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GenericMassGenerator.cc
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GenericMassGenerator.cc
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// -*- C++ -*-
//
// GenericMassGenerator.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 GenericMassGenerator class.
//
#include "GenericMassGenerator.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Interface/Parameter.h"
#include "ThePEG/Interface/Switch.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "ThePEG/Utilities/Throw.h"
#include "ThePEG/Utilities/Rebinder.h"
using namespace Herwig;
using namespace ThePEG;
void GenericMassGenerator::persistentOutput(PersistentOStream & os) const {
os << particle_
<< ounit(lowerMass_,GeV) << ounit(upperMass_,GeV) << maxWgt_
<< BWShape_ << nGenerate_
<< ounit(mass_,GeV) << ounit(width_,GeV)
<< ounit(mass2_,GeV2) << ounit(mWidth_,GeV2)
<< nInitial_ << initialize_ << output_ << widthGen_ << widthOpt_;
}
void GenericMassGenerator::persistentInput(PersistentIStream & is, int) {
is >> particle_
>> iunit(lowerMass_,GeV) >> iunit(upperMass_,GeV) >> maxWgt_
>> BWShape_ >> nGenerate_
>> iunit(mass_,GeV) >> iunit(width_ ,GeV)
>> iunit(mass2_,GeV2) >> iunit(mWidth_ ,GeV2)
>> nInitial_ >> initialize_ >> output_ >> widthGen_ >> widthOpt_;
}
ClassDescription<GenericMassGenerator> GenericMassGenerator::initGenericMassGenerator;
// Definition of the static class description member.
void GenericMassGenerator::Init() {
static ClassDocumentation<GenericMassGenerator> documentation
("The GenericMassGenerator class is the main class for"
" mass generation in Herwig++.");
static Parameter<GenericMassGenerator,string> interfaceParticle
("Particle",
"The particle data object for this class",
0, "", true, false,
&GenericMassGenerator::setParticle,
&GenericMassGenerator::getParticle);
static Switch<GenericMassGenerator,bool> interfaceInitialize
("Initialize",
"Initialize the calculation of the maximum weight etc",
&GenericMassGenerator::initialize_, false, false, false);
static SwitchOption interfaceInitializeInitialization
(interfaceInitialize,
"Yes",
"Do the initialization",
true);
static SwitchOption interfaceInitializeNoInitialization
(interfaceInitialize,
"No",
"Don't do the initalization",
false);
static Switch<GenericMassGenerator,bool> interfaceOutput
("Output",
"Output the setup",
&GenericMassGenerator::output_, false, false, false);
static SwitchOption interfaceOutputYes
(interfaceOutput,
"Yes",
"Output the data",
true);
static SwitchOption interfaceOutputNo
(interfaceOutput,
"No",
"Don't output the data",
false);
static Switch<GenericMassGenerator,int> interfaceBreitWignerShape
("BreitWignerShape",
"Controls the shape of the mass distribution generated",
&GenericMassGenerator::BWShape_, 0, false, false);
static SwitchOption interfaceBreitWignerShapeDefault
(interfaceBreitWignerShape,
"Default",
"Running width with q in numerator and denominator width factor",
0);
static SwitchOption interfaceBreitWignerShapeFixedWidth
(interfaceBreitWignerShape,
"FixedWidth",
"Use a fixed width",
1);
static SwitchOption interfaceBreitWignerShapeNoq
(interfaceBreitWignerShape,
"Noq",
"Use M rather than q in the numerator and denominator width factor",
2);
static SwitchOption interfaceBreitWignerShapeNoNumerator
(interfaceBreitWignerShape,
"NoNumerator",
"Neglect the numerator factors",
3);
static Parameter<GenericMassGenerator,double> interfaceMaximumWeight
("MaximumWeight",
"The maximum weight for the unweighting",
