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DecayPhaseSpaceChannel.icc
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DecayPhaseSpaceChannel.icc
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// -*- C++ -*-
//
// This is the implementation of the inlined member functions of
// the DecayPhaseSpaceChannel class.
//
// Author: Peter Richardson
//
namespace Herwig {
using namespace ThePEG;
// default constructor
inline DecayPhaseSpaceChannel::DecayPhaseSpaceChannel() {}
inline DecayPhaseSpaceChannel::DecayPhaseSpaceChannel(const DecayPhaseSpaceChannel & x)
: Interfaced(x) , _mode(x._mode),
_intpart(x._intpart), _jactype(x._jactype), _intmass(x._intmass),
_intwidth(x._intwidth), _intmass2(x._intmass2), _intmwidth(x._intmwidth),
_intpower(x._intpower), _intdau1(x._intdau1),
_intdau2(x._intdau2), _intext(x._intext)
{}
// clone method
inline IBPtr DecayPhaseSpaceChannel::clone() const {
return new_ptr(*this);
}
// full clone method
inline IBPtr DecayPhaseSpaceChannel::fullclone() const {
return new_ptr(*this);
}
// update method
inline void DecayPhaseSpaceChannel::doupdate() throw(UpdateException) {
Interfaced::doupdate();
// First update base class.
bool redo = touched();
// redo if touched.
// UpdateChecker::check(aDependentMember, redo);
// Update referenced objects on which this depends redo is set to true
// if the dependent object is touched.
// for_each(ContainerOfDependencies, UpdateChecker(redo));
// Update a container of references.
// for_each(MapOfDependencies, UpdateMapChecker(redo));
// Update a map of references.
if ( !redo ) return;
// return if nothing has been touched. Otherwise do the actual update.
// touch()
// Touch if anything has changed.
}
// do finish method
inline void DecayPhaseSpaceChannel::dofinish() {
Interfaced::dofinish();
}
// initrun method
inline void DecayPhaseSpaceChannel::doinitrun() {
Interfaced::doinitrun();
}
// rebonid method
inline void DecayPhaseSpaceChannel::rebind(const TranslationMap & trans)
throw(RebindException) {
//_mode = trans.translate(_mode);
Interfaced::rebind(trans);
}
// get references method
inline IVector DecayPhaseSpaceChannel::getReferences() {
IVector ret = Interfaced::getReferences();
// ret.push_back(dummy);
return ret;
}
// generate the mass of an intermediate
inline Energy DecayPhaseSpaceChannel::generateMass(int ires,Energy lower,Energy upper)
{
Energy mass=0;
if(lower>upper)
{throw DecayPhaseSpaceError() << "DecayPhaseSpaceChannel::generateMass not allowed";}
// use a Breit-Wigner
if(_jactype[ires]==0)
{
double rhomin = atan((lower*lower-_intmass2[ires])/_intmwidth[ires]);
double rhomax = atan((upper*upper-_intmass2[ires])/_intmwidth[ires])-rhomin;
double rho = rhomin+rhomax*CurrentGenerator::current().rnd();
mass = sqrt(_intmass2[ires]+_intmwidth[ires]*tan(rho));
}
// use a power-law
else if(_jactype[ires]==1)
{
double rhomin = pow(lower*lower,_intpower[ires]+1.);
double rhomax = pow(upper*upper,_intpower[ires]+1.)-rhomin;
double rho = rhomin+rhomax*CurrentGenerator::current().rnd();
mass = pow(rho,0.5/(_intpower[ires]+1.));
}
else if(_jactype[ires]==2)
{mass = _intmass[ires];}
else
{throw DecayPhaseSpaceError() << "Unknown type of Jacobian in "
<< "DecayPhaseSpaceChannel::generateMass";}
return mass;
}
// return the weight for a given resonance
inline InvEnergy2 DecayPhaseSpaceChannel::massWeight(int ires, Energy moff,
Energy lower,Energy upper)
{
double wgt=0.;
if(lower>upper)
{throw DecayPhaseSpaceError() << "DecayPhaseSpaceChannel::massWeight not allowed"
<< ires << " " << _intpart[ires]->id() << " "
<< moff;}
// use a Breit-Wigner
if(_jactype[ires]==0)
{
double rhomin = atan((lower*lower-_intmass2[ires])/_intmwidth[ires]);
double rhomax = atan((upper*upper-_intmass2[ires])/_intmwidth[ires])-rhomin;
Energy2 moff2=moff*moff-_intmass2[ires];
wgt = _intmwidth[ires]/rhomax/(moff2*moff2+_intmwidth[ires]*_intmwidth[ires]);
}
// power law
else if(_jactype[ires]==1)
{
double rhomin = pow(lower*lower,_intpower[ires]+1.);
double rhomax = pow(upper*upper,_intpower[ires]+1.)-rhomin;
wgt = (_intpower[ires]+1.)/rhomax*pow(moff*moff,_intpower[ires]);
}
else if(_jactype[ires]==2)
{
wgt = 1./pi/_intmwidth[ires];
}
else
{throw DecayPhaseSpaceError() << "Unknown type of Jacobian in "
<< "DecayPhaseSpaceChannel::massWeight";}
return wgt;
}
// add a new intermediate particle
inline void DecayPhaseSpaceChannel::addIntermediate(PDPtr part,int jac,double power,
int dau1,int dau2)
{
_intpart.push_back(part);
_jactype.push_back(jac);
_intpower.push_back(power);
_intdau1.push_back(dau1);
_intdau2.push_back(dau2);
}
// reset the mass and width of an intermediate particle
inline void DecayPhaseSpaceChannel::resetIntermediate(tcPDPtr part,Energy mass,
Energy width)
{
int idin=part->id();
for(unsigned int ix=0;ix<_intpart.size();++ix)
{if(_intpart[ix] && _intpart[ix]->id()==idin)
{_intmass[ix] =mass;_intwidth[ix]=width;
_intmass2[ix]=mass*mass;_intmwidth[ix]=mass*width;}}
}
inline void DecayPhaseSpaceChannel::resetDaughter(int oldp,int newp)
{
for(unsigned int ix=0;ix<_intdau1.size();++ix)
{if(_intdau1[ix]==oldp){_intdau1[ix]=newp;}}
for(unsigned int ix=0;ix<_intdau2.size();++ix)
{if(_intdau2[ix]==oldp){_intdau2[ix]=newp;}}
}
}

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