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diff --git a/Decay/DecayPhaseSpaceMode.cc b/Decay/DecayPhaseSpaceMode.cc
--- a/Decay/DecayPhaseSpaceMode.cc
+++ b/Decay/DecayPhaseSpaceMode.cc
@@ -1,514 +1,516 @@
// -*- C++ -*-
//
// DecayPhaseSpaceMode.cc is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2007 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 DecayPhaseSpaceMode class.
//
#include "DecayPhaseSpaceMode.h"
#include "Herwig++/PDT/GenericWidthGenerator.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Interface/Parameter.h"
#include "ThePEG/Interface/RefVector.h"
#include "DecayIntegrator.h"
#include "Herwig++/Utilities/Kinematics.h"
#include "ThePEG/EventRecord/HelicityVertex.h"
#include "Herwig++/Decay/DecayVertex.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "ThePEG/EventRecord/Event.h"
#include "ThePEG/Utilities/Debug.h"
using namespace Herwig;
using namespace ThePEG::Helicity;
void DecayPhaseSpaceMode::persistentOutput(PersistentOStream & os) const {
os << _integrator << _channels << _channelwgts << _maxweight << _niter
<< _npoint << _ntry << _extpart << _partial << _widthgen << _massgen
<< _testOnShell;
}
void DecayPhaseSpaceMode::persistentInput(PersistentIStream & is, int) {
is >> _integrator >> _channels >> _channelwgts >> _maxweight >> _niter
>> _npoint >> _ntry >> _extpart >> _partial >> _widthgen >> _massgen
>> _testOnShell;
}
ClassDescription<DecayPhaseSpaceMode> DecayPhaseSpaceMode::initDecayPhaseSpaceMode;
// Definition of the static class description member.
void DecayPhaseSpaceMode::Init() {
static ClassDocumentation<DecayPhaseSpaceMode> documentation
("The DecayPhaseSpaceMode class contains a number of phase space"
" channels for the integration of a particular decay mode");
static RefVector<DecayPhaseSpaceMode,DecayPhaseSpaceChannel> interfaceChannels
("Channels",
"The phase space integration channels.",
&DecayPhaseSpaceMode::_channels, 0, false, false, true, true);
}
// flat phase space generation and weight
Energy DecayPhaseSpaceMode::flatPhaseSpace(bool cc, const Particle & inpart,
ParticleVector & outpart) const {
double wgt(1.);
if(outpart.empty()) {
outpart.reserve(_extpart.size()-1);
for(unsigned int ix=1;ix<_extpart.size();++ix) {
if(cc&&_extpart[ix]->CC()) {
outpart.push_back((_extpart[ix]->CC())->produceParticle());
}
else {
outpart.push_back(_extpart[ix]->produceParticle());
}
}
}
// masses of the particles
Energy inmass(inpart.mass());
vector<Energy> mass = externalMasses(inmass,wgt);
// momenta of the particles
vector<Lorentz5Momentum> part(outpart.size());
// two body decay
assert(outpart.size()==2);
double ctheta,phi;
Kinematics::generateAngles(ctheta,phi);
if(! Kinematics::twoBodyDecay(inpart.momentum(), mass[1], mass[2],
ctheta, phi,part[0],part[1]))
throw Exception() << "Incoming mass - Outgoing mass negative in "
<< "DecayPhaseSpaceMode::flatPhaseSpace()"
<< Exception::eventerror;
wgt *= Kinematics::pstarTwoBodyDecay(inmass,mass[1],mass[2])/8./Constants::pi/inmass;
outpart[0]->set5Momentum(part[0]);
outpart[1]->set5Momentum(part[1]);
return wgt*inmass;
}
// initialise the phase space
Energy DecayPhaseSpaceMode::initializePhaseSpace(bool init) {
Energy output(ZERO);
// ensure that the weights add up to one
if(!_channels.empty()) {
double temp=0.;
for(unsigned int ix=0;ix<_channels.size();++ix) temp+=_channelwgts[ix];
for(unsigned int ix=0;ix<_channels.size();++ix) _channelwgts[ix]/=temp;
}
if(!init) return ZERO;
// create a particle vector from the particle data one
ThePEG::PPtr inpart=_extpart[0]->produceParticle();
ParticleVector particles;
// now if using flat phase space
_maxweight=0.;
double totsum(0.),totsq(0.);
InvEnergy pre=1./MeV;
Energy prewid;
if(_channels.empty()) {
double wsum=0.,wsqsum=0.;
Energy m0,mmin(ZERO);
for(unsigned int ix=1;ix<_extpart.size();++ix) {
mmin+=_extpart[ix]->massMin();
}
for(int ix=0;ix<_npoint;++ix) {
// set the mass of the decaying particle
m0 = (inpart->dataPtr())->generateMass();
double wgt=0.;
if(m0>mmin) {
inpart->set5Momentum(Lorentz5Momentum(m0));
// compute the prefactor
prewid = (_widthgen&&_partial>=0) ?
