EvtLb2Baryonlnu.cpp

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#include "EvtGenModels/EvtLb2Baryonlnu.hh"

#include "EvtGenBase/EvtConst.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtIdSet.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtReport.hh"

#include "EvtGenModels/EvtLb2BaryonlnuFF.hh"

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

using namespace std;
#ifdef D0
#undef D0
#endif
EvtLb2Baryonlnu::EvtLb2Baryonlnu() : ffmodel( 0 ), calcamp( 0 )
{
}

EvtLb2Baryonlnu::~EvtLb2Baryonlnu()
{
    delete ffmodel;
    ffmodel = 0;
    delete calcamp;
    calcamp = 0;
}

std::string EvtLb2Baryonlnu::getName()
{
    return "Lb2Baryonlnu";
}

EvtDecayBase* EvtLb2Baryonlnu::clone()
{
    return new EvtLb2Baryonlnu;
}

void EvtLb2Baryonlnu::decay( EvtParticle* p )
{
    //This is a kludge to avoid warnings because the K_2* mass becomes to large.
    static 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 );

    calcamp->CalcAmp( p, _amp2, ffmodel, r00, r01, r10, r11 );
}

void EvtLb2Baryonlnu::initProbMax()
{
    static EvtId LAMB = EvtPDL::getId( "Lambda_b0" );
    static EvtId LAMBB = EvtPDL::getId( "anti-Lambda_b0" );
    static EvtId PRO = EvtPDL::getId( "p+" );
    static EvtId PROB = EvtPDL::getId( "anti-p-" );
    static EvtId N1440 = EvtPDL::getId( "N(1440)+" );
    static EvtId N1440B = EvtPDL::getId( "anti-N(1440)-" );
    static EvtId N1535 = EvtPDL::getId( "N(1535)+" );
    static EvtId N1535B = EvtPDL::getId( "anti-N(1535)-" );
    static EvtId N1520 = EvtPDL::getId( "N(1520)+" );
    static EvtId N1520B = EvtPDL::getId( "anti-N(1520)-" );
    static EvtId N1720 = EvtPDL::getId( "N(1720)+" );
    static EvtId N1720B = EvtPDL::getId( "anti-N(1720)-" );
    static EvtId N1650 = EvtPDL::getId( "N(1650)+" );
    static EvtId N1650B = EvtPDL::getId( "anti-N(1650)-" );
    static EvtId N1700 = EvtPDL::getId( "N(1700)+" );
    static EvtId N1700B = EvtPDL::getId( "anti-N(1700)-" );
    static EvtId N1710 = EvtPDL::getId( "N(1710)+" );
    static EvtId N1710B = EvtPDL::getId( "anti-N(1710)-" );
    static EvtId N1875 = EvtPDL::getId( "N(1875)+" );
    static EvtId N1875B = EvtPDL::getId( "anti-N(1875)-" );
    static EvtId N1900 = EvtPDL::getId( "N(1900)+" );
    static EvtId N1900B = EvtPDL::getId( "anti-N(1900)-" );
    static EvtId LAMCP = EvtPDL::getId( "Lambda_c+" );
    static EvtId LAMCM = EvtPDL::getId( "anti-Lambda_c-" );
    static EvtId LAMC1P = EvtPDL::getId( "Lambda_c(2593)+" );
    static EvtId LAMC1M = EvtPDL::getId( "anti-Lambda_c(2593)-" );
    static EvtId LAMC2P = EvtPDL::getId( "Lambda_c(2625)+" );
    static EvtId LAMC2M = EvtPDL::getId( "anti-Lambda_c(2625)-" );

    EvtId parnum, barnum;

    parnum = getParentId();
    barnum = getDaug( 0 );

    if ( ( parnum == LAMB && barnum == PRO ) ||
         ( parnum == LAMBB && barnum == PROB ) ||
         ( parnum == LAMB && barnum == N1440 ) ||
         ( parnum == LAMBB && barnum == N1440B ) ||
         ( parnum == LAMB && barnum == N1520 ) ||
         ( parnum == LAMBB && barnum == N1520B ) ||
         ( parnum == LAMB && barnum == N1535 ) ||
         ( parnum == LAMBB && barnum == N1535B ) ||
         ( parnum == LAMB && barnum == N1720 ) ||
         ( parnum == LAMBB && barnum == N1720B ) ||
         ( parnum == LAMB && barnum == N1650 ) ||
         ( parnum == LAMBB && barnum == N1650B ) ||
         ( parnum == LAMB && barnum == N1700 ) ||
         ( parnum == LAMBB && barnum == N1700B ) ||
         ( parnum == LAMB && barnum == N1710 ) ||
         ( parnum == LAMBB && barnum == N1710B ) ||
         ( parnum == LAMB && barnum == N1875 ) ||
         ( parnum == LAMBB && barnum == N1875B ) ||
         ( parnum == LAMB && barnum == N1900 ) ||
         ( parnum == LAMBB && barnum == N1900B ) ||
         ( parnum == LAMB && barnum == LAMCP ) ||
         ( parnum == LAMBB && barnum == LAMCM ) ||
         ( parnum == LAMB && barnum == LAMC1P ) ||
         ( parnum == LAMBB && barnum == LAMC1M ) ||
         ( parnum == LAMB && barnum == LAMC2P ) ||
         ( parnum == LAMBB && barnum == LAMC2M ) ) {
        setProbMax( 22000.0 );
    } else {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Decay does not have acceptable final state baryon for this model setting ProbMax = 0 "
            << endl;
        setProbMax( 0.0 );
    }
}

void EvtLb2Baryonlnu::init()
{
    if ( getNArg() != 4 ) {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "EvtLb2Baryonlnu 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" )
            << "EvtLb2Baryonlnu 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" )
            << "EvtLb2Baryonlnu 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" )
            << "EvtLb2Baryonlnu generator expected "
            << " a NEUTRINO 3rd daughter, found:" << EvtPDL::name( getDaug( 2 ) )
            << endl;
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Will terminate execution!" << endl;
        ::abort();
    }

    //set ffmodel
    ffmodel = new EvtLb2BaryonlnuFF;

    if ( baryontype == EvtSpinType::DIRAC ||
         baryontype == EvtSpinType::RARITASCHWINGER ) {
        calcamp = new EvtSLBaryonAmp;
    } else {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Wrong baryon spin type in EvtLb2Baryonlnu.cc "
            << "Expected spin type " << EvtSpinType::DIRAC
            << ", found spin type " << baryontype << endl;
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Will terminate execution!" << endl;
        ::abort();
    }
}