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EvtHQET.cpp
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EvtHQET.cpp
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/***********************************************************************
* 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/EvtHQET.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenBase/EvtSemiLeptonicScalarAmp.hh"
#include "EvtGenBase/EvtSemiLeptonicVectorAmp.hh"
#include "EvtGenModels/EvtHQETFF.hh"
#include <assert.h>
#include <stdlib.h>
#include <string>
using std::endl;
std::string EvtHQET::getName()
{
return "HQET";
}
EvtDecayBase* EvtHQET::clone()
{
return new EvtHQET;
}
void EvtHQET::decay( EvtParticle* p )
{
p->initializePhaseSpace( getNDaug(), getDaugs() );
calcamp->CalcAmp( p, _amp2, hqetffmodel.get() );
}
void EvtHQET::initProbMax()
{
EvtId parnum, mesnum, lnum, nunum;
parnum = getParentId();
mesnum = getDaug( 0 );
lnum = getDaug( 1 );
nunum = getDaug( 2 );
double mymaxprob = calcamp->CalcMaxProb( parnum, mesnum, lnum, nunum,
hqetffmodel.get() );
setProbMax( mymaxprob );
}
void EvtHQET::init()
{
checkNDaug( 3 );
//We expect the parent to be a scalar
//and the daughters to be X lepton neutrino
checkSpinParent( EvtSpinType::SCALAR );
checkSpinDaughter( 1, EvtSpinType::DIRAC );
checkSpinDaughter( 2, EvtSpinType::NEUTRINO );
EvtSpinType::spintype d1type = EvtPDL::getSpinType( getDaug( 0 ) );
if ( d1type == EvtSpinType::SCALAR ) {
checkNArg( 1, 2 );
if ( getNArg() == 1 )
hqetffmodel = std::make_unique<EvtHQETFF>( getArg( 0 ) );
else
hqetffmodel = std::make_unique<EvtHQETFF>( getArg( 0 ), getArg( 1 ) );
calcamp = std::make_unique<EvtSemiLeptonicScalarAmp>();
} else if ( d1type == EvtSpinType::VECTOR ) {
checkNArg( 3, 4 );
if ( getNArg() == 3 )
hqetffmodel = std::make_unique<EvtHQETFF>( getArg( 0 ), getArg( 1 ),
getArg( 2 ) );
else
hqetffmodel = std::make_unique<EvtHQETFF>( getArg( 0 ), getArg( 1 ),
getArg( 2 ), getArg( 3 ) );
calcamp = std::make_unique<EvtSemiLeptonicVectorAmp>();
} else {
EvtGenReport( EVTGEN_ERROR, "EvtGen" )
<< "HQET model handles only scalar and vector meson daughters. Sorry."
<< endl;
::abort();
}
}

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