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BranchingRatioReweighter.cc
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BranchingRatioReweighter.cc
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// -*- C++ -*-
//
// This is the implementation of the non-inlined, non-templated member
// functions of the BranchingRatioReweighter class.
//
#include "BranchingRatioReweighter.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/EventRecord/Particle.h"
#include "ThePEG/EventRecord/Event.h"
#include "ThePEG/Handlers/EventHandler.h"
#include "ThePEG/Repository/UseRandom.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "ThePEG/EventRecord/StandardSelectors.h"
#include "ThePEG/Handlers/StandardEventHandler.h"
#include "Herwig/Utilities/EnumParticles.h"
using namespace Herwig;
BranchingRatioReweighter::BranchingRatioReweighter() {}
BranchingRatioReweighter::~BranchingRatioReweighter() {}
void BranchingRatioReweighter::
handle(EventHandler & eh,const tPVector & ,const Hint & ) {
tEventPtr event = eh.currentEvent();
// weight
double weight = 1.;
// get all the particles
set<tcPPtr> particles;
event->select(inserter(particles),ThePEG::AllSelector());
for(set<tcPPtr>::const_iterator it=particles.begin();it!=particles.end();++it) {
// skip stable
if((**it).dataPtr()->stable()) continue;
// skip remnant and clusters
if((**it).id()==ParticleID::Remnant ||
(**it).id()==ParticleID::Cluster) continue;
// if spacelike skip
if((**it).mass()<ZERO) continue;
if(*it == event->incoming().first ||
*it == event->incoming().second ) continue;
// find unique particles
bool unique = true;
for(unsigned int ix=0;ix<(**it).children().size();++ix) {
if((**it).children()[ix]->id()==(**it).id()) {
unique = false;
break;
}
}
if(!unique) continue;
weight *= (**it).dataPtr()->decaySelector().sum();
}
// do the reweighting
if ( dynamic_cast<StandardEventHandler*>(&eh) ) {
StandardEventHandler& seh =
dynamic_cast<StandardEventHandler&>(eh);
seh.reweight(weight);
}
}
IBPtr BranchingRatioReweighter::clone() const {
return new_ptr(*this);
}
IBPtr BranchingRatioReweighter::fullclone() const {
return new_ptr(*this);
}
// The following static variable is needed for the type description system in ThePEG.
DescribeNoPIOClass<BranchingRatioReweighter,StepHandler>
describeHerwigBranchingRatioReweighter("Herwig::BranchingRatioReweighter", "Herwig.so");
void BranchingRatioReweighter::Init() {
static ClassDocumentation<BranchingRatioReweighter> documentation
("The BranchingRatioReweighter class reweights events if some"
" decay modes are switched off");
}

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