[ix]->original()->parents()[0]);
last = first;
}
spaceBranchings.push_back(first);
allBranchings.push_back(last);
}
}
if(!noEmission) {
HardTreePtr QCDTree = new_ptr(HardTree(allBranchings,spaceBranchings,
inter));
// set the charge partners
ShowerParticleVector particles;
for(set<HardBranchingPtr>::iterator cit=QCDTree->branchings().begin();
cit!=QCDTree->branchings().end();++cit) {
particles.push_back((*cit)->branchingParticle());
}
// get the partners
showerModel()->partnerFinder()->setInitialEvolutionScales(particles,false,
inter,true);
// do the inverse recon
if(!showerModel()->kinematicsReconstructor()->
deconstructHardJets(QCDTree,this,inter))
throw Exception() << "Can't to shower deconstruction for QED shower in"
<< "QEDEvolver::showerHard" << Exception::eventerror;
// set the hard tree
hardTree(QCDTree);
}
// clear the old shower
currentTree()->clear();
// set the charge partners
setEvolutionPartners(true,inter,false);
// get the particles to be showered
particlesToShower = currentTree()->extractProgenitors();
// reset momenta
if(hardTree()) {
for(unsigned int ix=0;ix<particlesToShower.size();++ix) {
map<ShowerParticlePtr,tHardBranchingPtr>::const_iterator
eit=hardTree()->particles().end(),
mit = hardTree()->particles().find(particlesToShower[ix]->progenitor());
if( mit != eit) {
particlesToShower[ix]->progenitor()->set5Momentum(mit->second->showerMomentum());
}
}
}
return true;
}
void Evolver::constructTimeLikeLine(tHardBranchingPtr branch,
tShowerParticlePtr particle) {
for(unsigned int ix=0;ix<particle->children().size();++ix) {
HardBranching::Status status = branch->status();
tShowerParticlePtr child =
dynamic_ptr_cast<ShowerParticlePtr>(particle->children()[ix]);
if(child->children().empty()) {
HardBranchingPtr newBranch =
new_ptr(HardBranching(child,SudakovPtr(),branch,status));
branch->addChild(newBranch);
}
else {
HardBranchingPtr newBranch =
new_ptr(HardBranching(child,child->showerKinematics()->SudakovFormFactor(),
branch,status));
constructTimeLikeLine(newBranch,child);
branch->addChild(newBranch);
}
}
// sort out the type of interaction
if(!branch->children().empty()) {
if(branch->branchingParticle()->id()==ParticleID::gamma ||
branch->children()[0]->branchingParticle()->id()==ParticleID::gamma ||
branch->children()[1]->branchingParticle()->id()==ParticleID::gamma)
branch->type(ShowerPartnerType::QED);
else {
if(branch->branchingParticle()->id()==
branch->children()[0]->branchingParticle()->id()) {
if(branch->branchingParticle()->dataPtr()->iColour()==PDT::Colour8) {
tShowerParticlePtr emittor =
branch->branchingParticle()->showerKinematics()->z()>0.5 ?
branch->children()[0]->branchingParticle() :
branch->children()[1]->branchingParticle();
if(branch->branchingParticle()->colourLine()==emittor->colourLine())
branch->type(ShowerPartnerType::QCDAntiColourLine);
else if(branch->branchingParticle()->antiColourLine()==emittor->antiColourLine())
branch->type(ShowerPartnerType::QCDColourLine);
else
assert(false);
}
else if(branch->branchingParticle()->colourLine()) {
branch->type(ShowerPartnerType::QCDColourLine);
}
else if(branch->branchingParticle()->antiColourLine()) {
branch->type(ShowerPartnerType::QCDAntiColourLine);
}
else
assert(false);
}
else if(branch->branchingParticle()->id()==ParticleID::g &&
branch->children()[0]->branchingParticle()->id()==
-branch->children()[1]->branchingParticle()->id()) {
if(branch->branchingParticle()->showerKinematics()->z()>0.5)
branch->type(ShowerPartnerType::QCDAntiColourLine);
else
branch->type(ShowerPartnerType::QCDColourLine);
}
else
assert(false);
}
}
}
void Evolver::constructSpaceLikeLine(tShowerParticlePtr particle,
HardBranchingPtr & first,
HardBranchingPtr & last,
SudakovPtr sud,PPtr beam) {
if(!particle) return;
if(!particle->parents().empty()) {
tShowerParticlePtr parent =
dynamic_ptr_cast<ShowerParticlePtr>(particle->parents()[0]);
SudakovPtr newSud=particle->showerKinematics()->SudakovFormFactor();
constructSpaceLikeLine(parent,first,last,newSud,beam);
}
HardBranchingPtr newBranch =
new_ptr(HardBranching(particle,sud,last,HardBranching::Incoming));
newBranch->beam(beam);
if(!first) {
first=newBranch;
last =newBranch;
return;
}
last->addChild(newBranch);
tShowerParticlePtr timeChild =
dynamic_ptr_cast<ShowerParticlePtr>(particle->parents()[0]->children()[1]);
HardBranchingPtr timeBranch;
if(!timeChild->children().empty()) {
timeBranch =
new_ptr(HardBranching(timeChild,
timeChild->showerKinematics()->SudakovFormFactor(),
last,HardBranching::Outgoing));
constructTimeLikeLine(timeBranch,timeChild);
}
else {
timeBranch =
new_ptr(HardBranching(timeChild,SudakovPtr(),last,HardBranching::Outgoing));
}
last->addChild(timeBranch);
// sort out the type
if(last->branchingParticle() ->id() == ParticleID::gamma ||
newBranch->branchingParticle() ->id() == ParticleID::gamma ||
timeBranch->branchingParticle()->id() == ParticleID::gamma) {
last->type(ShowerPartnerType::QED);
}
else if(last->branchingParticle()->id()==newBranch->branchingParticle()->id()) {
if(last->branchingParticle()->id()==ParticleID::g) {
if(last->branchingParticle()->colourLine()==
newBranch->branchingParticle()->colourLine()) {
last->type(ShowerPartnerType::QCDAntiColourLine);
}
else {
last->type(ShowerPartnerType::QCDColourLine);
}
}
else if(last->branchingParticle()->hasColour()) {
last->type(ShowerPartnerType::QCDColourLine);
}
else if(last->branchingParticle()->hasAntiColour()) {
last->type(ShowerPartnerType::QCDAntiColourLine);
}
else
assert(false);
}
else if(newBranch->branchingParticle()->id()==ParticleID::g) {
if(last->branchingParticle()->hasColour()) {
last->type(ShowerPartnerType::QCDAntiColourLine);
}
else if(last->branchingParticle()->hasAntiColour()) {
last->type(ShowerPartnerType::QCDColourLine);
}
else
assert(false);
}
else if(newBranch->branchingParticle()->hasColour()) {
last->type(ShowerPartnerType::QCDColourLine);
}
else if(newBranch->branchingParticle()->hasAntiColour()) {
last->type(ShowerPartnerType::QCDAntiColourLine);
}
else {
assert(false);
}
last=newBranch;
}
void Evolver::connectTrees(ShowerTreePtr showerTree,
HardTreePtr hardTree, bool hard ) {
ShowerParticleVector particles;
// find the Sudakovs
for(set<HardBranchingPtr>::iterator cit=hardTree->branchings().begin();
cit!=hardTree->branchings().end();++cit) {
// Sudakovs for ISR
if((**cit).parent()&&(**cit).status()==HardBranching::Incoming) {
++_nis;
IdList br(3);
br[0] = (**cit).parent()->branchingParticle()->id();
br[1] = (**cit). branchingParticle()->id();
br[2] = (**cit).parent()->children()[0]==*cit ?
(**cit).parent()->children()[1]->branchingParticle()->id() :
(**cit).parent()->children()[0]->branchingParticle()->id();
BranchingList branchings = splittingGenerator()->initialStateBranchings();
if(br[1]<0&&br[0]==br[1]) {
br[0] = abs(br[0]);
br[1] = abs(br[1]);
}
else if(br[1]<0) {
br[1] = -br[1];
br[2] = -br[2];
}
long index = abs(br[1]);
SudakovPtr sudakov;
for(BranchingList::const_iterator cjt = branchings.lower_bound(index);
cjt != branchings.upper_bound(index); ++cjt ) {
IdList ids = cjt->second.second;
if(ids[0]==br[0]&&ids[1]==br[1]&&ids[2]==br[2]) {
sudakov=cjt->second.first;
break;
}
}
if(!sudakov) throw Exception() << "Can't find Sudakov for the hard emission in "
<< "Evolver::connectTrees() for ISR"
<< Exception::runerror;
(**cit).parent()->sudakov(sudakov);
}
// Sudakovs for FSR
else if(!(**cit).children().empty()) {
++_nfs;
IdList br(3);
br[0] = (**cit) .branchingParticle()->id();
br[1] = (**cit).children()[0]->branchingParticle()->id();
br[2] = (**cit).children()[1]->branchingParticle()->id();
BranchingList branchings = splittingGenerator()->finalStateBranchings();
if(br[0]<0) {
br[0] = abs(br[0]);
br[1] = abs(br[1]);
br[2] = abs(br[2]);
}
long index = br[0];
SudakovPtr sudakov;
for(BranchingList::const_iterator cjt = branchings.lower_bound(index);
cjt != branchings.upper_bound(index); ++cjt ) {
IdList ids = cjt->second.second;
if(ids[0]==br[0]&&ids[1]==br[1]&&ids[2]==br[2]) {
sudakov=cjt->second.first;
break;
}
}
if(!sudakov) throw Exception() << "Can't find Sudakov for the hard emission in "
<< "Evolver::connectTrees()"
<< Exception::runerror;
(**cit).sudakov(sudakov);
}
}
// calculate the evolution scale
for(set<HardBranchingPtr>::iterator cit=hardTree->branchings().begin();
cit!=hardTree->branchings().end();++cit) {
particles.push_back((*cit)->branchingParticle());
}
showerModel()->partnerFinder()->
setInitialEvolutionScales(particles,!hard,hardTree->interaction(),
!hardTree->partnersSet());
hardTree->partnersSet(true);
// inverse reconstruction
if(hard)
showerModel()->kinematicsReconstructor()->
deconstructHardJets(hardTree,ShowerHandler::currentHandler()->evolver(),
hardTree->interaction());
else
showerModel()->kinematicsReconstructor()->
deconstructDecayJets(hardTree,ShowerHandler::currentHandler()->evolver(),
hardTree->interaction());
// now reset the momenta of the showering particles
vector<ShowerProgenitorPtr> particlesToShower;
for(map<ShowerProgenitorPtr,ShowerParticlePtr>::const_iterator
cit=showerTree->incomingLines().begin();
cit!=showerTree->incomingLines().end();++cit )
particlesToShower.push_back(cit->first);
// extract the showering particles
for(map<ShowerProgenitorPtr,tShowerParticlePtr>::const_iterator
cit=showerTree->outgoingLines().begin();
cit!=showerTree->outgoingLines().end();++cit )
particlesToShower.push_back(cit->first);
// match them
vector<bool> matched(particlesToShower.size(),false);
for(set<HardBranchingPtr>::const_iterator cit=hardTree->branchings().begin();
cit!=hardTree->branchings().end();++cit) {
Energy2 dmin( 1e30*GeV2 );
int iloc(-1);
for(unsigned int ix=0;ix<particlesToShower.size();++ix) {
if(matched[ix]) continue;
if( (**cit).branchingParticle()->id() != particlesToShower[ix]->progenitor()->id() ) continue;
if( (**cit).branchingParticle()->isFinalState() !=
particlesToShower[ix]->progenitor()->isFinalState() ) continue;
Energy2 dtest =
sqr( particlesToShower[ix]->progenitor()->momentum().x() - (**cit).showerMomentum().x() ) +
sqr( particlesToShower[ix]->progenitor()->momentum().y() - (**cit).showerMomentum().y() ) +
sqr( particlesToShower[ix]->progenitor()->momentum().z() - (**cit).showerMomentum().z() ) +
sqr( particlesToShower[ix]->progenitor()->momentum().t() - (**cit).showerMomentum().t() );
// add mass difference for identical particles (e.g. Z0 Z0 production)
dtest += 1e10*sqr(particlesToShower[ix]->progenitor()->momentum().m()-
(**cit).showerMomentum().m());
if( dtest < dmin ) {
iloc = ix;
dmin = dtest;
}
}
if(iloc<0) throw Exception() << "Failed to match shower and hard trees in Evolver::hardestEmission"
<< Exception::eventerror;
particlesToShower[iloc]->progenitor()->set5Momentum((**cit).showerMomentum());
matched[iloc] = true;
}
// correction boosts for daughter trees
for(map<tShowerTreePtr,pair<tShowerProgenitorPtr,tShowerParticlePtr> >::const_iterator
tit = showerTree->treelinks().begin();
tit != showerTree->treelinks().end();++tit) {
ShowerTreePtr decayTree = tit->first;
map<ShowerProgenitorPtr,ShowerParticlePtr>::const_iterator
cit = decayTree->incomingLines().begin();
// reset the momentum of the decay particle
Lorentz5Momentum oldMomentum = cit->first->progenitor()->momentum();
Lorentz5Momentum newMomentum = tit->second.second->momentum();
LorentzRotation boost( oldMomentum.findBoostToCM(),oldMomentum.e()/oldMomentum.mass());
boost.boost (-newMomentum.findBoostToCM(),newMomentum.e()/newMomentum.mass());
decayTree->transform(boost,true);
}
}
void Evolver::doShowering(bool hard,XCPtr xcomb) {
// order of the interactions
bool showerOrder(true);
// zero number of emissions
_nis = _nfs = 0;
// extract particles to shower
vector<ShowerProgenitorPtr> particlesToShower(setupShower(hard));
// setup the maximum scales for the shower
if (hardVetoOn()) setupMaximumScales(particlesToShower,xcomb);
// specific stuff for hard processes and decays
Energy minmass(ZERO), mIn(ZERO);
// hard process generate the intrinsic p_T once and for all
if(hard) {
generateIntrinsicpT(particlesToShower);
}
// decay compute the minimum mass of the final-state
else {
for(unsigned int ix=0;ix<particlesToShower.size();++ix) {
if(particlesToShower[ix]->progenitor()->isFinalState()) {
if(particlesToShower[ix]->progenitor()->dataPtr()->stable())
minmass += particlesToShower[ix]->progenitor()->dataPtr()->constituentMass();
else
minmass += particlesToShower[ix]->progenitor()->mass();
}
else {
mIn = particlesToShower[ix]->progenitor()->mass();
}
}
// throw exception if decay can't happen
if ( minmass > mIn ) {
throw Exception() << "Evolver.cc: Mass of decaying particle is "
<< "below constituent masses of decay products."
