EvtISGW.cc

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//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 1998      Caltech, UCSB
//
// Module: EvtISGW.cc
//
// Description: Routine to implement semileptonic decays according
//              to the model ISGW
//
// Modification history:
//
//    DJL/RYD     September 25, 1996         Module created
//
//------------------------------------------------------------------------
//
#include "EvtISGW.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/EvtSemiLeptonicTensorAmp.hh"
#include "../EvtGenBase/EvtSemiLeptonicVectorAmp.hh"
#include "EvtISGWFF.hh"
#include <stdlib.h>
#include <string>
 
EvtISGW::~EvtISGW() {}
 
void EvtISGW::getName( std::string& model_name ) { model_name = "ISGW"; }
 
EvtDecayBase* EvtISGW::clone() { return new EvtISGW; }
 
void EvtISGW::decay( EvtParticle* p ) {
 
  p->initializePhaseSpace( getNDaug(), getDaugs() );
 
  calcamp->CalcAmp( p, _amp2, isgwffmodel );
  return;
}
 
void EvtISGW::init() {
 
  checkNArg( 0 );
  checkNDaug( 3 );
 
  // We expect the parent to be a scalar
  // and the daughters to be X lepton neutrino
 
  EvtSpinType::spintype mesontype = EvtPDL::getSpinType( getDaug( 0 ) );
 
  checkSpinParent( EvtSpinType::SCALAR );
  checkSpinDaughter( 1, EvtSpinType::DIRAC );
  checkSpinDaughter( 2, EvtSpinType::NEUTRINO );
 
  isgwffmodel = new EvtISGWFF;
 
  if ( mesontype == EvtSpinType::SCALAR ) { calcamp = new EvtSemiLeptonicScalarAmp; }
  if ( mesontype == EvtSpinType::VECTOR ) { calcamp = new EvtSemiLeptonicVectorAmp; }
  if ( mesontype == EvtSpinType::TENSOR ) { calcamp = new EvtSemiLeptonicTensorAmp; }
}