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 "EvtGenBase/EvtPatches.hh"
#include <stdlib.h>
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenModels/EvtISGW.hh"
#include <string>
#include "EvtGenModels/EvtISGWFF.hh"
#include "EvtGenBase/EvtSemiLeptonicScalarAmp.hh"
#include "EvtGenBase/EvtSemiLeptonicVectorAmp.hh"
#include "EvtGenBase/EvtSemiLeptonicTensorAmp.hh"
 
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; 
  }
  
}