<< Exception::eventerror;
}
}
// check if interactions in right order
if(hardTree() && interaction_!=4 &&
hardTree()->interaction()!=interactions_[0]) {
assert(interactions_.size()==2);
showerOrder = false;
swap(interactions_[0],interactions_[1]);
}
// loop over possible interactions
for(unsigned int inter=0;inter<interactions_.size();++inter) {
// set up for second pass if required
if(inter!=0) {
// zero intrinsic pt so only added first time round
intrinsicpT().clear();
// construct the tree and throw veto if not possible
if(!(hard ?
constructHardTree (particlesToShower,interactions_[inter]) :
constructDecayTree(particlesToShower,interactions_[inter])))
throw InteractionVeto();
}
// main shower loop
unsigned int ntry(0);
bool reconstructed = false;
do {
// clear results of last attempt if needed
if(ntry!=0) {
currentTree()->clear();
setEvolutionPartners(hard,interactions_[inter],true);
_nis = _nfs = 0;
for(unsigned int ix=0; ix<particlesToShower.size();++ix) {
SpinPtr spin = particlesToShower[ix]->progenitor()->spinInfo();
if(spin && spin->decayVertex() &&
dynamic_ptr_cast<tcSVertexPtr>(spin->decayVertex())) {
spin->decayVertex(VertexPtr());
}
}
}
// generate the shower
// pick random starting point
unsigned int istart=UseRandom::irnd(particlesToShower.size());
unsigned int istop = particlesToShower.size();
// loop over particles with random starting point
for(unsigned int ix=istart;ix<=istop;++ix) {
if(ix==particlesToShower.size()) {
if(istart!=0) {
istop = istart-1;
ix=0;
}
else break;
}
// extract the progenitor
progenitor(particlesToShower[ix]);
// final-state radiation
if(progenitor()->progenitor()->isFinalState()) {
if(!isFSRadiationON()) continue;
// perform shower
progenitor()->hasEmitted(startTimeLikeShower(interactions_[inter]));
}
// initial-state radiation
else {
if(!isISRadiationON()) continue;
// hard process
if(hard) {
// get the PDF
setBeamParticle(_progenitor->beam());
assert(beamParticle());
// perform the shower
// set the beam particle
tPPtr beamparticle=progenitor()->original();
if(!beamparticle->parents().empty())
beamparticle=beamparticle->parents()[0];
// generate the shower
progenitor()->hasEmitted(startSpaceLikeShower(beamparticle,
interactions_[inter]));
}
// decay
else {
// skip colour and electrically neutral particles
if(!progenitor()->progenitor()->dataPtr()->coloured() &&
!progenitor()->progenitor()->dataPtr()->charged()) {
progenitor()->hasEmitted(false);
continue;
}
// perform shower
// set the scales correctly. The current scale is the maximum scale for
// emission not the starting scale
ShowerParticle::EvolutionScales maxScales(progenitor()->progenitor()->scales());
progenitor()->progenitor()->scales() = ShowerParticle::EvolutionScales();
if(progenitor()->progenitor()->dataPtr()->charged()) {
progenitor()->progenitor()->scales().QED = progenitor()->progenitor()->mass();
progenitor()->progenitor()->scales().QED_noAO = progenitor()->progenitor()->mass();
}
if(progenitor()->progenitor()->hasColour()) {
progenitor()->progenitor()->scales().QCD_c = progenitor()->progenitor()->mass();
progenitor()->progenitor()->scales().QCD_c_noAO = progenitor()->progenitor()->mass();
}
if(progenitor()->progenitor()->hasAntiColour()) {
progenitor()->progenitor()->scales().QCD_ac = progenitor()->progenitor()->mass();
progenitor()->progenitor()->scales().QCD_ac_noAO = progenitor()->progenitor()->mass();
}
// perform the shower
progenitor()->hasEmitted(startSpaceLikeDecayShower(maxScales,minmass,
interactions_[inter]));
}
}
}
// do the kinematic reconstruction, checking if it worked
reconstructed = hard ?
showerModel()->kinematicsReconstructor()->
reconstructHardJets (currentTree(),intrinsicpT(),interactions_[inter]) :
showerModel()->kinematicsReconstructor()->
reconstructDecayJets(currentTree(),interactions_[inter]);
}
while(!reconstructed&&maximumTries()>++ntry);
// check if failed to generate the shower
if(ntry==maximumTries()) {
if(hard)
throw ShowerHandler::ShowerTriesVeto(ntry);
else
throw Exception() << "Failed to generate the shower after "
<< ntry << " attempts in Evolver::showerDecay()"
<< Exception::eventerror;
}
}
// tree has now showered
_currenttree->hasShowered(true);
if(!showerOrder) swap(interactions_[0],interactions_[1]);
hardTree(HardTreePtr());
}
diff --git a/Shower/Base/Evolver.h b/Shower/Base/Evolver.h
--- a/Shower/Base/Evolver.h
+++ b/Shower/Base/Evolver.h
@@ -1,776 +1,782 @@
// -*- C++ -*-
//
// Evolver.h is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2011 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef HERWIG_Evolver_H
#define HERWIG_Evolver_H
//
// This is the declaration of the Evolver class.
//
#include "ThePEG/Interface/Interfaced.h"
#include "Herwig++/Shower/SplittingFunctions/SplittingGenerator.h"
#include "ShowerModel.h"
#include "ThePEG/PDF/BeamParticleData.h"
#include "ShowerTree.h"
#include "ShowerProgenitor.fh"
#include "Herwig++/Shower/ShowerHandler.fh"
#include "Branching.h"
#include "ShowerVeto.h"
#include "HardTree.h"
#include "ThePEG/Handlers/XComb.h"
#include "Evolver.fh"
#include "Herwig++/MatrixElement/HwMEBase.h"
#include "Herwig++/Decay/HwDecayerBase.h"
namespace Herwig {
using namespace ThePEG;
/**\ingroup Shower
* Exception class
* used to communicate failure of QED shower
*/
struct InteractionVeto {};
/** \ingroup Shower
* The Evolver class class performs the sohwer evolution of hard scattering
* and decay processes in Herwig++.
*
* @see \ref EvolverInterfaces "The interfaces"
* defined for Evolver.
*/
class Evolver: public Interfaced {
/**
* The ShowerHandler is a friend to set some parameters at initialisation
*/
friend class ShowerHandler;
public:
/**
* Pointer to an XComb object
*/
typedef Ptr<XComb>::pointer XCPtr;
public:
/**
* Default Constructor
*/
Evolver() : _maxtry(100), _meCorrMode(1), _hardVetoMode(1),
_hardVetoRead(0), _reconOpt(0), _hardVetoReadOption(false),
_iptrms(ZERO), _beta(0.), _gamma(ZERO), _iptmax(),
_limitEmissions(0), _initialenhance(1.), _finalenhance(1.),
interaction_(1), _trunc_Mode(true), _hardEmissionMode(0),
- _colourEvolutionMethod(0), _hardScaleFactor(1.0), _spinOpt(0)
+ _colourEvolutionMethod(0), _hardScaleFactor(1.0), _spinOpt(0),
+ _softOpt(0)
{}
/**
* Members to perform the shower
*/
//@{
/**
* Perform the shower of the hard process
*/
virtual void showerHardProcess(ShowerTreePtr,XCPtr);
/**
* Perform the shower of a decay
*/
virtual void showerDecay(ShowerTreePtr);
//@}
/**
* Access to the flags and shower variables
*/
//@{
/**
* Is there any showering switched on
*/
bool showeringON() const { return isISRadiationON() || isFSRadiationON(); }
/**
* It returns true/false if the initial-state radiation is on/off.
*/
bool isISRadiationON() const { return _splittingGenerator->isISRadiationON(); }
/**
* It returns true/false if the final-state radiation is on/off.
*/
bool isFSRadiationON() const { return _splittingGenerator->isFSRadiationON(); }
/**
* Get the ShowerModel
*/
ShowerModelPtr showerModel() const {return _model;}
/**
* Get the SplittingGenerator
*/
tSplittingGeneratorPtr splittingGenerator() const { return _splittingGenerator; }
//@}
/**
* Connect the Hard and Shower trees
*/
virtual void connectTrees(ShowerTreePtr showerTree, HardTreePtr hardTree, bool hard );
/**
* Access to switches for spin correlations
*/
//@{
/**
* Spin Correlations
*/
- bool spinCorrelations() const {
- return _spinOpt==1 || _spinOpt==3;
+ unsigned int spinCorrelations() const {
+ return _spinOpt;
}
/**
* Soft correlations
*/
- bool softCorrelations() const {
- return _spinOpt==2 || _spinOpt==3;
+ unsigned int softCorrelations() const {
+ return _softOpt;
}
/**
* Any correlations
*/
bool correlations() const {
- return _spinOpt!=0;
+ return _spinOpt!=0||_softOpt!=0;
}
//@}
public:
/** @name Functions used by the persistent I/O system. */
//@{
/**
* Function used to write out object persistently.
