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src/EvtGenModels/EvtRareLbToLllFFBase.cpp

/*********************************************************************** /***********************************************************************
* Copyright 1998-2020 CERN for the benefit of the EvtGen authors * * Copyright 1998-2022 CERN for the benefit of the EvtGen authors *
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* This file is part of EvtGen. * * This file is part of EvtGen. *
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* EvtGen is free software: you can redistribute it and/or modify * * EvtGen is free software: you can redistribute it and/or modify *
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} }
EvtRareLbToLllFFBase::EvtRareLbToLllFFBase() : EvtRareLbToLllFFBase::EvtRareLbToLllFFBase() :
natural_( "Lambda0", "anti-Lambda0", "Lambda(1520)0", "anti-Lambda(1520)0", natural_( "Lambda0", "anti-Lambda0", "Lambda(1520)0", "anti-Lambda(1520)0",
"Lambda(1600)0", "anti-Lambda(1600)0" ) "Lambda(1600)0", "anti-Lambda(1600)0" )
{ {
} }
bool EvtRareLbToLllFFBase::isNatural( EvtParticle* lambda ) bool EvtRareLbToLllFFBase::isNatural( const EvtParticle& lambda ) const
{ {
return natural_.contains( lambda->getId() ); return natural_.contains( lambda.getId() );
} }
double EvtRareLbToLllFFBase::calculateVdotV( EvtParticle* parent, double EvtRareLbToLllFFBase::calculateVdotV( const EvtParticle& parent,
EvtParticle* lambda ) const const EvtParticle& lambda ) const
{ {
EvtVector4R p4parent; EvtVector4R p4parent;
p4parent.set( parent->mass(), 0, 0, 0 ); p4parent.set( parent.mass(), 0, 0, 0 );
EvtVector4R p4lambda = lambda->getP4(); EvtVector4R p4lambda = lambda.getP4();
double M = lambda->mass(); const double M = lambda.mass();
double MB = parent->mass(); const double MB = parent.mass();
return p4parent.cont( p4lambda ) / ( MB * M ); return p4parent.cont( p4lambda ) / ( MB * M );
// return E_Lambda/M_Lambda // return E_Lambda/M_Lambda
} }
double EvtRareLbToLllFFBase::calculateVdotV( EvtParticle* parent, double EvtRareLbToLllFFBase::calculateVdotV( const EvtParticle& parent,
EvtParticle* lambda, const EvtParticle& lambda,
const double qsq ) const const double qsq ) const
{ {
double M = lambda->mass(); const double M = lambda.mass();
double MB = parent->mass(); const double MB = parent.mass();
double E = ( MB * MB - M * M - qsq ) / ( 2. * MB ); double E = ( MB * MB - M * M - qsq ) / ( 2. * MB );
return E / M; return E / M;
} }