_widthgen->partialWidth(_partial,inpart->mass()) :
inpart->dataPtr()->width();
pre = prewid>ZERO ? 1./prewid : 1./MeV;
// generate the weight for this point
try {
int dummy;
wgt = pre*weight(false,dummy,*inpart,particles,true);
}
catch (Veto) {
wgt=0.;
}
}
if(wgt>_maxweight) _maxweight=wgt;
wsum=wsum+wgt;
wsqsum=wsqsum+wgt*wgt;
}
wsum=wsum/_npoint;
wsqsum=wsqsum/_npoint-sqr(wsum);
if(wsqsum<0.) wsqsum=0.;
wsqsum=sqrt(wsqsum/_npoint);
Energy fact = (_widthgen&&_partial>=0) ?
_widthgen->partialWidth(_partial,inpart->nominalMass()) :
inpart->dataPtr()->width();
if(fact==ZERO) fact=MeV;
// factor for the weight with spin correlations
_maxweight *= inpart->dataPtr()->iSpin()==1 ? 1.1 : 1.6;
if ( Debug::level > 1 ) {
// ouptut the information on the initialisation
CurrentGenerator::log() << "Initialized the phase space for the decay "
<< _extpart[0]->PDGName() << " -> ";
for(unsigned int ix=1,N=_extpart.size();ix<N;++ix)
CurrentGenerator::log() << _extpart[ix]->PDGName() << " ";
CurrentGenerator::log() << "\n";
if(fact!=MeV) CurrentGenerator::log() << "The branching ratio is " << wsum
<< " +/- " << wsqsum << "\n";
CurrentGenerator::log() << "The partial width is " << wsum*fact/MeV
<< " +/- " << wsqsum*fact/MeV << " MeV\n";
CurrentGenerator::log() << "The partial width is "
<< wsum*fact/6.58212E-22/MeV
<< " +/- " << wsqsum*fact/6.58212E-22/MeV<< " s-1\n";
CurrentGenerator::log() << "The maximum weight is "
<< _maxweight << endl;
}
output=wsum*fact;
}
else {
for(int iy=0;iy<_niter;++iy) {
// zero the maximum weight
_maxweight=0.;
vector<double> wsum(_channels.size(),0.),wsqsum(_channels.size(),0.);
vector<int> nchan(_channels.size(),0);
totsum = 0.; totsq = 0.;
Energy m0,mmin(ZERO);
for(unsigned int ix=1;ix<_extpart.size();++ix) {
mmin+=_extpart[ix]->massMin();
}
for(int ix=0;ix<_npoint;++ix) {
m0 = (inpart->dataPtr())->generateMass();
double wgt=0.;
int ichan;
if(m0>mmin) {
inpart->set5Momentum(Lorentz5Momentum(m0));
// compute the prefactor
prewid= (_widthgen&&_partial>=0) ?