* @param os the persistent output stream written to.
*/
void persistentOutput(PersistentOStream & os) const;
/**
* Function used to read in object persistently.
* @param is the persistent input stream read from.
* @param version the version number of the object when written.
*/
void persistentInput(PersistentIStream & is, int version);
//@}
/**
* The standard Init function used to initialize the interfaces.
* Called exactly once for each class by the class description system
* before the main function starts or
* when this class is dynamically loaded.
*/
static void Init();
protected:
/**
* Perform the shower
*/
void doShowering(bool hard,XCPtr);
/**
* Generate the hard matrix element correction
*/
virtual void hardMatrixElementCorrection(bool);
/**
* Generate the hardest emission
*/
virtual void hardestEmission(bool hard);
/**
* Extract the particles to be showered, set the evolution scales
* and apply the hard matrix element correction
* @param hard Whether this is a hard process or decay
* @return The particles to be showered
*/
virtual vector<ShowerProgenitorPtr> setupShower(bool hard);
/**
* set the colour partners
*/
virtual void setEvolutionPartners(bool hard,ShowerInteraction::Type,
bool clear);
/**
* Methods to perform the evolution of an individual particle, including
* recursive calling on the products
*/
//@{
/**
* It does the forward evolution of the time-like input particle
* (and recursively for all its radiation products).
* accepting only emissions which conforms to the showerVariables
* and soft matrix element correction.
* If at least one emission has occurred then the method returns true.
* @param particle The particle to be showered
*/
virtual bool timeLikeShower(tShowerParticlePtr particle, ShowerInteraction::Type,
bool first);
/**
* It does the backward evolution of the space-like input particle
* (and recursively for all its time-like radiation products).
* accepting only emissions which conforms to the showerVariables.
* If at least one emission has occurred then the method returns true
* @param particle The particle to be showered
* @param beam The beam particle
*/
virtual bool spaceLikeShower(tShowerParticlePtr particle,PPtr beam,
ShowerInteraction::Type);
/**
* If does the forward evolution of the input on-shell particle
* involved in a decay
* (and recursively for all its time-like radiation products).
* accepting only emissions which conforms to the showerVariables.
* @param particle The particle to be showered
* @param maxscale The maximum scale for the shower.
* @param minimumMass The minimum mass of the final-state system
*/
virtual bool
spaceLikeDecayShower(tShowerParticlePtr particle,
const ShowerParticle::EvolutionScales & maxScales,
Energy minimumMass,ShowerInteraction::Type);
/**
* Truncated shower from a time-like particle
*/
virtual bool truncatedTimeLikeShower(tShowerParticlePtr particle,
HardBranchingPtr branch,
ShowerInteraction::Type type);
/**
* Truncated shower from a space-like particle
*/
virtual bool truncatedSpaceLikeShower(tShowerParticlePtr particle,PPtr beam,
HardBranchingPtr branch,
ShowerInteraction::Type type);
/**
* Truncated shower from a time-like particle
*/
virtual bool truncatedSpaceLikeDecayShower(tShowerParticlePtr particle,
const ShowerParticle::EvolutionScales & maxScales,
Energy minimumMass, HardBranchingPtr branch,
ShowerInteraction::Type type);
//@}
/**
* Switches for matrix element corrections
*/
//@{
/**
* Any ME correction?
*/
bool MECOn() const {
return _meCorrMode > 0 && _hardEmissionMode==0;
}
/**
* Any hard ME correction?
*/
bool hardMEC() const {
return (_meCorrMode == 1 || _meCorrMode == 2) && _hardEmissionMode==0;
}
/**
* Any soft ME correction?
*/
bool softMEC() const {
return (_meCorrMode == 1 || _meCorrMode > 2) && _hardEmissionMode==0;
}
//@}
/**
* Is the truncated shower on?
*/
bool isTruncatedShowerON() const {return _trunc_Mode;}
/**
* Switch for intrinsic pT
*/
//@{
/**
* Any intrinsic pT?
*/
bool ipTon() const {
return _iptrms != ZERO || ( _beta == 1.0 && _gamma != ZERO && _iptmax !=ZERO );
}
//@}
/**@name Additional shower vetoes */
//@{
/**
* Insert a veto.
*/
void addVeto (ShowerVetoPtr v) { _vetoes.push_back(v); }
/**
* Remove a veto.
*/
void removeVeto (ShowerVetoPtr v) {
vector<ShowerVetoPtr>::iterator vit = find(_vetoes.begin(),_vetoes.end(),v);
if (vit != _vetoes.end())
_vetoes.erase(vit);
}
//@}
/**
* Switches for vetoing hard emissions
*/
//@{
/**
* Vetos on?
*/
bool hardVetoOn() const { return _hardVetoMode > 0; }
/**
* veto hard emissions in IS shower?
*/
bool hardVetoIS() const { return _hardVetoMode == 1 || _hardVetoMode == 2; }
/**
* veto hard emissions in FS shower?
*/
bool hardVetoFS() const { return _hardVetoMode == 1 || _hardVetoMode > 2; }
/**
* veto hard emissions according to lastScale from XComb?
*/
bool hardVetoXComb() const {return (_hardVetoRead == 1);}
/**
* Returns true if the hard veto read-in is to be applied to only
* the primary collision and false otherwise.
*/
bool hardVetoReadOption() const {return _hardVetoReadOption;}
//@}
/**
* Enhancement factors for radiation needed to generate the soft matrix
* element correction.
*/
//@{
/**
* Access the enhancement factor for initial-state radiation
*/
double initialStateRadiationEnhancementFactor() const { return _initialenhance; }
/**
* Access the enhancement factor for final-state radiation
*/
double finalStateRadiationEnhancementFactor() const { return _finalenhance; }
/**
* Set the enhancement factor for initial-state radiation
*/
void initialStateRadiationEnhancementFactor(double in) { _initialenhance=in; }
/**
* Set the enhancement factor for final-state radiation
*/
void finalStateRadiationEnhancementFactor(double in) { _finalenhance=in; }
//@}
/**
* Access to set/get the HardTree currently beinging showered
*/
//@{
/**
* The HardTree currently being showered
*/
tHardTreePtr hardTree() {return _hardtree;}
/**
* The HardTree currently being showered
*/
void hardTree(tHardTreePtr in) {_hardtree = in;}
//@}
/**
* Access/set the beam particle for the current initial-state shower
*/
//@{
/**
* Get the beam particle data
*/
Ptr<BeamParticleData>::const_pointer beamParticle() const { return _beam; }
/**
* Set the beam particle data
*/
void setBeamParticle(Ptr<BeamParticleData>::const_pointer in) { _beam=in; }
//@}
/**
* Set/Get the current tree being evolverd for inheriting classes
*/
//@{
/**
* Get the tree
*/
tShowerTreePtr currentTree() { return _currenttree; }
/**
* Set the tree
*/
void currentTree(tShowerTreePtr tree) { _currenttree=tree; }
//@}
/**
* Access the maximum number of attempts to generate the shower
*/
unsigned int maximumTries() const { return _maxtry; }
/**
* Set/Get the ShowerProgenitor for the current shower
*/
//@{
/**
* Access the progenitor
*/
ShowerProgenitorPtr progenitor() { return _progenitor; }
/**
* Set the progenitor
*/
void progenitor(ShowerProgenitorPtr in) { _progenitor=in; }
//@}
/**
* Calculate the intrinsic \f$p_T\f$.
*/
virtual void generateIntrinsicpT(vector<ShowerProgenitorPtr>);
/**
* Access to the intrinsic \f$p_T\f$ for inheriting classes
*/
map<tShowerProgenitorPtr,pair<Energy,double> > & intrinsicpT() { return _intrinsic; }
/**
* find the maximally allowed pt acc to the hard process.
*/
void setupMaximumScales(const vector<ShowerProgenitorPtr> &,XCPtr);
/**
* Return the factor to multiply the hard veto scale
*/
double hardScaleFactor() const { return _hardScaleFactor; }
/**
* Set the factor to multiply the hard veto scale
*/
void hardScaleFactor(double f) { _hardScaleFactor = f; };
protected:
/**
* Start the shower of a timelike particle
*/
virtual bool startTimeLikeShower(ShowerInteraction::Type);
/**
* Update of the time-like stuff
*/
void updateHistory(tShowerParticlePtr particle);
/**
* Start the shower of a spacelike particle
*/
virtual bool startSpaceLikeShower(PPtr,ShowerInteraction::Type);
/**
* Start the shower of a spacelike particle
*/
virtual bool
startSpaceLikeDecayShower(const ShowerParticle::EvolutionScales & maxScales,
Energy minimumMass,ShowerInteraction::Type);
/**
* Vetos for the timelike shower
*/
virtual bool timeLikeVetoed(const Branching &,ShowerParticlePtr);
/**
* Vetos for the spacelike shower
*/
virtual bool spaceLikeVetoed(const Branching &,ShowerParticlePtr);
/**
* Vetos for the spacelike shower
*/
virtual bool spaceLikeDecayVetoed(const Branching &,ShowerParticlePtr);
/**
* Only generate the hard emission, for testing only.
*/
bool hardOnly() const {return _limitEmissions==3;}
/**
* Members to construct the HardTree from the shower if needed
*/
//@{
/**
* Construct the tree for a scattering process
*/
bool constructHardTree(vector<ShowerProgenitorPtr> & particlesToShower,
ShowerInteraction::Type inter);
/**
* Construct the tree for a decay process
*/
bool constructDecayTree(vector<ShowerProgenitorPtr> & particlesToShower,
ShowerInteraction::Type inter);
/**
* Construct a time-like line
*/
void constructTimeLikeLine(tHardBranchingPtr branch,tShowerParticlePtr particle);
/**
* Construct a space-like line
*/
void constructSpaceLikeLine(tShowerParticlePtr particle,
HardBranchingPtr & first, HardBranchingPtr & last,
SudakovPtr sud,PPtr beam);
//@}
protected:
/** @name Clone Methods. */
//@{
/**
* Make a simple clone of this object.
* @return a pointer to the new object.
*/
virtual IBPtr clone() const;
/** Make a clone of this object, possibly modifying the cloned object
* to make it sane.
* @return a pointer to the new object.
*/
virtual IBPtr fullclone() const;
//@}
protected:
/** @name Standard Interfaced functions. */
//@{
/**
* Initialize this object after the setup phase before saving an
* EventGenerator to disk.
* @throws InitException if object could not be initialized properly.
*/
virtual void doinit();
//@}
private:
/**
* Get the octet -> octet octet reduction factor.
*/
double getReductionFactor(tShowerParticlePtr particle);
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
Evolver & operator=(const Evolver &);
private:
/**
* Pointer to the model for the shower evolution model
*/
ShowerModelPtr _model;
/**
* Pointer to the splitting generator
*/
SplittingGeneratorPtr _splittingGenerator;
/**
* Maximum number of tries to generate the shower of a particular tree
*/
unsigned int _maxtry;
/**
* Matrix element correction switch
*/
unsigned int _meCorrMode;
/**
* Hard emission veto switch
*/
unsigned int _hardVetoMode;
/**
* Hard veto to be read switch
*/
unsigned int _hardVetoRead;
/**
* Control of the reconstruction option
*/
unsigned int _reconOpt;
/**
* If hard veto pT scale is being read-in this determines
* whether the read-in value is applied to primary and
* secondary (MPI) scatters or just the primary one, with
* the usual computation of the veto being performed for
* the secondary (MPI) scatters.
