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SSFFHVertex.cc
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// -*- C++ -*-
//
// SSFFHVertex.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 SSFFHVertex class.
//
#include "SSFFHVertex.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 <cassert>
using namespace ThePEG::Helicity;
using namespace Herwig;
SSFFHVertex::SSFFHVertex() : thetanb(0.0), theMw(ZERO),
theSa(0.0), theSb(0.0),
theCa(0.0), theCb(0.0),
theFLast(make_pair(0,0)), theGlast(0.),
theq2last(), theMassLast(make_pair(ZERO,ZERO)) {
orderInGem(1);
orderInGs(0);
}
void SSFFHVertex::doinit() {
int higgs[] = { 25, 35, 36 };
for ( long h = 0; h < 3; ++h ) {
//neutral higgs
// quarks
for(long ix=1;ix<7;++ix)
addToList(-ix,ix,higgs[h]);
// charged leptons
for(long ix=11;ix<16;ix+=2)
addToList(-ix,ix,higgs[h]);
}
for(long ix=1;ix<6;ix+=2) {
//outgoing H+
addToList(-ix-1, ix, 37);
//outgoing H-
addToList(-ix ,ix+1,-37);
}
for(long ix=11;ix<16;ix+=2) {
//outgoing H+
addToList(-ix-1, ix, 37);
//outgoing H-
addToList(-ix ,ix+1,-37);
}
theMSSM = dynamic_ptr_cast<tMSSMPtr>(generator()->standardModel());
if( !theMSSM )
throw InitException()
<< "SSFFHVertex::doinit() - The pointer to the MSSM object is null!"
<< Exception::abortnow;
theMw = getParticleData(ParticleID::Wplus)->mass();
thetanb = theMSSM->tanBeta();
theSb = thetanb/sqrt(1. + sqr(thetanb));
theCb = sqrt( 1. - sqr(theSb) );
theSa = sin(theMSSM->higgsMixingAngle());
theCa = sqrt(1. - sqr(theSa));
FFSVertex::doinit();
}
void SSFFHVertex::persistentOutput(PersistentOStream & os) const {
os << theMSSM << thetanb << ounit(theMw,GeV) << theSa
<< theSb << theCa << theCb;
}
void SSFFHVertex::persistentInput(PersistentIStream & is, int) {
is >> theMSSM >> thetanb >> iunit(theMw,GeV) >> theSa
>> theSb >> theCa >> theCb;
}
// Static variable needed for the type description system in ThePEG.
DescribeClass<SSFFHVertex,FFSVertex>
describeHerwigSSFFHVertex("Herwig::SSFFHVertex", "HwSusy.so");
void SSFFHVertex::Init() {
static ClassDocumentation<SSFFHVertex> documentation
("The coupling of the higgs bosons to SM fermions in the MSSM");
}
void SSFFHVertex::setCoupling(Energy2 q2, tcPDPtr particle1,
tcPDPtr particle2,tcPDPtr particle3) {
long f1ID(abs(particle1->id())), f2ID(abs(particle2->id())),
higgsID(particle3->id());
// check higgs
assert( higgsID == ParticleID::h0 || higgsID == ParticleID::H0 ||
higgsID == ParticleID::A0 || abs(higgsID) == ParticleID::Hplus );
// check fermions
assert(!( ((f1ID > 6 && f1ID < 11) || f1ID > 16 ) ||
((f2ID > 6 && f1ID < 11) || f2ID > 16 ) ));
if( q2 != theq2last || theGlast==0.) {
theGlast = weakCoupling(q2);
}
if( q2 != theq2last || theFLast.first != f1ID) {
theMassLast.first = theMSSM->mass(q2,particle1);
theFLast.first = f1ID;
}
if( q2 != theq2last || theFLast.second != f2ID) {
theMassLast.second = theMSSM->mass(q2,particle2);
theFLast.second = f2ID;
}
theq2last = q2;
Complex coup(0.);
Complex lcoup(1.),rcoup(1.);
if( higgsID == ParticleID::h0 || higgsID == ParticleID::H0 ||
higgsID == ParticleID::A0 ) {
coup = 0.5*theMassLast.first/theMw;
if( higgsID == ParticleID::h0 ) {
if( f1ID % 2 == 0 )
coup *= -theCa/theSb;
else
coup *= theSa/theCb;
}
else if( higgsID == ParticleID::H0 ) {
if( f1ID % 2 == 0 )
coup *= -theSa/theSb;
else
coup *= -theCa/theCb;
}
else {
if( f1ID % 2 == 0 )
coup /= thetanb;
else
coup *= thetanb;
coup *= Complex(0.,-1.);
rcoup = -1.;
}
}
//H+
else {
if( f1ID % 2 == 0 ) {
lcoup = theMassLast.first /thetanb/theMw;
rcoup = theMassLast.second*thetanb/theMw;
}
else {
lcoup = theMassLast.second/thetanb/theMw;
rcoup = theMassLast.first *thetanb/theMw;
}
coup = sqrt(0.5);
if( higgsID > 0 ) swap(lcoup,rcoup);
}
norm(theGlast*coup);
left (lcoup);
right(rcoup);
}

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