_widthgen->partialWidth(_partial,inpart->mass()) :
inpart->dataPtr()->width();
pre = prewid>ZERO ? 1./prewid : 1./MeV;
// generate the weight for this point
try {
wgt = pre*weight(false,ichan,*inpart,particles,true);
}
catch (Veto) {
wgt=0.;
}
}
if(wgt>_maxweight) _maxweight=wgt;
wsum[ichan]=wsum[ichan]+wgt;
totsum+=wgt;
wsqsum[ichan]=wsqsum[ichan]+sqr(wgt);
totsq+=wgt*wgt;
++nchan[ichan];
}
totsum=totsum/_npoint;
totsq=totsq/_npoint-sqr(totsum);
if(totsq<0.) totsq=0.;
totsq=sqrt(totsq/_npoint);
if ( Debug::level > 1 )
CurrentGenerator::log() << "The branching ratio is " << iy << " "
<< totsum << " +/- " << totsq
<< _maxweight << "\n";
// compute the individual terms
double total(0.);
for(unsigned int ix=0;ix<_channels.size();++ix) {
if(nchan[ix]!=0) {
wsum[ix]=wsum[ix]/nchan[ix];
wsqsum[ix]=wsqsum[ix]/nchan[ix];
if(wsqsum[ix]<0.) wsqsum[ix]=0.;
wsqsum[ix]=sqrt(wsqsum[ix]/nchan[ix]);
}
else {
wsum[ix]=0;
wsqsum[ix]=0;
}
total+=sqrt(wsqsum[ix])*_channelwgts[ix];
}
- double temp;
- for(unsigned int ix=0;ix<_channels.size();++ix) {
- temp=sqrt(wsqsum[ix])*_channelwgts[ix]/total;
- _channelwgts[ix]=temp;
+ if(total>0.) {
+ double temp;
+ for(unsigned int ix=0;ix<_channels.size();++ix) {
+ temp=sqrt(wsqsum[ix])*_channelwgts[ix]/total;
+ _channelwgts[ix]=temp;
+ }
}
}
// factor for the weight with spin correlations
_maxweight*= inpart->dataPtr()->iSpin()==1 ? 1.1 : 1.6;
// ouptut the information on the initialisation
Energy fact = (_widthgen&&_partial>=0) ?
_widthgen->partialWidth(_partial,inpart->nominalMass()) :
inpart->dataPtr()->width();
if(fact==ZERO) fact=MeV;
if ( Debug::level > 1 ) {
CurrentGenerator::log() << "Initialized the phase space for the decay "
<< _extpart[0]->PDGName() << " -> ";
for(unsigned int ix=1,N=_extpart.size();ix<N;++ix)
CurrentGenerator::log() << _extpart[ix]->PDGName() << " ";
CurrentGenerator::log() << "\n";
if(fact!=MeV) CurrentGenerator::log() << "The branching ratio is " << totsum
<< " +/- " << totsq << "\n";
CurrentGenerator::log() << "The partial width is " << totsum*fact/MeV
<< " +/- " << totsq*fact/MeV << " MeV\n";
CurrentGenerator::log() << "The partial width is "
<< totsum*fact/6.58212E-22/MeV
<< " +/- " << totsq*fact/6.58212E-22/MeV
<< " s-1\n";
CurrentGenerator::log() << "The maximum weight is "
<< _maxweight << "\n";
CurrentGenerator::log() << "The weights for the different phase"
<< " space channels are \n";
for(unsigned int ix=0,N=_channels.size();ix<N;++ix) {
CurrentGenerator::log() << "Channel " << ix
<< " had weight " << _channelwgts[ix]
<< "\n";
}
CurrentGenerator::log() << flush;
}
output=totsum*fact;
}
return output;
}
// generate a phase-space point using multichannel phase space
Energy DecayPhaseSpaceMode::channelPhaseSpace(bool cc,
int & ichan, const Particle & inpart,
ParticleVector & outpart) const {
// select the channel
vector<Lorentz5Momentum> momenta;
double wgt(UseRandom::rnd());
// select a channel
ichan=-1;
do{++ichan;wgt-=_channelwgts[ichan];}