*/
bool _hardVetoReadOption;
/**
* rms intrinsic pT of Gaussian distribution
*/
Energy _iptrms;
/**
* Proportion of inverse quadratic intrinsic pT distribution
*/
double _beta;
/**
* Parameter for inverse quadratic: 2*Beta*Gamma/(sqr(Gamma)+sqr(intrinsicpT))
*/
Energy _gamma;
/**
* Upper bound on intrinsic pT for inverse quadratic
*/
Energy _iptmax;
/**
* Limit the number of emissions for testing
*/
unsigned int _limitEmissions;
/**
* The progenitor of the current shower
*/
ShowerProgenitorPtr _progenitor;
/**
* Matrix element
*/
HwMEBasePtr _hardme;
/**
* Decayer
*/
HwDecayerBasePtr _decayme;
/**
* The ShowerTree currently being showered
*/
ShowerTreePtr _currenttree;
/**
* The HardTree currently being showered
*/
HardTreePtr _hardtree;
/**
* Radiation enhancement factors for use with the veto algorithm
* if needed by the soft matrix element correction
*/
//@{
/**
* Enhancement factor for initial-state radiation
*/
double _initialenhance;
/**
* Enhancement factor for final-state radiation
*/
double _finalenhance;
//@}
/**
* The beam particle data for the current initial-state shower
*/
Ptr<BeamParticleData>::const_pointer _beam;
/**
* Storage of the intrinsic \f$p_t\f$ of the particles
*/
map<tShowerProgenitorPtr,pair<Energy,double> > _intrinsic;
/**
* Vetoes
*/
vector<ShowerVetoPtr> _vetoes;
/**
* number of IS emissions
*/
unsigned int _nis;
/**
* Number of FS emissions
*/
unsigned int _nfs;
/**
* The option for wqhich interactions to use
*/
unsigned int interaction_;
/**
* Interactions allowed in the shower
*/
vector<ShowerInteraction::Type> interactions_;
/**
* Truncated shower switch
*/
bool _trunc_Mode;
/**
* Count of the number of truncated emissions
*/
unsigned int _truncEmissions;
/**
* Mode for the hard emissions
*/
unsigned int _hardEmissionMode;
/**
* Colour evolution method
*/
int _colourEvolutionMethod;
/**
* A factor to multiply the hard veto scale
*/
double _hardScaleFactor;
/**
* Option to include spin correlations
*/
unsigned int _spinOpt;
+ /**
+ * Option for the kernal for soft correlations
+ */
+ unsigned int _softOpt;
+
};
}
#endif /* HERWIG_Evolver_H */
diff --git a/Shower/Default/QTildeSudakov.cc b/Shower/Default/QTildeSudakov.cc
--- a/Shower/Default/QTildeSudakov.cc
+++ b/Shower/Default/QTildeSudakov.cc
@@ -1,868 +1,926 @@
// -*- C++ -*-
//
// QTildeSudakov.cc is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2011 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
//
// This is the implementation of the non-inlined, non-templated member
// functions of the QTildeSudakov class.
//
#include "QTildeSudakov.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Interface/Parameter.h"
#include "ThePEG/Interface/Switch.h"
#include "ThePEG/PDT/ParticleData.h"
#include "ThePEG/EventRecord/Event.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/PDT/EnumParticles.h"
#include "Herwig++/Shower/Default/FS_QTildeShowerKinematics1to2.h"
#include "Herwig++/Shower/Default/IS_QTildeShowerKinematics1to2.h"
#include "Herwig++/Shower/Default/Decay_QTildeShowerKinematics1to2.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "Herwig++/Shower/Base/ShowerVertex.h"
#include "Herwig++/Shower/Base/ShowerParticle.h"
#include "Herwig++/Shower/ShowerHandler.h"
#include "Herwig++/Shower/Base/Evolver.h"
#include "Herwig++/Shower/Base/PartnerFinder.h"
#include "Herwig++/Shower/Base/ShowerModel.h"
#include "Herwig++/Shower/Base/KinematicsReconstructor.h"
using namespace Herwig;
DescribeNoPIOClass<QTildeSudakov,Herwig::SudakovFormFactor>
describeQTildeSudakov ("Herwig::QTildeSudakov","HwShower.so");
void QTildeSudakov::Init() {
static ClassDocumentation<QTildeSudakov> documentation
("The QTildeSudakov class implements the Sudakov form factor for ordering it"
" qtilde");
}
bool QTildeSudakov::guessTimeLike(Energy2 &t,Energy2 tmin,double enhance) {
Energy2 told = t;
// calculate limits on z and if lower>upper return
if(!computeTimeLikeLimits(t)) return false;
// guess values of t and z
t = guesst(told,0,ids_,enhance,ids_[1]==ids_[2]);
z(guessz(0,ids_));
// actual values for z-limits
if(!computeTimeLikeLimits(t)) return false;
if(t<tmin) {
t=-1.0*GeV2;
return false;
}
else
return true;
}
bool QTildeSudakov::guessSpaceLike(Energy2 &t, Energy2 tmin, const double x,
double enhance) {
Energy2 told = t;
// calculate limits on z if lower>upper return
if(!computeSpaceLikeLimits(t,x)) return false;
// guess values of t and z
t = guesst(told,1,ids_,enhance,ids_[1]==ids_[2]);
z(guessz(1,ids_));
// actual values for z-limits
if(!computeSpaceLikeLimits(t,x)) return false;
if(t<tmin) {
t=-1.0*GeV2;
return false;
}
else
return true;
}
bool QTildeSudakov::PSVeto(const Energy2 t) {
// still inside PS, return true if outside
// check vs overestimated limits
if(z() < zLimits().first || z() > zLimits().second) return true;
// compute the pts
Energy2 pt2=sqr(z()*(1.-z()))*t-masssquared_[1]*(1.-z())-masssquared_[2]*z();
if(ids_[0]!=ParticleID::g) pt2+=z()*(1.-z())*masssquared_[0];
// if pt2<0 veto
if(pt2<pT2min()) return true;
// otherwise calculate pt and return
pT(sqrt(pt2));
return false;
}
ShoKinPtr QTildeSudakov::generateNextTimeBranching(const Energy startingScale,
const IdList &ids,const bool cc,
double enhance) {
// First reset the internal kinematics variables that can
// have been eventually set in the previous call to the method.
q_ = ZERO;
z(0.);
phi(0.);
// perform initialization
Energy2 tmax(sqr(startingScale)),tmin;
initialize(ids,tmin,cc);
// check max > min
if(tmax<=tmin) return ShoKinPtr();
// calculate next value of t using veto algorithm
Energy2 t(tmax);
do {
if(!guessTimeLike(t,tmin,enhance)) break;
}
while(PSVeto(t) || SplittingFnVeto(z()*(1.-z())*t,ids,true) ||
alphaSVeto(sqr(z()*(1.-z()))*t));
q_ = t > ZERO ? Energy(sqrt(t)) : -1.*MeV;
if(q_ < ZERO) return ShoKinPtr();
// return the ShowerKinematics object
return createFinalStateBranching(q_,z(),phi(),pT());
}
ShoKinPtr QTildeSudakov::
generateNextSpaceBranching(const Energy startingQ,
const IdList &ids,
double x,bool cc,
double enhance,
Ptr<BeamParticleData>::transient_const_pointer beam) {
// First reset the internal kinematics variables that can
// have been eventually set in the previous call to the method.
q_ = ZERO;
z(0.);
phi(0.);
// perform the initialization
Energy2 tmax(sqr(startingQ)),tmin;
initialize(ids,tmin,cc);
// check max > min
if(tmax<=tmin) return ShoKinPtr();
// extract the partons which are needed for the PDF veto
// Different order, incoming parton is id = 1, outgoing are id=0,2
tcPDPtr parton0 = getParticleData(ids[0]);
tcPDPtr parton1 = getParticleData(ids[1]);
if(cc) {
if(parton0->CC()) parton0 = parton0->CC();
if(parton1->CC()) parton1 = parton1->CC();
}
// calculate next value of t using veto algorithm
Energy2 t(tmax),pt2(ZERO);
do {
if(!guessSpaceLike(t,tmin,x,enhance)) break;
pt2=sqr(1.-z())*t-z()*masssquared_[2];
}
while(z() > zLimits().second ||
SplittingFnVeto((1.-z())*t/z(),ids,true) ||
alphaSVeto(sqr(1.-z())*t) ||
PDFVeto(t,x,parton0,parton1,beam) || pt2 < pT2min() );
if(t > ZERO && zLimits().first < zLimits().second) q_ = sqrt(t);
else return ShoKinPtr();
pT(sqrt(pt2));
// create the ShowerKinematics and return it
return createInitialStateBranching(q_,z(),phi(),pT());
}
void QTildeSudakov::initialize(const IdList & ids, Energy2 & tmin,const bool cc) {
ids_=ids;
if(cc) {
for(unsigned int ix=0;ix<ids.size();++ix) {
if(getParticleData(ids[ix])->CC()) ids_[ix]*=-1;
}
}
tmin = cutOffOption() != 2 ? ZERO : 4.*pT2min();
masses_ = virtualMasses(ids);
masssquared_.clear();
for(unsigned int ix=0;ix<masses_.size();++ix) {
masssquared_.push_back(sqr(masses_[ix]));
if(ix>0) tmin=max(masssquared_[ix],tmin);
}
}
ShoKinPtr QTildeSudakov::generateNextDecayBranching(const Energy startingScale,
const Energy stoppingScale,
const Energy minmass,
const IdList &ids,
const bool cc,
double enhance) {
// First reset the internal kinematics variables that can
// have been eventually set in the previous call to this method.
