EvtTaulnunu.cpp

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#include "EvtGenModels/EvtTaulnunu.hh"
 
#include "EvtGenBase/EvtDiracSpinor.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenBase/EvtVector4C.hh"
 
#include <iostream>
#include <stdlib.h>
#include <string>
 
std::string EvtTaulnunu::getName() const
{
    return "TAULNUNU";
}
 
EvtDecayBase* EvtTaulnunu::clone() const
{
    return new EvtTaulnunu;
}
 
void EvtTaulnunu::init()
{
    // check that there are 0 arguments
    checkNArg( 0 );
    checkNDaug( 3 );
 
    checkSpinParent( EvtSpinType::DIRAC );
 
    checkSpinDaughter( 0, EvtSpinType::DIRAC );
    checkSpinDaughter( 1, EvtSpinType::NEUTRINO );
    checkSpinDaughter( 2, EvtSpinType::NEUTRINO );
}
 
void EvtTaulnunu::initProbMax()
{
    setProbMax( 650.0 );
}
 
void EvtTaulnunu::decay( EvtParticle* p )
{
    static const EvtId TAUM = EvtPDL::getId( "tau-" );
 
    p->initializePhaseSpace( getNDaug(), getDaugs() );
 
    EvtParticle *l, *nul, *nut;
 
    l = p->getDaug( 0 );
    nul = p->getDaug( 1 );
    nut = p->getDaug( 2 );
 
    EvtVector4C l1, l2, tau1, tau2;
 
    if ( p->getId() == TAUM ) {
        tau1 = EvtLeptonVACurrent( nut->spParentNeutrino(), p->sp( 0 ) );
        tau2 = EvtLeptonVACurrent( nut->spParentNeutrino(), p->sp( 1 ) );
        l1 = EvtLeptonVACurrent( l->spParent( 0 ), nul->spParentNeutrino() );
        l2 = EvtLeptonVACurrent( l->spParent( 1 ), nul->spParentNeutrino() );
 
    } else {
        tau1 = EvtLeptonVACurrent( p->sp( 0 ), nut->spParentNeutrino() );
        tau2 = EvtLeptonVACurrent( p->sp( 1 ), nut->spParentNeutrino() );
        l1 = EvtLeptonVACurrent( nul->spParentNeutrino(), l->spParent( 0 ) );
        l2 = EvtLeptonVACurrent( nul->spParentNeutrino(), l->spParent( 1 ) );
    }
 
    vertex( 0, 0, tau1 * l1 );
    vertex( 0, 1, tau1 * l2 );
    vertex( 1, 0, tau2 * l1 );
    vertex( 1, 1, tau2 * l2 );
 
    return;
}