&GenericMassGenerator::maxWgt_, 1.0, 0.0, 1000.0,
false, false, true);
static Parameter<GenericMassGenerator,int> interfaceNGenerate
("NGenerate",
"The number of tries to generate the mass",
&GenericMassGenerator::nGenerate_, 100, 0, 10000,
false, false, true);
static Parameter<GenericMassGenerator,int> interfaceNInitial
("NInitial",
"Number of tries for the initialisation",
&GenericMassGenerator::nInitial_, 1000, 0, 100000,
false, false, true);
static Switch<GenericMassGenerator,bool> interfaceWidthOption
("WidthOption",
"Which width to use",
&GenericMassGenerator::widthOpt_, false, false, false);
static SwitchOption interfaceWidthOptionNominalWidth
(interfaceWidthOption,
"NominalWidth",
"Use the normal width from the particle data object",
false);
static SwitchOption interfaceWidthOptionPhysicalWidth
(interfaceWidthOption,
"PhysicalWidth",
"Use the width calculated at the on-shell mass",
true);
}
bool GenericMassGenerator::accept(const ParticleData & in) const {
if(!particle_) return false;
return in.id() == particle_->id() ||
( particle_->CC() && particle_->CC()->id() == in.id() );
}
void GenericMassGenerator::doinit() {
MassGenerator::doinit();
if(particle_->massGenerator()!=this) return;
// the width generator
particle_->init();
widthGen_=particle_->widthGenerator();
if(widthGen_){widthGen_->init();}
// local storage of particle properties for speed
mass_=particle_->mass();
width_= widthOpt_ ? particle_->generateWidth(mass_) : particle_->width();
mass2_=mass_*mass_;
mWidth_=mass_*width_;
lowerMass_ = mass_-particle_->widthLoCut();
upperMass_ = mass_+particle_->widthUpCut();
// print out messagw if doing the initialisation
if(initialize_) {
// zero the maximum weight
maxWgt_=0.;
// storage of variable for the loop
double wgt=0.;
// perform the initialisation
// (mass() contains a ThePEG::Random call)
for(int ix=0; ix<nInitial_; ++ix) {
mass(wgt, *particle_, 3);
if ( wgt > maxWgt_ )
maxWgt_ = wgt;
}
}
}
void GenericMassGenerator::dataBaseOutput(ofstream & output, bool header) {
if(header) output << "update Mass_Generators set parameters=\"";
output << "newdef " << fullName() << ":BreitWignerShape " << BWShape_ << "\n";
output << "newdef " << fullName() << ":MaximumWeight " << maxWgt_ << "\n";
output << "newdef " << fullName() << ":NGenerate " << nGenerate_ << "\n";
output << "newdef " << fullName() << ":WidthOption " << widthOpt_ << "\n";
if(header) output << "\n\" where BINARY ThePEGFullName=\""
<< fullName() << "\";" << endl;
}
void GenericMassGenerator::dofinish() {
if(output_) {
string fname = CurrentGenerator::current().filename() +
string("-") + name() + string(".output");
ofstream output(fname.c_str());
dataBaseOutput(output,true);
}
MassGenerator::dofinish();
}
void GenericMassGenerator::setParticle(string p) {
if ( (particle_ = Repository::GetPtr<tPDPtr>(p)) ) return;
particle_ = Repository::findParticle(StringUtils::basename(p));
if ( ! particle_ )
Throw<InterfaceException>()
<< "Could not set Particle interface "
<< "for the object \"" << name()
<< "\". Particle \"" << StringUtils::basename(p) << "\" not found."
<< Exception::runerror;
}
string GenericMassGenerator::getParticle() const {
return particle_ ? particle_->fullName() : "";
}
void GenericMassGenerator::rebind(const TranslationMap & trans)
{
particle_ = trans.translate(particle_);
MassGenerator::rebind(trans);
}
IVector GenericMassGenerator::getReferences() {
IVector ret = MassGenerator::getReferences();
ret.push_back(particle_);
return ret;
}

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