q_ = Constants::MaxEnergy;
z(0.);
phi(0.);
// perform initialisation
Energy2 tmax(sqr(stoppingScale)),tmin;
initialize(ids,tmin,cc);
tmin=sqr(startingScale);
// check some branching possible
if(tmax<=tmin) return ShoKinPtr();
// perform the evolution
Energy2 t(tmin),pt2(-MeV2);
do {
if(!guessDecay(t,tmax,minmass,enhance)) break;
pt2 = sqr(1.-z())*(t-masssquared_[0])-z()*masssquared_[2];
}
while(SplittingFnVeto((1.-z())*t/z(),ids,true)||
alphaSVeto(sqr(1.-z())*t) ||
pt2<pT2min() ||
t*(1.-z())>masssquared_[0]-sqr(minmass));
if(t > ZERO) {
q_ = sqrt(t);
pT(sqrt(pt2));
}
else return ShoKinPtr();
phi(0.);
// create the ShowerKinematics object
return createDecayBranching(q_,z(),phi(),pT());
}
bool QTildeSudakov::guessDecay(Energy2 &t,Energy2 tmax, Energy minmass,
double enhance) {
// previous scale
Energy2 told = t;
// overestimated limits on z
if(tmax<masssquared_[0]) {
t=-1.0*GeV2;
return false;
}
Energy2 tm2 = tmax-masssquared_[0];
Energy tm = sqrt(tm2);
pair<double,double> limits=make_pair(sqr(minmass/masses_[0]),
1.-sqrt(masssquared_[2]+pT2min()+
0.25*sqr(masssquared_[2])/tm2)/tm
+0.5*masssquared_[2]/tm2);
zLimits(limits);
if(zLimits().second<zLimits().first) {
t=-1.0*GeV2;
return false;
}
// guess values of t and z
t = guesst(told,2,ids_,enhance,ids_[1]==ids_[2]);
z(guessz(2,ids_));
// actual values for z-limits
if(t<masssquared_[0]) {
t=-1.0*GeV2;
return false;
}
tm2 = t-masssquared_[0];
tm = sqrt(tm2);
limits=make_pair(sqr(minmass/masses_[0]),
1.-sqrt(masssquared_[2]+pT2min()+
0.25*sqr(masssquared_[2])/tm2)/tm
+0.5*masssquared_[2]/tm2);
zLimits(limits);
if(t>tmax||zLimits().second<zLimits().first) {
t=-1.0*GeV2;
return false;
}
else
return true;
}
bool QTildeSudakov::computeTimeLikeLimits(Energy2 & t) {
if (t < 1e-20 * GeV2) {
t=-1.*GeV2;
return false;
}
// special case for gluon radiating
pair<double,double> limits;
if(ids_[0]==ParticleID::g||ids_[0]==ParticleID::gamma) {
// no emission possible
if(t<16.*masssquared_[1]) {
t=-1.*GeV2;
return false;
}
// overestimate of the limits
limits.first = 0.5*(1.-sqrt(1.-4.*sqrt((masssquared_[1]+pT2min())/t)));
limits.second = 1.-limits.first;
}
// special case for radiated particle is gluon
else if(ids_[2]==ParticleID::g||ids_[2]==ParticleID::gamma) {
limits.first = sqrt((masssquared_[1]+pT2min())/t);
limits.second = 1.-sqrt((masssquared_[2]+pT2min())/t);
}
else if(ids_[1]==ParticleID::g||ids_[1]==ParticleID::gamma) {
limits.second = sqrt((masssquared_[2]+pT2min())/t);
limits.first = 1.-sqrt((masssquared_[1]+pT2min())/t);
}
else {
limits.first = (masssquared_[1]+pT2min())/t;
limits.second = 1.-(masssquared_[2]+pT2min())/t;
}
if(limits.first>=limits.second) {
t=-1.*GeV2;
return false;
}
zLimits(limits);
return true;
}
bool QTildeSudakov::computeSpaceLikeLimits(Energy2 & t, double x) {
if (t < 1e-20 * GeV2) {
t=-1.*GeV2;
return false;
}
pair<double,double> limits;
// compute the limits
limits.first = x;
double yy = 1.+0.5*masssquared_[2]/t;
limits.second = yy - sqrt(sqr(yy)-1.+pT2min()/t);
// return false if lower>upper
zLimits(limits);
if(limits.second<limits.first) {
t=-1.*GeV2;
return false;
}
else
return true;
}
namespace {
tShowerParticlePtr findCorrelationPartner(ShowerParticle & particle,
bool forward,
ShowerInteraction::Type inter) {
tPPtr child = &particle;
tPPtr mother;
if(forward) {
mother = !particle.parents().empty() ? particle.parents()[0] : tPPtr();
}
else {
mother = particle.children().size()==2 ? &particle : tPPtr();
}
tShowerParticlePtr partner;
while(mother) {
tPPtr otherChild;
if(forward) {
for (unsigned int ix=0;ix<mother->children().size();++ix) {
if(mother->children()[ix]!=child) {
otherChild = mother->children()[ix];
break;
}
}
}
else {
otherChild = mother->children()[1];
}
tShowerParticlePtr other = dynamic_ptr_cast<tShowerParticlePtr>(otherChild);
if((inter==ShowerInteraction::QCD && otherChild->dataPtr()->coloured()) ||
(inter==ShowerInteraction::QED && otherChild->dataPtr()->charged())) {
partner = other;
break;
}
if(forward && !other->isFinalState()) {
partner = dynamic_ptr_cast<tShowerParticlePtr>(mother);
break;
}
child = mother;
if(forward) {
mother = ! mother->parents().empty() ? mother->parents()[0] : tPPtr();
}
else {
if(mother->children()[0]->children().size()!=2)
break;
mother = mother->children()[0];
}
}
if(!partner) {
if(forward) {
partner = dynamic_ptr_cast<tShowerParticlePtr>( child)->partner();
}
else {
if(mother) {
tShowerParticlePtr parent;
if(!mother->children().empty()) {
parent = dynamic_ptr_cast<tShowerParticlePtr>(mother->children()[0]);
}
if(!parent) {
parent = dynamic_ptr_cast<tShowerParticlePtr>(mother);
}
partner = parent->partner();
}
else {
partner = dynamic_ptr_cast<tShowerParticlePtr>(&particle)->partner();
}
}
}
return partner;
}
}
double QTildeSudakov::generatePhiForward(ShowerParticle & particle,
const IdList & ids,
ShoKinPtr kinematics) {
// no correlations, return flat phi
if(! ShowerHandler::currentHandler()->evolver()->correlations())
return Constants::twopi*UseRandom::rnd();
// get the kinematic variables
double z = kinematics->z();
Energy2 t = z*(1.-z)*sqr(kinematics->scale());
Energy pT = kinematics->pT();
// if soft correlations
Energy2 pipj,pik;
bool canBeSoft[2] = {ids[1]==ParticleID::g || ids[1]==ParticleID::gamma,
ids[2]==ParticleID::g || ids[2]==ParticleID::gamma };
vector<Energy2> pjk(3,ZERO);
+ vector<Energy> Ek(3,ZERO);
+ Energy Ei,Ej;
Energy2 m12(ZERO),m22(ZERO);
InvEnergy2 aziMax(ZERO);
bool softAllowed = ShowerHandler::currentHandler()->evolver()->softCorrelations()&&
(canBeSoft[0] || canBeSoft[1]);
bool swapOrder;
if(softAllowed) {
// find the partner for the soft correlations
tShowerParticlePtr partner=findCorrelationPartner(particle,true,splittingFn()->interactionType());
// remember we want the softer gluon
swapOrder = !canBeSoft[1] || (canBeSoft[0] && canBeSoft[1] && z < 0.5);
double zFact = !swapOrder ? (1.-z) : z;
// compute the transforms to the shower reference frame
// first the boost
vector<Lorentz5Momentum> basis = kinematics->getBasis();
Lorentz5Momentum pVect = basis[0];
Lorentz5Momentum nVect = basis[1];
Boost beta_bb;
if(kinematics->frame()==ShowerKinematics::BackToBack) {
beta_bb = -(pVect + nVect).boostVector();
}
else if(kinematics->frame()==ShowerKinematics::Rest) {
beta_bb = -pVect.boostVector();
}
else
assert(false);
pVect.boost(beta_bb);
nVect.boost(beta_bb);
Axis axis;
if(kinematics->frame()==ShowerKinematics::BackToBack) {
axis = pVect.vect().unit();
}
else if(kinematics->frame()==ShowerKinematics::Rest) {
axis = nVect.vect().unit();
}
else
assert(false);
// and then the rotation
LorentzRotation rot;
if(axis.perp2()>0.) {
double sinth(sqrt(sqr(axis.x())+sqr(axis.y())));
rot.rotate(acos(axis.z()),Axis(-axis.y()/sinth,axis.x()/sinth,0.));
}
else if(axis.z()<0.) {
rot.rotate(Constants::pi,Axis(1.,0.,0.));
}
rot.invert();
pVect *= rot;
nVect *= rot;
// shower parameters
Energy2 pn = pVect*nVect;
Energy2 m2 = pVect.m2();
double alpha0 = particle.showerParameters().alpha;
double beta0 = 0.5/alpha0/pn*
(sqr(particle.dataPtr()->mass())-sqr(alpha0)*m2+sqr(particle.showerParameters().pt));
Lorentz5Momentum qperp0(particle.showerParameters().ptx,
particle.showerParameters().pty,ZERO,ZERO);
assert(partner);
Lorentz5Momentum pj = partner->momentum();
pj.boost(beta_bb);
pj *= rot;
// compute the two phi independent dot products
pik = 0.5*zFact*(sqr(alpha0)*m2 - sqr(particle.showerParameters().pt) + 2.*alpha0*beta0*pn )
+0.5*sqr(pT)/zFact;
Energy2 dot1 = pj*pVect;
Energy2 dot2 = pj*nVect;
Energy2 dot3 = pj*qperp0;
pipj = alpha0*dot1+beta0*dot2+dot3;
// compute the constants for the phi dependent dot product
pjk[0] = zFact*(alpha0*dot1+dot3-0.5*dot2/pn*(alpha0*m2-sqr(particle.showerParameters().pt)/alpha0))
+0.5*sqr(pT)*dot2/pn/zFact/alpha0;
pjk[1] = (pj.x() - dot2/alpha0/pn*qperp0.x())*pT;
pjk[2] = (pj.y() - dot2/alpha0/pn*qperp0.y())*pT;
m12 = sqr(particle.dataPtr()->mass());
m22 = sqr(partner->dataPtr()->mass());
if(swapOrder) {
pjk[1] *= -1.;
pjk[2] *= -1.;
}
Energy2 mag = sqrt(sqr(pjk[1])+sqr(pjk[2]));
- aziMax = -m12/sqr(pik) -m22/sqr(pjk[0]+mag) +2.*pipj/pik/(pjk[0]-mag);
+ if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==1) {
+ aziMax = -m12/sqr(pik) -m22/sqr(pjk[0]+mag) +2.*pipj/pik/(pjk[0]-mag);
+ }
+ else if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==2) {
+ Ek[0] = zFact*(alpha0*pVect.t()-0.5*nVect.t()/pn*(alpha0*m2-sqr(particle.showerParameters().pt)/alpha0))
+ +0.5*sqr(pT)*nVect.t()/pn/zFact/alpha0;
+ Ek[1] = -nVect.t()/alpha0/pn*qperp0.x()*pT;
+ Ek[2] = -nVect.t()/alpha0/pn*qperp0.y()*pT;
+ if(swapOrder) {
+ Ek[1] *= -1.;
+ Ek[2] *= -1.;
+ }
+ Energy mag2=sqrt(sqr(Ek[1])+sqr(Ek[2]));
+ Ei = alpha0*pVect.t()+beta0*nVect.t();
+ Ej = pj.t();
+ aziMax = 0.5/pik/(Ek[0]-mag2)*(Ei-m12*(Ek[0]-mag2)/pik + pipj*(Ek[0]+mag2)/(pjk[0]-mag) - Ej*pik/(pjk[0]-mag) );
+ }
+ else
+ assert(ShowerHandler::currentHandler()->evolver()->softCorrelations()==0);
}
// if spin correlations
vector<pair<int,Complex> > wgts;
if(ShowerHandler::currentHandler()->evolver()->spinCorrelations()) {
// get the spin density matrix and the mapping
RhoDMatrix mapping;
SpinPtr inspin;
bool needMapping = getMapping(inspin,mapping,particle,kinematics);
// set the decayed flag
inspin->decay();
// get the spin density matrix
RhoDMatrix rho=inspin->rhoMatrix();
// map to the shower basis if needed
if(needMapping) {
RhoDMatrix rhop(rho.iSpin(),false);
for(int ixa=0;ixa<rho.iSpin();++ixa) {
for(int ixb=0;ixb<rho.iSpin();++ixb) {
for(int iya=0;iya<rho.iSpin();++iya) {
for(int iyb=0;iyb<rho.iSpin();++iyb) {
rhop(ixa,ixb) += rho(iya,iyb)*mapping(iya,ixa)*conj(mapping(iyb,ixb));
}
}
}
}
rhop.normalize();
rho = rhop;
}
// calculate the weights
wgts = splittingFn()->generatePhiForward(z,t,ids,rho);
}
else {
wgts = vector<pair<int,Complex> >(1,make_pair(0,1.));
}
// generate the azimuthal angle
double phi,wgt;
static const Complex ii(0.,1.);
unsigned int ntry(0);
double phiMax(0.),wgtMax(0.);
do {
phi = Constants::twopi*UseRandom::rnd();
// first the spin correlations bit (gives 1 if correlations off)
Complex spinWgt = 0.;
for(unsigned int ix=0;ix<wgts.size();++ix) {
if(wgts[ix].first==0)
spinWgt += wgts[ix].second;
else
spinWgt += exp(double(wgts[ix].first)*ii*phi)*wgts[ix].second;
}
wgt = spinWgt.real();
if(wgt-1.>1e-10) {
generator()->log() << "Forward spin weight problem " << wgt << " " << wgt-1.
