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DecayVertex.cc
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DecayVertex.cc
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// -*- C++ -*-
//
// DecayVertex.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 DecayVertex class.
//
// Author: Peter Richardson
//
#include "DecayVertex.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Helicity/SpinInfo.h"
#ifdef ThePEG_TEMPLATES_IN_CC_FILE
// #include "DecayVertex.tcc"
#endif
namespace Herwig {
using ThePEG::Helicity::SpinInfo;
using ThePEG::Helicity::tcSpinfoPtr;
using namespace ThePEG;
NoPIOClassDescription<DecayVertex> DecayVertex::initDecayVertex;
// Definition of the static class description member.
void DecayVertex::Init() {
static ClassDocumentation<DecayVertex> documentation
("The DecayVertex class is the implementation of a "
"vertex for a decay for the Herwig++ spin correlation algorithm");
}
// method to get the rho matrix for a given outgoing particle
RhoDMatrix DecayVertex::getRhoMatrix(int i)
{
// get the rho matrices for the outgoing particles
vector<RhoDMatrix> rhoout;
for(unsigned int ix=0,N=outgoing().size();ix<N;++ix)
{
if(int(ix)!=i)
{rhoout.push_back(dynamic_ptr_cast<tcSpinfoPtr>(outgoing()[ix])->DMatrix());}
}
// calculate the spin density matrix
RhoDMatrix input=dynamic_ptr_cast<tcSpinfoPtr>(incoming()[0])->rhoMatrix();
RhoDMatrix temp=_matrixelement.calculateRhoMatrix(i,input,rhoout);
return temp;
}
// method to get the D matrix for an incoming particle
RhoDMatrix DecayVertex::getDMatrix(int)
{
// get the decay matrices for the outgoing particles
vector<RhoDMatrix> Dout;
for(unsigned int ix=0,N=outgoing().size();ix<N;++ix)
{
Dout.push_back(dynamic_ptr_cast<tcSpinfoPtr>(outgoing()[ix])->DMatrix());
}
// calculate the spin density matrix and return the answer
RhoDMatrix temp = _matrixelement.calculateDMatrix(Dout);
return temp;
}
}

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