EvtTVSPwave.cpp

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* Copyright 1998-2020 CERN for the benefit of the EvtGen authors       *
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* This file is part of EvtGen.                                         *
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#include "EvtGenModels/EvtTVSPwave.hh"

#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenBase/EvtTensor4C.hh"
#include "EvtGenBase/EvtVector4C.hh"

#include <stdlib.h>
#include <string>

std::string EvtTVSPwave::getName()
{
    return "TVS_PWAVE";
}

EvtDecayBase* EvtTVSPwave::clone()
{
    return new EvtTVSPwave;
}

void EvtTVSPwave::init()
{
    // check that there are 6 arguments
    checkNArg( 6 );
    checkNDaug( 2 );

    checkSpinParent( EvtSpinType::TENSOR );

    checkSpinDaughter( 0, EvtSpinType::VECTOR );
    checkSpinDaughter( 1, EvtSpinType::SCALAR );
}

void EvtTVSPwave::initProbMax()
{
    setProbMax( 0.5 );
}

void EvtTVSPwave::decay( EvtParticle* p )
{
    EvtComplex ap( getArg( 0 ) * cos( getArg( 1 ) ),
                   getArg( 0 ) * sin( getArg( 1 ) ) );
    EvtComplex ad( getArg( 2 ) * cos( getArg( 3 ) ),
                   getArg( 2 ) * sin( getArg( 3 ) ) );
    EvtComplex af( getArg( 4 ) * cos( getArg( 5 ) ),
                   getArg( 4 ) * sin( getArg( 5 ) ) );

    if ( ap != EvtComplex( 0.0, 0.0 ) || af != EvtComplex( 0.0, 0.0 ) ) {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "dfslkh8945wqh:In EvtTensorToVectorScalar.c\n";
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "P or F wave not yet implemented!! (ryd) \n";
    }

    p->initializePhaseSpace( getNDaug(), getDaugs() );

    EvtParticle* v;
    v = p->getDaug( 0 );
    EvtVector4R momv = v->getP4();
    double massv = v->mass();

    EvtComplex temp;
    temp = ad;
    double m_parent = p->mass();

    EvtVector4R p_parent;

    p_parent.set( m_parent, 0.0, 0.0, 0.0 );

    EvtVector4C pep0, pep1, pep2, pep3, pep4;
    EvtTensor4C pdual;

    EvtVector4C epsdual0, epsdual1, epsdual2;

    double norm = massv /
                  ( m_parent * momv.get( 0 ) * momv.d3mag() * momv.d3mag() );
    pdual = dual( EvtGenFunctions::directProd( norm * p_parent, momv ) );

    epsdual0 = pdual.cont1( v->epsParent( 0 ).conj() );
    epsdual1 = pdual.cont1( v->epsParent( 1 ).conj() );
    epsdual2 = pdual.cont1( v->epsParent( 2 ).conj() );

    pep0 = p->epsTensor( 0 ).cont1( momv );
    pep1 = p->epsTensor( 1 ).cont1( momv );
    pep2 = p->epsTensor( 2 ).cont1( momv );
    pep3 = p->epsTensor( 3 ).cont1( momv );
    pep4 = p->epsTensor( 4 ).cont1( momv );

    vertex( 0, 0, pep0 * epsdual0 );
    vertex( 1, 0, pep1 * epsdual0 );
    vertex( 2, 0, pep2 * epsdual0 );
    vertex( 3, 0, pep3 * epsdual0 );
    vertex( 4, 0, pep4 * epsdual0 );

    vertex( 0, 1, pep0 * epsdual1 );
    vertex( 1, 1, pep1 * epsdual1 );
    vertex( 2, 1, pep2 * epsdual1 );
    vertex( 3, 1, pep3 * epsdual1 );
    vertex( 4, 1, pep4 * epsdual1 );

    vertex( 0, 2, pep0 * epsdual2 );
    vertex( 1, 2, pep1 * epsdual2 );
    vertex( 2, 2, pep2 * epsdual2 );
    vertex( 3, 2, pep3 * epsdual2 );
    vertex( 4, 2, pep4 * epsdual2 );

    return;
}

std::string EvtTVSPwave::getParamName( int i )
{
    switch ( i ) {
        case 0:
            return "PWave";
        case 1:
            return "PWavePhase";
        case 2:
            return "DWave";
        case 3:
            return "DWavePhase";
        case 4:
            return "FWave";
        case 5:
            return "FWavePhase";
        default:
            return "";
    }
}

std::string EvtTVSPwave::getParamDefault( int i )
{
    switch ( i ) {
        case 0:
            return "0.0";
        case 1:
            return "0.0";
        case 2:
            return "1.0";
        case 3:
            return "0.0";
        case 4:
            return "0.0";
        case 5:
            return "0.0";
        default:
            return "";
    }
}