while(ichan<int(_channels.size())&&wgt>0.);
// generate the momenta
if(ichan==int(_channels.size())) {
throw DecayIntegratorError() << "DecayPhaseSpaceMode::channelPhaseSpace()"
<< " failed to select a channel"
<< Exception::abortnow;
}
// generate the masses of the external particles
double masswgt(1.);
vector<Energy> mass(externalMasses(inpart.mass(),masswgt));
momenta=_channels[ichan]->generateMomenta(inpart.momentum(),mass);
// compute the denominator of the weight
wgt=0.;
unsigned int ix;
for(ix=0;ix<_channels.size();++ix) {
wgt+=_channelwgts[ix]*_channels[ix]->generateWeight(momenta);
}
// now we need to set the momenta of the particles
// create the particles if they don't exist
if(outpart.empty()) {
for(ix=1;ix<_extpart.size();++ix) {
if(cc&&_extpart[ix]->CC()) {
outpart.push_back((_extpart[ix]->CC())->produceParticle());
}
else {
outpart.push_back(_extpart[ix]->produceParticle());
}
}
}
// set up the momenta
for(ix=0;ix<outpart.size();++ix) outpart[ix]->set5Momentum(momenta[ix+1]);
// return the weight
return inpart.mass()*masswgt/wgt;
}
// generate the decay
ParticleVector DecayPhaseSpaceMode::generate(bool intermediates,bool cc,
const Particle & inpart) const {
// compute the prefactor
InvEnergy pre(1./MeV);
Energy prewid;
if(_widthgen&&_partial>=0) prewid=_widthgen->partialWidth(_partial,inpart.mass());
else prewid=(inpart.dataPtr()->width());
pre = prewid>ZERO ? 1./prewid : 1./MeV;
// Particle vector for the output
ParticleVector particles;
// construct a new particle which is at rest
Particle inrest(inpart);
inrest.boost(-inpart.momentum().boostVector());
int ncount(0),ichan; double wgt(0.);
unsigned int ix;
try {
do {
wgt=pre*weight(cc,ichan,inrest,particles,ncount==0);
++ncount;
if(wgt>_maxweight) {
CurrentGenerator::log() << "Resetting max weight for decay "
<< inrest.PDGName() << " -> ";
for(ix=0;ix<particles.size();++ix)
CurrentGenerator::log() << " " << particles[ix]->PDGName();
CurrentGenerator::log() << " " << _maxweight << " " << wgt
<< " " << inrest.mass()/MeV << "\n";
_maxweight=wgt;
}
}
while(_maxweight*UseRandom::rnd()>wgt&&ncount<_ntry);
if(ncount>=_ntry) {
CurrentGenerator::log() << "The decay " << inrest.PDGName() << " -> ";
for(ix=0;ix<particles.size();++ix)
CurrentGenerator::log() << " " << particles[ix]->PDGName();
CurrentGenerator::log() << " " << _maxweight << " " << _ntry
<< " is too inefficient for the particle "
<< inpart << "vetoing the decay \n";
particles.clear();
throw Veto();
}
}
catch (Veto) {
// restore the incoming particle to its original state
Boost boostv(inpart.momentum().boostVector());
inrest.boost(boostv);
throw Veto();
}
// set up the vertex for spin correlations
me2(-1,inrest,particles,DecayIntegrator::Terminate);
const_ptr_cast<tPPtr>(&inpart)->spinInfo(inrest.spinInfo());
constructVertex(inpart,particles);
// return if intermediate particles not required
Boost boostv(inpart.momentum().boostVector());
