EvtLb2plnuLCSR.cpp

Go to the documentation of this file.

/***********************************************************************
* Copyright 1998-2020 CERN for the benefit of the EvtGen authors       *
*                                                                      *
* This file is part of EvtGen.                                         *
*                                                                      *
* EvtGen is free software: you can redistribute it and/or modify       *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or    *
* (at your option) any later version.                                  *
*                                                                      *
* EvtGen is distributed in the hope that it will be useful,            *
* but WITHOUT ANY WARRANTY; without even the implied warranty of       *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
* GNU General Public License for more details.                         *
*                                                                      *
* You should have received a copy of the GNU General Public License    *
* along with EvtGen.  If not, see <https://www.gnu.org/licenses/>.     *
***********************************************************************/

#include "EvtGenModels/EvtLb2plnuLCSR.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/EvtLb2plnuLCSRFF.hh"

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

using namespace std;
#ifdef D0
#undef D0
#endif
EvtLb2plnuLCSR::EvtLb2plnuLCSR() : ffmodel( 0 ), calcamp( 0 )
{
}

EvtLb2plnuLCSR::~EvtLb2plnuLCSR()
{
    delete ffmodel;
    ffmodel = 0;
    delete calcamp;
    calcamp = 0;
}

std::string EvtLb2plnuLCSR::getName()
{
    return "Lb2plnuLCSR";
}

EvtDecayBase* EvtLb2plnuLCSR::clone()
{
    return new EvtLb2plnuLCSR;
}

void EvtLb2plnuLCSR::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 EvtLb2plnuLCSR::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-" );

    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 EvtLb2plnuLCSR::init()
{
    if ( getNArg() != 4 ) {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "EvtLb2plnuLCSR 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" )
            << "EvtLb2plnuLCSR 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" )
            << "EvtLb2plnuLCSR 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" )
            << "EvtLb2plnuLCSR 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 EvtLb2plnuLCSRFF;

    if ( baryontype == EvtSpinType::DIRAC ) {
        calcamp = new EvtSLBaryonAmp;
    } else {
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Wrong baryon spin type in EvtLb2plnuLCSR.cc "
            << "Expected spin type " << EvtSpinType::DIRAC
            << ", found spin type " << baryontype << endl;
        EvtGenReport( EVTGEN_ERROR, "EvtGen" )
            << "Will terminate execution!" << endl;
        ::abort();
    }
}