<< " " << ids[0] << " " << ids[1] << " " << ids[2] << " " << " " << phi << "\n";
generator()->log() << "Weights \n";
for(unsigned int ix=0;ix<wgts.size();++ix)
generator()->log() << wgts[ix].first << " " << wgts[ix].second << "\n";
}
// soft correlations bit
double aziWgt = 1.;
if(softAllowed) {
Energy2 dot = pjk[0]+pjk[1]*cos(phi)+pjk[2]*sin(phi);
- aziWgt = (-m12/sqr(pik) -m22/sqr(dot) +2.*pipj/pik/dot)/aziMax;
+ if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==1) {
+ aziWgt = (-m12/sqr(pik) -m22/sqr(dot) +2.*pipj/pik/dot)/aziMax;
+ }
+ else if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==2) {
+ Energy Eg = Ek[0]+Ek[1]*cos(phi)+Ek[2]*sin(phi);
+ aziWgt = 0.5/pik/Eg*(Ei-m12*Eg/pik + pipj*Eg/dot - Ej*pik/dot)/aziMax;
+ }
if(aziWgt-1.>1e-10||aziWgt<-1e-10) {
generator()->log() << "Forward soft weight problem " << aziWgt << " " << aziWgt-1.
<< " " << ids[0] << " " << ids[1] << " " << ids[2] << " " << " " << phi << "\n";
}
}
wgt *= aziWgt;
if(wgt>wgtMax) {
phiMax = phi;
wgtMax = wgt;
}
++ntry;
}
while(wgt<UseRandom::rnd()&&ntry<10000);
if(ntry==10000) {
phi = phiMax;
generator()->log() << "Too many tries to generate phi in forward evolution\n";
}
// return the azimuthal angle
return phi;
}
double QTildeSudakov::generatePhiBackward(ShowerParticle & particle,
const IdList & ids,
ShoKinPtr kinematics) {
// no correlations, return flat phi
if(! ShowerHandler::currentHandler()->evolver()->correlations())
return Constants::twopi*UseRandom::rnd();
// get the kinematic variables
double z = kinematics->z();
Energy2 t = (1.-z)*sqr(kinematics->scale())/z;
Energy pT = kinematics->pT();
// if soft correlations
- bool softAllowed = ShowerHandler::currentHandler()->evolver()->softCorrelations()&&
+ bool softAllowed = ShowerHandler::currentHandler()->evolver()->softCorrelations() &&
(ids[2]==ParticleID::g || ids[2]==ParticleID::gamma);
Energy2 pipj,pik,m12(ZERO),m22(ZERO);
vector<Energy2> pjk(3,ZERO);
+ Energy Ei,Ej,Ek;
InvEnergy2 aziMax(ZERO);
if(softAllowed) {
// find the partner for the soft correlations
tShowerParticlePtr partner=findCorrelationPartner(particle,false,splittingFn()->interactionType());
double zFact = (1.-z);
// compute the transforms to the shower reference frame
// first the boost
vector<Lorentz5Momentum> basis = kinematics->getBasis();
Lorentz5Momentum pVect = basis[0];
Lorentz5Momentum nVect = basis[1];
assert(kinematics->frame()==ShowerKinematics::BackToBack);
Boost beta_bb = -(pVect + nVect).boostVector();
pVect.boost(beta_bb);
nVect.boost(beta_bb);
Axis axis = pVect.vect().unit();
// and then the rotation
LorentzRotation rot;
if(axis.perp2()>0.) {
double sinth(sqrt(sqr(axis.x())+sqr(axis.y())));
rot.rotate(acos(axis.z()),Axis(-axis.y()/sinth,axis.x()/sinth,0.));
}
else if(axis.z()<0.) {
rot.rotate(Constants::pi,Axis(1.,0.,0.));
}
rot.invert();
pVect *= rot;
nVect *= rot;
// shower parameters
Energy2 pn = pVect*nVect;
Energy2 m2 = pVect.m2();
double alpha0 = particle.x();
double beta0 = -0.5/alpha0/pn*sqr(alpha0)*m2;
Lorentz5Momentum pj = partner->momentum();
pj.boost(beta_bb);
pj *= rot;
double beta2 = 0.5*(1.-zFact)*(sqr(alpha0*zFact/(1.-zFact))*m2+sqr(pT))/alpha0/zFact/pn;
// compute the two phi independent dot products
Energy2 dot1 = pj*pVect;
Energy2 dot2 = pj*nVect;
pipj = alpha0*dot1+beta0*dot2;
pik = alpha0*(alpha0*zFact/(1.-zFact)*m2+pn*(beta2+zFact/(1.-zFact)*beta0));
// compute the constants for the phi dependent dot product
pjk[0] = alpha0*zFact/(1.-zFact)*dot1+beta2*dot2;
pjk[1] = pj.x()*pT;
pjk[2] = pj.y()*pT;
m12 = ZERO;
m22 = sqr(partner->dataPtr()->mass());
Energy2 mag = sqrt(sqr(pjk[1])+sqr(pjk[2]));
- aziMax = -m12/sqr(pik) -m22/sqr(pjk[0]+mag) +2.*pipj/pik/(pjk[0]-mag);
+ if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==1) {
+ aziMax = -m12/sqr(pik) -m22/sqr(pjk[0]+mag) +2.*pipj/pik/(pjk[0]-mag);
+ }
+ else if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==2) {
+ Ek = alpha0*zFact/(1.-zFact)*pVect.t()+beta2*nVect.t();
+ Ei = alpha0*pVect.t()+beta0*nVect.t();
+ Ej = pj.t();
+ aziMax = 0.5/pik/Ek*(Ei-m12*Ek/pik + pipj*Ek/(pjk[0]-mag) - Ej*pik/(pjk[0]-mag));
+ }
+ else {
+ assert(ShowerHandler::currentHandler()->evolver()->softCorrelations()==0);
+ }
}
// if spin correlations
vector<pair<int,Complex> > wgts;
if(ShowerHandler::currentHandler()->evolver()->spinCorrelations()) {
// get the spin density matrix and the mapping
RhoDMatrix mapping;
SpinPtr inspin;
bool needMapping = getMapping(inspin,mapping,particle,kinematics);
// set the decayed flag (counterintuitive but going backward)
inspin->decay();
// get the spin density matrix
RhoDMatrix rho=inspin->DMatrix();
// map to the shower basis if needed
if(needMapping) {
RhoDMatrix rhop(rho.iSpin(),false);
for(int ixa=0;ixa<rho.iSpin();++ixa) {
for(int ixb=0;ixb<rho.iSpin();++ixb) {
for(int iya=0;iya<rho.iSpin();++iya) {
for(int iyb=0;iyb<rho.iSpin();++iyb) {
rhop(ixa,ixb) += rho(iya,iyb)*mapping(iya,ixa)*conj(mapping(iyb,ixb));
}
}
}
}
rhop.normalize();
rho = rhop;
}
wgts = splittingFn()->generatePhiBackward(z,t,ids,rho);
}
else {
wgts = vector<pair<int,Complex> >(1,make_pair(0,1.));
}
// generate the azimuthal angle
double phi,wgt;
static const Complex ii(0.,1.);
unsigned int ntry(0);
double phiMax(0.),wgtMax(0.);
do {
phi = Constants::twopi*UseRandom::rnd();
Complex spinWgt = 0.;
for(unsigned int ix=0;ix<wgts.size();++ix) {
if(wgts[ix].first==0)
spinWgt += wgts[ix].second;
else
spinWgt += exp(double(wgts[ix].first)*ii*phi)*wgts[ix].second;
}
wgt = spinWgt.real();
if(wgt-1.>1e-10) {
generator()->log() << "Backward weight problem " << wgt << " " << wgt-1.
<< " " << ids[0] << " " << ids[1] << " " << ids[2] << " " << " " << z << " " << phi << "\n";
generator()->log() << "Weights \n";
for(unsigned int ix=0;ix<wgts.size();++ix)
generator()->log() << wgts[ix].first << " " << wgts[ix].second << "\n";
}
// soft correlations bit
double aziWgt = 1.;
if(softAllowed) {
Energy2 dot = pjk[0]+pjk[1]*cos(phi)+pjk[2]*sin(phi);
- aziWgt = (-m12/sqr(pik) -m22/sqr(dot) +2.*pipj/pik/dot)/aziMax;
+ if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==1) {
+ aziWgt = (-m12/sqr(pik) -m22/sqr(dot) +2.*pipj/pik/dot)/aziMax;
+ }
+ else if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==2) {
+ aziWgt = 0.5/pik/Ek*(Ei-m12*Ek/pik + pipj*Ek/dot - Ej*pik/dot)/aziMax;
+ }
if(aziWgt-1.>1e-10||aziWgt<-1e-10) {
generator()->log() << "Forward soft weight problem " << aziWgt << " " << aziWgt-1.