if(_channelwgts.empty()||!intermediates) {
for(ix=0;ix<particles.size();++ix) particles[ix]->boost(boostv);
}
// find the intermediate particles
else {
// select the channel
_ichannel = selectChannel(inpart,particles);
for(ix=0;ix<particles.size();++ix) particles[ix]->boost(boostv);
// generate the particle vector
_channels[_ichannel]->generateIntermediates(cc,inpart,particles);
}
return particles;
}
// construct the vertex for spin corrections
void DecayPhaseSpaceMode::constructVertex(const Particle & inpart,
const ParticleVector & decay) const {
// construct the decay vertex
VertexPtr vertex(new_ptr(DecayVertex()));
DVertexPtr Dvertex(dynamic_ptr_cast<DVertexPtr>(vertex));
// set the incoming particle for the decay vertex
(inpart.spinInfo())->decayVertex(vertex);
for(unsigned int ix=0;ix<decay.size();++ix) {
(decay[ix]->spinInfo())->productionVertex(vertex);
}
// set the matrix element
Dvertex->ME().reset(_integrator->ME());
}
// output info on the mode
ostream & Herwig::operator<<(ostream & os, const DecayPhaseSpaceMode & decay) {
os << "The mode has " << decay._channels.size() << " channels\n";
os << "This is a mode for the decay of " << decay._extpart[0]->PDGName()
<< " to ";
for(unsigned int iz=1,N=decay._extpart.size();iz<N;++iz) {
os << decay._extpart[iz]->PDGName() << " ";
}
os << "\n";
for(unsigned int ix=0;ix<decay._channels.size();++ix) {
os << "Information on channel " << ix << "\n";
os << *(decay._channels[ix]);
}
return os;
}
void DecayPhaseSpaceMode::doinit() {
// check the size of the weight vector is the same as the number of channels
if(_channelwgts.size()!=numberChannels()) {
throw Exception() << "Inconsistent number of channel weights and channels"
<< " in DecayPhaseSpaceMode " << Exception::abortnow;
}
Interfaced::doinit();
_massgen.resize(_extpart.size());
if(_extpart[0]->widthGenerator()) {
_widthgen=
dynamic_ptr_cast<cGenericWidthGeneratorPtr>(_extpart[0]->widthGenerator());
//const_ptr_cast<GenericWidthGeneratorPtr>(_widthgen)->init();
}
else {
_widthgen=cGenericWidthGeneratorPtr();
}
tcGenericWidthGeneratorPtr wtemp;
for(unsigned int ix=0;ix<_extpart.size();++ix) {
assert(_extpart[ix]);
_massgen[ix]= dynamic_ptr_cast<cGenericMassGeneratorPtr>(_extpart[ix]->massGenerator());
if(ix>0) {
wtemp=
dynamic_ptr_cast<tcGenericWidthGeneratorPtr>(_extpart[ix]->widthGenerator());
//if(wtemp) const_ptr_cast<tGenericWidthGeneratorPtr>(wtemp)->init();
}
}
for(unsigned int ix=0;ix<_channels.size();++ix) {
_channels[ix]->init();
}
}
void DecayPhaseSpaceMode::doinitrun() {
// check the size of the weight vector is the same as the number of channels
if(_channelwgts.size()!=numberChannels()) {
throw Exception() << "Inconsistent number of channel weights and channels"
<< " in DecayPhaseSpaceMode " << Exception::abortnow;
}
for(unsigned int ix=0;ix<_channels.size();++ix) {
_channels[ix]->initrun();
}
if(_widthgen) const_ptr_cast<GenericWidthGeneratorPtr>(_widthgen)->initrun();
