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MEee2ZH.cc
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MEee2ZH.cc
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// -*- C++ -*-
//
// This is the implementation of the non-inlined, non-templated member
// functions of the MEee2ZH class.
//
#include "MEee2ZH.h"
#include "ThePEG/Utilities/DescribeClass.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
#include "ThePEG/PDT/EnumParticles.h"
#include "ThePEG/MatrixElement/Tree2toNDiagram.h"
#include "ThePEG/PDT/DecayMode.h"
#include "Herwig/Models/StandardModel/StandardModel.h"
using namespace Herwig;
// The following static variable is needed for the type
// description system in ThePEG.
DescribeNoPIOClass<MEee2ZH,MEfftoVH>
describeHerwigMEee2ZH("Herwig::MEee2ZH", "HwMELepton.so");
void MEee2ZH::Init() {
static ClassDocumentation<MEee2ZH> documentation
("There is no documentation for the MEee2ZH class");
}
void MEee2ZH::getDiagrams() const {
tcPDPtr eplus = getParticleData(ParticleID::eplus );
tcPDPtr eminus = getParticleData(ParticleID::eminus );
// find possible Z decays
typedef Selector<tDMPtr> DecaySelector;
DecaySelector Zdec = Z0()->decaySelector();
vector<PDPair> Zdecays;
for(DecaySelector::const_iterator cit=Zdec.begin();cit!=Zdec.end();++cit) {
if(cit->second->orderedProducts().size()!=2) continue;
if(cit->second->orderedProducts()[0]->id()>0)
Zdecays.push_back(make_pair(cit->second->orderedProducts()[0],
cit->second->orderedProducts()[1]));
else
Zdecays.push_back(make_pair(cit->second->orderedProducts()[1],
cit->second->orderedProducts()[0]));
}
// create the diagrams
for(unsigned int ix=0;ix<Zdecays.size();++ix) {
add(new_ptr((Tree2toNDiagram(2), eminus, eplus,
1, Z0(), 3, higgs(), 3, Z0(),
5, Zdecays[ix].first,5, Zdecays[ix].second,-1)));
}
}
void MEee2ZH::doinit() {
// get the vedrtex pointers from the SM object
tcHwSMPtr hwsm= dynamic_ptr_cast<tcHwSMPtr>(standardModel());
if(!hwsm)
throw InitException() << "Wrong type of StandardModel object in "
<< "MEeeto2ZH::doinit() the Herwig"
<< " version must be used"
<< Exception::runerror;
// set the vertex
setWWHVertex(hwsm->vertexWWH());
higgs(getParticleData(ParticleID::h0));
MEfftoVH::doinit();
}

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