<< " " << ids[0] << " " << ids[1] << " " << ids[2] << " " << " " << phi << "\n";
}
}
wgt *= aziWgt;
if(wgt>wgtMax) {
phiMax = phi;
wgtMax = wgt;
}
++ntry;
}
while(wgt<UseRandom::rnd()&&ntry<10000);
if(ntry==10000) {
phi = phiMax;
generator()->log() << "Too many tries to generate phi in backward evolution\n";
}
// return the azimuthal angle
return phi;
}
double QTildeSudakov::generatePhiDecay(ShowerParticle & particle,
const IdList & ids,
ShoKinPtr kinematics) {
// only soft correlations in this case
- bool canBeSoft[2] = {ids[1]==ParticleID::g || ids[1]==ParticleID::gamma,
- ids[2]==ParticleID::g || ids[2]==ParticleID::gamma };
// no correlations, return flat phi
- if( ! (ShowerHandler::currentHandler()->evolver()->softCorrelations()&&
- (canBeSoft[0] || canBeSoft[1]) ) )
+ if( !(ShowerHandler::currentHandler()->evolver()->softCorrelations() &&
+ (ids[2]==ParticleID::g || ids[2]==ParticleID::gamma )))
return Constants::twopi*UseRandom::rnd();
// get the kinematic variables
double z = kinematics->z();
Energy pT = kinematics->pT();
// if soft correlations
// find the partner for the soft correlations
tShowerParticlePtr partner = findCorrelationPartner(particle,true,splittingFn()->interactionType());
- // remember we want the softer gluon
- bool swapOrder = !canBeSoft[1] || (canBeSoft[0] && canBeSoft[1] && z < 0.5);
- double zFact = !swapOrder ? (1.-z) : z;
+ double zFact(1.-z);
vector<Lorentz5Momentum> basis = kinematics->getBasis();
// compute the transforms to the shower reference frame
// first the boost
Lorentz5Momentum pVect = basis[0];
Lorentz5Momentum nVect = basis[1];
- assert(kinematics->frame()==ShowerKinematics::Rest);
+ assert(kinematics->frame()==ShowerKinematics::Rest);
Boost beta_bb = -pVect.boostVector();
pVect.boost(beta_bb);
nVect.boost(beta_bb);
Axis axis = nVect.vect().unit();
// and then the rotation
LorentzRotation rot;
if(axis.perp2()>0.) {
double sinth(sqrt(sqr(axis.x())+sqr(axis.y())));
rot.rotate(acos(axis.z()),Axis(-axis.y()/sinth,axis.x()/sinth,0.));
}
else if(axis.z()<0.) {
rot.rotate(Constants::pi,Axis(1.,0.,0.));
}
rot.invert();
pVect *= rot;
nVect *= rot;
// shower parameters
Energy2 pn = pVect*nVect;
Energy2 m2 = pVect.m2();
double alpha0 = particle.showerParameters().alpha;
double beta0 = 0.5/alpha0/pn*
(sqr(particle.dataPtr()->mass())-sqr(alpha0)*m2+sqr(particle.showerParameters().pt));
Lorentz5Momentum qperp0(particle.showerParameters().ptx,
particle.showerParameters().pty,ZERO,ZERO);
Lorentz5Momentum pj = partner->momentum();
pj.boost(beta_bb);
pj *= rot;
// compute the two phi independent dot products
Energy2 pik = 0.5*zFact*(sqr(alpha0)*m2 - sqr(particle.showerParameters().pt) + 2.*alpha0*beta0*pn )
+0.5*sqr(pT)/zFact;
Energy2 dot1 = pj*pVect;
Energy2 dot2 = pj*nVect;
Energy2 dot3 = pj*qperp0;
Energy2 pipj = alpha0*dot1+beta0*dot2+dot3;
// compute the constants for the phi dependent dot product
vector<Energy2> pjk(3,ZERO);
pjk[0] = zFact*(alpha0*dot1+dot3-0.5*dot2/pn*(alpha0*m2-sqr(particle.showerParameters().pt)/alpha0))
+0.5*sqr(pT)*dot2/pn/zFact/alpha0;
pjk[1] = (pj.x() - dot2/alpha0/pn*qperp0.x())*pT;
pjk[2] = (pj.y() - dot2/alpha0/pn*qperp0.y())*pT;
Energy2 m12 = sqr(particle.dataPtr()->mass());
Energy2 m22 = sqr(partner->dataPtr()->mass());
- if(swapOrder) {
- pjk[1] *= -1.;
- pjk[2] *= -1.;
+ Energy2 mag = sqrt(sqr(pjk[1])+sqr(pjk[2]));
+ InvEnergy2 aziMax;
+ vector<Energy> Ek(3,ZERO);
+ Energy Ei,Ej;
+ if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==1) {
+ aziMax = -m12/sqr(pik) -m22/sqr(pjk[0]+mag) +2.*pipj/pik/(pjk[0]-mag);
}
- Energy2 mag = sqrt(sqr(pjk[1])+sqr(pjk[2]));
- InvEnergy2 aziMax = -m12/sqr(pik) -m22/sqr(pjk[0]+mag) +2.*pipj/pik/(pjk[0]-mag);
+ else if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==2) {
+ Ek[0] = zFact*(alpha0*pVect.t()+-0.5*nVect.t()/pn*(alpha0*m2-sqr(particle.showerParameters().pt)/alpha0))
+ +0.5*sqr(pT)*nVect.t()/pn/zFact/alpha0;
+ Ek[1] = -nVect.t()/alpha0/pn*qperp0.x()*pT;
+ Ek[2] = -nVect.t()/alpha0/pn*qperp0.y()*pT;
+ Energy mag2=sqrt(sqr(Ek[1])+sqr(Ek[2]));
+ Ei = alpha0*pVect.t()+beta0*nVect.t();
+ Ej = pj.t();
+ aziMax = 0.5/pik/(Ek[0]-mag2)*(Ei-m12*(Ek[0]-mag2)/pik + pipj*(Ek[0]+mag2)/(pjk[0]-mag) - Ej*pik/(pjk[0]-mag) );
+ }
+ else
+ assert(ShowerHandler::currentHandler()->evolver()->softCorrelations()==0);
// generate the azimuthal angle
- double phi,wgt;
+ double phi,wgt(0.);
unsigned int ntry(0);
double phiMax(0.),wgtMax(0.);
do {
phi = Constants::twopi*UseRandom::rnd();
Energy2 dot = pjk[0]+pjk[1]*cos(phi)+pjk[2]*sin(phi);
- wgt = (-m12/sqr(pik) -m22/sqr(dot) +2.*pipj/pik/dot)/aziMax;
+ if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==1) {
+ wgt = (-m12/sqr(pik) -m22/sqr(dot) +2.*pipj/pik/dot)/aziMax;
+ }
+ else if(ShowerHandler::currentHandler()->evolver()->softCorrelations()==2) {
+ Energy Eg = Ek[0]+Ek[1]*cos(phi)+Ek[2]*sin(phi);
+ wgt = 0.5/pik/Eg*(Ei-m12*Eg/pik + pipj*Eg/dot - Ej*pik/dot)/aziMax;
+ }
if(wgt-1.>1e-10||wgt<-1e-10) {
generator()->log() << "Decay soft weight problem " << wgt << " " << wgt-1.
<< " " << ids[0] << " " << ids[1] << " " << ids[2] << " " << " " << phi << "\n";
}
if(wgt>wgtMax) {
phiMax = phi;
wgtMax = wgt;
}
++ntry;
}
while(wgt<UseRandom::rnd()&&ntry<10000);
if(ntry==10000) {
phi = phiMax;
generator()->log() << "Too many tries to generate phi\n";
}
// return the azimuthal angle
return phi;
}
Energy QTildeSudakov::calculateScale(double zin, Energy pt, IdList ids,
unsigned int iopt) {
Energy2 tmin;
initialize(ids,tmin,false);
// final-state branching
if(iopt==0) {
Energy2 scale=(sqr(pt)+masssquared_[1]*(1.-zin)+masssquared_[2]*zin);
if(ids[0]!=ParticleID::g) scale -= zin*(1.-zin)*masssquared_[0];
scale /= sqr(zin*(1-zin));
return scale<=ZERO ? sqrt(tmin) : sqrt(scale);
}
else if(iopt==1) {
Energy2 scale=(sqr(pt)+zin*masssquared_[2])/sqr(1.-zin);
return scale<=ZERO ? sqrt(tmin) : sqrt(scale);
}
else if(iopt==2) {
Energy2 scale = (sqr(pt)+zin*masssquared_[2])/sqr(1.-zin)+masssquared_[0];
return scale<=ZERO ? sqrt(tmin) : sqrt(scale);
}
else {
throw Exception() << "Unknown option in QTildeSudakov::calculateScale() "
<< "iopt = " << iopt << Exception::runerror;
}
}
ShoKinPtr QTildeSudakov::createFinalStateBranching(Energy scale,double z,
double phi, Energy pt) {
ShoKinPtr showerKin = new_ptr(FS_QTildeShowerKinematics1to2());
showerKin->scale(scale);
showerKin->z(z);
showerKin->phi(phi);
showerKin->pT(pt);
showerKin->SudakovFormFactor(this);
return showerKin;
}
ShoKinPtr QTildeSudakov::createInitialStateBranching(Energy scale,double z,
double phi, Energy pt) {
ShoKinPtr showerKin = new_ptr(IS_QTildeShowerKinematics1to2());
showerKin->scale(scale);
showerKin->z(z);
showerKin->phi(phi);
showerKin->pT(pt);
showerKin->SudakovFormFactor(this);
return showerKin;
}
ShoKinPtr QTildeSudakov::createDecayBranching(Energy scale,double z,
double phi, Energy pt) {
ShoKinPtr showerKin = new_ptr(Decay_QTildeShowerKinematics1to2());
showerKin->scale(scale);
showerKin->z(z);
showerKin->phi(phi);
showerKin->pT(pt);
showerKin->SudakovFormFactor(this);
return showerKin;