tcGenericWidthGeneratorPtr wtemp;
for(unsigned int ix=1;ix<_extpart.size();++ix) {
wtemp=
dynamic_ptr_cast<tcGenericWidthGeneratorPtr>(_extpart[ix]->widthGenerator());
if(wtemp) const_ptr_cast<tGenericWidthGeneratorPtr>(wtemp)->initrun();
}
Interfaced::doinitrun();
}
// generate the masses of the external particles
vector<Energy> DecayPhaseSpaceMode::externalMasses(Energy inmass,double & wgt) const {
vector<Energy> mass(1,inmass);
mass.reserve(_extpart.size());
vector<int> notdone;
Energy mlow(ZERO);
// set masses of stable particles and limits
for(unsigned int ix=1;ix<_extpart.size();++ix) {
// get the mass of the particle if can't use weight
if(!_massgen[ix] || _extpart[ix]->stable()) {
mass.push_back(_extpart[ix]->generateMass());
mlow+=mass[ix];
}
else {
mass.push_back(ZERO);
notdone.push_back(ix);
mlow+=_extpart[ix]->mass()-_extpart[ix]->widthLoCut();
}
}
if(mlow>inmass) {
CurrentGenerator::log() << "Decay mode " << _extpart[0]->PDGName() << " -> ";
for(unsigned int ix=1;ix<_extpart.size();++ix) {
CurrentGenerator::log() << _extpart[ix]->PDGName() << " ";
}
CurrentGenerator::log() << "is below threshold in DecayPhaseMode::externalMasses()"
<< "the threshold is " << mlow/GeV
<< "GeV and the parent mass is " << inmass/GeV
<< " GeV\n";
throw Veto();
}
// now we need to generate the masses for the particles we haven't
unsigned int iloc;
double wgttemp;
Energy low=ZERO;
for( ;!notdone.empty();) {
iloc=long(UseRandom::rnd()*(notdone.size()-1));
low=_extpart[notdone[iloc]]->mass()-_extpart[notdone[iloc]]->widthLoCut();
mlow-=low;
mass[notdone[iloc]]=
_massgen[notdone[iloc]]->mass(wgttemp,*_extpart[notdone[iloc]],low,inmass-mlow);
wgt*=wgttemp;
mlow+=mass[notdone[iloc]];
notdone.erase(notdone.begin()+iloc);
}
return mass;
}
diff --git a/Models/General/NBodyDecayConstructorBase.cc b/Models/General/NBodyDecayConstructorBase.cc
--- a/Models/General/NBodyDecayConstructorBase.cc
+++ b/Models/General/NBodyDecayConstructorBase.cc
@@ -1,162 +1,162 @@
// -*- C++ -*-
//
// NBodyDecayConstructorBase.cc is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2007 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 NBodyDecayConstructorBase class.
//
#include "NBodyDecayConstructorBase.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/PDT/DecayMode.h"
#include "ThePEG/Interface/Parameter.h"
#include "ThePEG/Interface/Switch.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "DecayConstructor.h"
using namespace Herwig;
using namespace ThePEG;
void NBodyDecayConstructorBase::persistentOutput(PersistentOStream & os ) const {
os << _init << _iteration << _points << _info << _decayConstructor;
}
void NBodyDecayConstructorBase::persistentInput(PersistentIStream & is , int) {
is >> _init >> _iteration >> _points >> _info >> _decayConstructor;
}
AbstractClassDescription<NBodyDecayConstructorBase>
NBodyDecayConstructorBase::initNBodyDecayConstructorBase;
// Definition of the static class description member.
