EvtLb2plnuLQCD.cpp

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#include "EvtGenModels/EvtLb2plnuLQCD.hh"
 
#include "EvtGenBase/EvtConst.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtIdSet.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtReport.hh"
 
#include "EvtGenModels/EvtLb2plnuLQCDFF.hh"
 
#include <stdlib.h>
#include <string>
 
using namespace std;
#ifdef D0
#undef D0
#endif
EvtLb2plnuLQCD::EvtLb2plnuLQCD() : m_ffmodel( nullptr ), m_calcamp( nullptr )
{
}
 
EvtLb2plnuLQCD::~EvtLb2plnuLQCD()
{
    delete m_ffmodel;
    m_ffmodel = nullptr;
    delete m_calcamp;
    m_calcamp = nullptr;
}
 
std::string EvtLb2plnuLQCD::getName() const
{
    return "Lb2plnuLQCD";
}
 
EvtDecayBase* EvtLb2plnuLQCD::clone() const
{
    return new EvtLb2plnuLQCD;
}
 
void EvtLb2plnuLQCD::decay( EvtParticle* p )
{
    //This is a kludge to avoid warnings because the K_2* mass becomes to large.
    static const EvtIdSet regenerateMasses{
        "K_2*+", "K_2*-",     "K_2*0", "anti-K_2*0", "K_1+",  "K_1-",
        "K_10",  "anti-K_10", "D'_1+", "D'_1-",      "D'_10", "anti-D'_10" };
 
    if ( regenerateMasses.contains( getDaug( 0 ) ) ) {
        p->resetFirstOrNot();
    }
 
    p->initializePhaseSpace( getNDaug(), getDaugs() );
 
    EvtComplex r00( getArg( 0 ), 0.0 );
    EvtComplex r01( getArg( 1 ), 0.0 );
    EvtComplex r10( getArg( 2 ), 0.0 );
    EvtComplex r11( getArg( 3 ), 0.0 );
 
    m_calcamp->CalcAmp( p, m_amp2, m_ffmodel, r00, r01, r10, r11 );
}
 
void EvtLb2plnuLQCD::initProbMax()
{
    static const EvtId LAMB = EvtPDL::getId( "Lambda_b0" );
    static const EvtId LAMBB = EvtPDL::getId( "anti-Lambda_b0" );
    static const EvtId PRO = EvtPDL::getId( "p+" );
    static const EvtId PROB = EvtPDL::getId( "anti-p-" );
 
    EvtId parnum, barnum;
 
    parnum = getParentId();
    barnum = getDaug( 0 );
 
    if ( ( parnum == LAMB && barnum == PRO ) ||
         ( parnum == LAMBB && barnum == PROB ) ) {
        setProbMax( 22000.0 );
    } else {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Decay does not have Lb->p setting ProbMax = 0 " << endl;
        setProbMax( 0.0 );
    }
}
 
void EvtLb2plnuLQCD::init()
{
    if ( getNArg() != 4 ) {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "EvtLb2plnuLQCD generator expected "
            << " 4 arguments but found:" << getNArg() << endl;
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Will terminate execution!" << endl;
        ::abort();
    }
 
    if ( getNDaug() != 3 ) {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Wrong number of daughters in EvtLb2plnu.cc "
            << " 3 daughters expected but found: " << getNDaug() << endl;
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Will terminate execution!" << endl;
        ::abort();
    }
 
    //We expect the parent to be a dirac particle
    //and the daughters to be X lepton neutrino
 
    EvtSpinType::spintype parenttype = EvtPDL::getSpinType( getParentId() );
    EvtSpinType::spintype baryontype = EvtPDL::getSpinType( getDaug( 0 ) );
    EvtSpinType::spintype leptontype = EvtPDL::getSpinType( getDaug( 1 ) );
    EvtSpinType::spintype neutrinotype = EvtPDL::getSpinType( getDaug( 2 ) );
 
    if ( parenttype != EvtSpinType::DIRAC ) {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "EvtLb2plnuLQCD generator expected "
            << " a DIRAC parent, found:" << EvtPDL::name( getParentId() )
            << endl;
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Will terminate execution!" << endl;
        ::abort();
    }
    if ( leptontype != EvtSpinType::DIRAC ) {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "EvtLb2plnuLQCD generator expected "
            << " a DIRAC 2nd daughter, found:" << EvtPDL::name( getDaug( 1 ) )
            << endl;
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Will terminate execution!" << endl;
        ::abort();
    }
    if ( neutrinotype != EvtSpinType::NEUTRINO ) {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "EvtLb2plnuLQCD generator expected "
            << " a NEUTRINO 3rd daughter, found:" << EvtPDL::name( getDaug( 2 ) )
            << endl;
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Will terminate execution!" << endl;
        ::abort();
    }
 
    //set m_ffmodel
    m_ffmodel = new EvtLb2plnuLQCDFF;
 
    if ( baryontype == EvtSpinType::DIRAC ) {
        m_calcamp = new EvtSLBaryonAmp;
    } else {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Wrong baryon spin type in EvtLb2plnuLQCD.cc "
            << "Expected spin type " << EvtSpinType::DIRAC
            << ", found spin type " << baryontype << endl;
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Will terminate execution!" << endl;
        ::abort();
    }
}