}
diff --git a/src/defaults/Shower.in b/src/defaults/Shower.in
--- a/src/defaults/Shower.in
+++ b/src/defaults/Shower.in
@@ -1,268 +1,269 @@
############################################################
# Setup of default parton shower
#
# Useful switches for users are marked near the top of
# this file.
#
# Don't edit this file directly, but reset the switches
# in your own input files!
############################################################
library HwMPI.so
library HwShower.so
mkdir /Herwig/Shower
cd /Herwig/Shower
create Herwig::ShowerHandler ShowerHandler
newdef ShowerHandler:MPIHandler /Herwig/UnderlyingEvent/MPIHandler
newdef ShowerHandler:RemDecayer /Herwig/Partons/RemnantDecayer
#####################################
# initial setup, don't change these!
#####################################
create Herwig::SplittingGenerator SplittingGenerator
create Herwig::ShowerAlphaQCD AlphaQCD
create Herwig::ShowerAlphaQED AlphaQED
create Herwig::Evolver Evolver
create Herwig::QTildeModel ShowerModel
create Herwig::QTildeFinder PartnerFinder
create Herwig::QTildeReconstructor KinematicsReconstructor
newdef KinematicsReconstructor:ReconstructionOption Colour
newdef /Herwig/Partons/RemnantDecayer:AlphaS AlphaQCD
newdef /Herwig/Partons/RemnantDecayer:AlphaEM AlphaQED
newdef ShowerHandler:Evolver Evolver
newdef ShowerModel:PartnerFinder PartnerFinder
newdef ShowerModel:KinematicsReconstructor KinematicsReconstructor
newdef Evolver:ShowerModel ShowerModel
newdef Evolver:SplittingGenerator SplittingGenerator
newdef Evolver:HardScaleFactor 1.0
newdef Evolver:Interactions BothAtOnce
-newdef Evolver:SpinCorrelations Both
+newdef Evolver:SpinCorrelations Yes
+newdef Evolver:SoftCorrelations Singular
##################################################################
# Intrinsic pT
#
# Recommended:
# 1.9 GeV for Tevatron W/Z production.
# 2.1 GeV for LHC W/Z production at 10 TeV
# 2.2 GeV for LHC W/Z production at 14 TeV
#
# Set all parameters to 0 to disable
##################################################################
newdef Evolver:IntrinsicPtGaussian 1.9*GeV
newdef Evolver:IntrinsicPtBeta 0
newdef Evolver:IntrinsicPtGamma 0*GeV
newdef Evolver:IntrinsicPtIptmax 0*GeV
#############################################################
# Main control switches for the parton shower.
#############################################################
newdef SplittingGenerator:ISR Yes
newdef SplittingGenerator:FSR Yes
#############################################################
#############################################################
# End of interesting user servicable section.
#
# Anything that follows below should only be touched if you
# know what you're doing.
#
# Really.
#############################################################
#
# a few default values
newdef Evolver:MECorrMode 1
newdef AlphaQCD:ScaleFactor 1.0
newdef AlphaQCD:RenormalizationScaleFactor 1.0
newdef AlphaQCD:NPAlphaS 2
newdef AlphaQCD:Qmin 0.935
newdef AlphaQCD:NumberOfLoops 3
newdef AlphaQCD:InputOption 1
newdef AlphaQCD:AlphaMZ 0.120
#
#
# Lets set up all the splittings
create Herwig::HalfHalfOneSplitFn QtoQGammaSplitFn
set QtoQGammaSplitFn:InteractionType QED
set QtoQGammaSplitFn:ColourStructure ChargedChargedNeutral
set QtoQGammaSplitFn:AngularOrdered Yes
create Herwig::HalfHalfOneSplitFn QtoQGSplitFn
newdef QtoQGSplitFn:InteractionType QCD
newdef QtoQGSplitFn:ColourStructure TripletTripletOctet
set QtoQGSplitFn:AngularOrdered Yes
create Herwig::OneOneOneSplitFn GtoGGSplitFn
newdef GtoGGSplitFn:InteractionType QCD
newdef GtoGGSplitFn:ColourStructure OctetOctetOctet
set GtoGGSplitFn:AngularOrdered Yes
create Herwig::OneHalfHalfSplitFn GtoQQbarSplitFn
newdef GtoQQbarSplitFn:InteractionType QCD
newdef GtoQQbarSplitFn:ColourStructure OctetTripletTriplet
#set GtoQQbarSplitFn:AngularOrdered No
set GtoQQbarSplitFn:AngularOrdered Yes
create Herwig::OneHalfHalfSplitFn GammatoQQbarSplitFn
newdef GammatoQQbarSplitFn:InteractionType QED
newdef GammatoQQbarSplitFn:ColourStructure NeutralChargedCharged
#set GammatoQQbarSplitFn:AngularOrdered No
set GammatoQQbarSplitFn:AngularOrdered Yes
create Herwig::HalfOneHalfSplitFn QtoGQSplitFn
newdef QtoGQSplitFn:InteractionType QCD
newdef QtoGQSplitFn:ColourStructure TripletOctetTriplet
set QtoGQSplitFn:AngularOrdered Yes
create Herwig::HalfOneHalfSplitFn QtoGammaQSplitFn
newdef QtoGammaQSplitFn:InteractionType QED
newdef QtoGammaQSplitFn:ColourStructure ChargedNeutralCharged
set QtoGammaQSplitFn:AngularOrdered Yes
#
# Now the Sudakovs
create Herwig::QTildeSudakov SudakovCommon
newdef SudakovCommon:Alpha AlphaQCD
newdef SudakovCommon:cutoffKinScale 2.650*GeV
newdef SudakovCommon:PDFmax 1.0
cp SudakovCommon QtoQGSudakov
newdef QtoQGSudakov:SplittingFunction QtoQGSplitFn
newdef QtoQGSudakov:PDFmax 1.9
cp SudakovCommon QtoQGammaSudakov
set QtoQGammaSudakov:SplittingFunction QtoQGammaSplitFn
set QtoQGammaSudakov:Alpha AlphaQED
set QtoQGammaSudakov:PDFmax 1.9
cp QtoQGammaSudakov LtoLGammaSudakov
cp SudakovCommon GtoGGSudakov
newdef GtoGGSudakov:SplittingFunction GtoGGSplitFn
newdef GtoGGSudakov:PDFmax 2.0
cp SudakovCommon GtoQQbarSudakov
newdef GtoQQbarSudakov:SplittingFunction GtoQQbarSplitFn
newdef GtoQQbarSudakov:PDFmax 120.0
cp SudakovCommon GammatoQQbarSudakov
newdef GammatoQQbarSudakov:SplittingFunction GammatoQQbarSplitFn
newdef GammatoQQbarSudakov:PDFmax 120.0
cp SudakovCommon GtobbbarSudakov
newdef GtobbbarSudakov:SplittingFunction GtoQQbarSplitFn
newdef GtobbbarSudakov:PDFmax 40000.0
cp SudakovCommon GtoccbarSudakov
newdef GtoccbarSudakov:SplittingFunction GtoQQbarSplitFn
newdef GtoccbarSudakov:PDFmax 2000.0
cp SudakovCommon QtoGQSudakov
newdef QtoGQSudakov:SplittingFunction QtoGQSplitFn
cp SudakovCommon QtoGammaQSudakov
newdef QtoGammaQSudakov:SplittingFunction QtoGammaQSplitFn
cp SudakovCommon utoGuSudakov
newdef utoGuSudakov:SplittingFunction QtoGQSplitFn
newdef utoGuSudakov:PDFFactor OverOneMinusZ
newdef utoGuSudakov:PDFmax 5.0
cp SudakovCommon dtoGdSudakov
newdef dtoGdSudakov:SplittingFunction QtoGQSplitFn
newdef dtoGdSudakov:PDFFactor OverOneMinusZ
#
# Now add the final splittings
#
do SplittingGenerator:AddFinalSplitting u->u,g; QtoQGSudakov
do SplittingGenerator:AddFinalSplitting d->d,g; QtoQGSudakov
do SplittingGenerator:AddFinalSplitting s->s,g; QtoQGSudakov
do SplittingGenerator:AddFinalSplitting c->c,g; QtoQGSudakov
do SplittingGenerator:AddFinalSplitting b->b,g; QtoQGSudakov
do SplittingGenerator:AddFinalSplitting t->t,g; QtoQGSudakov
#
do SplittingGenerator:AddFinalSplitting g->g,g; GtoGGSudakov
#
do SplittingGenerator:AddFinalSplitting g->u,ubar; GtoQQbarSudakov
do SplittingGenerator:AddFinalSplitting g->d,dbar; GtoQQbarSudakov
do SplittingGenerator:AddFinalSplitting g->s,sbar; GtoQQbarSudakov
do SplittingGenerator:AddFinalSplitting g->c,cbar; GtoccbarSudakov
do SplittingGenerator:AddFinalSplitting g->b,bbar; GtobbbarSudakov
do SplittingGenerator:AddFinalSplitting g->t,tbar; GtoQQbarSudakov
#
do SplittingGenerator:AddFinalSplitting gamma->u,ubar; GammatoQQbarSudakov
do SplittingGenerator:AddFinalSplitting gamma->d,dbar; GammatoQQbarSudakov
do SplittingGenerator:AddFinalSplitting gamma->s,sbar; GammatoQQbarSudakov
do SplittingGenerator:AddFinalSplitting gamma->c,cbar; GammatoQQbarSudakov
do SplittingGenerator:AddFinalSplitting gamma->b,bbar; GammatoQQbarSudakov
do SplittingGenerator:AddFinalSplitting gamma->t,tbar; GammatoQQbarSudakov
do SplittingGenerator:AddFinalSplitting gamma->e-,e+; GammatoQQbarSudakov
do SplittingGenerator:AddFinalSplitting gamma->mu-,mu+; GammatoQQbarSudakov
do SplittingGenerator:AddFinalSplitting gamma->tau-,tau+; GammatoQQbarSudakov
#
do SplittingGenerator:AddFinalSplitting u->u,gamma; QtoQGammaSudakov
do SplittingGenerator:AddFinalSplitting d->d,gamma; QtoQGammaSudakov
do SplittingGenerator:AddFinalSplitting s->s,gamma; QtoQGammaSudakov
do SplittingGenerator:AddFinalSplitting c->c,gamma; QtoQGammaSudakov
do SplittingGenerator:AddFinalSplitting b->b,gamma; QtoQGammaSudakov
do SplittingGenerator:AddFinalSplitting t->t,gamma; QtoQGammaSudakov
do SplittingGenerator:AddFinalSplitting e-->e-,gamma; LtoLGammaSudakov
do SplittingGenerator:AddFinalSplitting mu-->mu-,gamma; LtoLGammaSudakov
do SplittingGenerator:AddFinalSplitting tau-->tau-,gamma; LtoLGammaSudakov
#
# Now lets add the initial splittings. Remember the form a->b,c; means
# that particle a is the particle given and we backward branch to
# particle b which is initial state and particle c which is final state
#
do SplittingGenerator:AddInitialSplitting u->u,g; QtoQGSudakov
do SplittingGenerator:AddInitialSplitting d->d,g; QtoQGSudakov
do SplittingGenerator:AddInitialSplitting s->s,g; QtoQGSudakov
do SplittingGenerator:AddInitialSplitting c->c,g; QtoQGSudakov
do SplittingGenerator:AddInitialSplitting b->b,g; QtoQGSudakov
do SplittingGenerator:AddInitialSplitting u->u,gamma; QtoQGammaSudakov
do SplittingGenerator:AddInitialSplitting d->d,gamma; QtoQGammaSudakov
do SplittingGenerator:AddInitialSplitting s->s,gamma; QtoQGammaSudakov
do SplittingGenerator:AddInitialSplitting c->c,gamma; QtoQGammaSudakov
do SplittingGenerator:AddInitialSplitting b->b,gamma; QtoQGammaSudakov
do SplittingGenerator:AddInitialSplitting t->t,gamma; QtoQGammaSudakov
do SplittingGenerator:AddInitialSplitting g->g,g; GtoGGSudakov
#
do SplittingGenerator:AddInitialSplitting g->d,dbar; GtoQQbarSudakov
do SplittingGenerator:AddInitialSplitting g->u,ubar; GtoQQbarSudakov
do SplittingGenerator:AddInitialSplitting g->s,sbar; GtoQQbarSudakov
do SplittingGenerator:AddInitialSplitting g->c,cbar; GtoccbarSudakov
do SplittingGenerator:AddInitialSplitting g->b,bbar; GtobbbarSudakov
#
do SplittingGenerator:AddInitialSplitting gamma->d,dbar; GammatoQQbarSudakov
do SplittingGenerator:AddInitialSplitting gamma->u,ubar; GammatoQQbarSudakov
do SplittingGenerator:AddInitialSplitting gamma->s,sbar; GammatoQQbarSudakov
do SplittingGenerator:AddInitialSplitting gamma->c,cbar; GammatoQQbarSudakov
do SplittingGenerator:AddInitialSplitting gamma->b,bbar; GammatoQQbarSudakov
#
do SplittingGenerator:AddInitialSplitting d->g,d; dtoGdSudakov
do SplittingGenerator:AddInitialSplitting u->g,u; utoGuSudakov
do SplittingGenerator:AddInitialSplitting s->g,s; QtoGQSudakov
do SplittingGenerator:AddInitialSplitting c->g,c; QtoGQSudakov
do SplittingGenerator:AddInitialSplitting b->g,b; QtoGQSudakov
do SplittingGenerator:AddInitialSplitting dbar->g,dbar; dtoGdSudakov
do SplittingGenerator:AddInitialSplitting ubar->g,ubar; utoGuSudakov
do SplittingGenerator:AddInitialSplitting sbar->g,sbar; QtoGQSudakov
do SplittingGenerator:AddInitialSplitting cbar->g,cbar; QtoGQSudakov
do SplittingGenerator:AddInitialSplitting bbar->g,bbar; QtoGQSudakov
#
do SplittingGenerator:AddInitialSplitting d->gamma,d; QtoGammaQSudakov
do SplittingGenerator:AddInitialSplitting u->gamma,u; QtoGammaQSudakov
do SplittingGenerator:AddInitialSplitting s->gamma,s; QtoGammaQSudakov
do SplittingGenerator:AddInitialSplitting c->gamma,c; QtoGammaQSudakov
do SplittingGenerator:AddInitialSplitting b->gamma,b; QtoGammaQSudakov
do SplittingGenerator:AddInitialSplitting dbar->gamma,dbar; QtoGammaQSudakov
do SplittingGenerator:AddInitialSplitting ubar->gamma,ubar; QtoGammaQSudakov
do SplittingGenerator:AddInitialSplitting sbar->gamma,sbar; QtoGammaQSudakov
do SplittingGenerator:AddInitialSplitting cbar->gamma,cbar; QtoGammaQSudakov
do SplittingGenerator:AddInitialSplitting bbar->gamma,bbar; QtoGammaQSudakov

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