void NBodyDecayConstructorBase::Init() {
static ClassDocumentation<NBodyDecayConstructorBase> documentation
("The NBodyDecayConstructorBase class is the base class for the automatic"
"construction of the decay modes");
static Switch<NBodyDecayConstructorBase,bool> interfaceInitializeDecayers
("InitializeDecayers",
"Initialize new decayers",
&NBodyDecayConstructorBase::_init, true, false, false);
static SwitchOption interfaceInitializeDecayersInitializeDecayersOn
(interfaceInitializeDecayers,
"Yes",
"Initialize new decayers to find max weights",
true);
static SwitchOption interfaceInitializeDecayersoff
(interfaceInitializeDecayers,
"No",
"Use supplied weights for integration",
false);
static Parameter<NBodyDecayConstructorBase,int> interfaceInitIteration
("InitIteration",
"Number of iterations to optimise integration weights",
&NBodyDecayConstructorBase::_iteration, 1, 0, 10,
false, false, true);
static Parameter<NBodyDecayConstructorBase,int> interfaceInitPoints
("InitPoints",
"Number of points to generate when optimising integration",
&NBodyDecayConstructorBase::_points, 1000, 100, 100000000,
false, false, true);
static Switch<NBodyDecayConstructorBase,bool> interfaceOutputInfo
("OutputInfo",
"Whether to output information about the decayers",
&NBodyDecayConstructorBase::_info, false, false, false);
static SwitchOption interfaceOutputInfoOff
(interfaceOutputInfo,
"No",
"Do not output information regarding the created decayers",
false);
static SwitchOption interfaceOutputInfoOn
(interfaceOutputInfo,
"Yes",
"Output information regarding the decayers",
true);
static Switch<NBodyDecayConstructorBase,bool> interfaceCreateDecayModes
("CreateDecayModes",
"Whether to create the ThePEG::DecayMode objects as well as the decayers",
&NBodyDecayConstructorBase::_createmodes, true, false, false);
static SwitchOption interfaceCreateDecayModesOn
(interfaceCreateDecayModes,
"Yes",
"Create the ThePEG::DecayMode objects",
true);
static SwitchOption interfaceCreateDecayModesOff
(interfaceCreateDecayModes,
"No",
"Only create the Decayer objects",
false);
}
void NBodyDecayConstructorBase::setBranchingRatio(tDMPtr dm, Energy pwidth) {
//Need width and branching ratios for all currently created decay modes
PDPtr parent = const_ptr_cast<PDPtr>(dm->parent());
DecaySet modes = parent->decayModes();
if( modes.empty() ) return;
double dmbrat(0.);
if( modes.size() == 1 ) {
parent->width(pwidth);
if( pwidth > ZERO ) parent->cTau(hbarc/pwidth);
dmbrat = 1.;
}
else {
Energy currentwidth(parent->width());
Energy newWidth(currentwidth + pwidth);
parent->width(newWidth);
if( newWidth > ZERO ) parent->cTau(hbarc/newWidth);
//need to reweight current branching fractions if there are any
- double factor(currentwidth/newWidth);
+ double factor = newWidth > ZERO ? double(currentwidth/newWidth) : 0.;
for(DecaySet::const_iterator dit = modes.begin();
dit != modes.end(); ++dit) {
if( **dit == *dm || !(**dit).on() ) continue;
double newbrat = ((**dit).brat())*factor;
ostringstream brf;
brf << setprecision(13)<< newbrat;
generator()->preinitInterface(*dit, "BranchingRatio",
"set", brf.str());
}
//set brat for current mode
- dmbrat = pwidth/newWidth;
+ dmbrat = newWidth > ZERO ? double(pwidth/newWidth) : 0.;
}
ostringstream br;
br << setprecision(13) << dmbrat;
generator()->preinitInterface(dm, "BranchingRatio",
"set", br.str());
}
void NBodyDecayConstructorBase::setDecayerInterfaces(string fullname) const {
if( initialize() ) {
ostringstream value;
value << initialize();
generator()->preinitInterface(fullname, "Initialize", "set",
value.str());
value.str("");
value << iteration();
generator()->preinitInterface(fullname, "Iteration", "set",
value.str());
value.str("");
value << points();
generator()->preinitInterface(fullname, "Points", "set",
value.str());
}
// QED stuff if needed
if(decayConstructor()->QEDGenerator())
generator()->preinitInterface(fullname, "PhotonGenerator", "set",
decayConstructor()->QEDGenerator()->fullName());
string outputmodes;
if( info() ) outputmodes = string("Output");
else outputmodes = string("NoOutput");
generator()->preinitInterface(fullname, "OutputModes", "set",
outputmodes);
}

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