ATO-78 - Technical changes to compare different calibrations

[u/mrichter/AliRoot.git] / TEvtGen / EvtGenModels / EvtVPHOtoV.cpp

//--------------------------------------------------------------------------
//
// 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) 2004      Cornell
//
// Module: EvtVPHOtoV.cc
//
// Description: Routine to decay vpho -> vector
//
// Modification history:
//
//    Ryd       March 9, 2004       Module created
//
//------------------------------------------------------------------------
// 
#include <stdlib.h>
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtGenKine.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtVector4C.hh"
#include "EvtGenBase/EvtVector4R.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenModels/EvtVPHOtoV.hh"
#include <string>

EvtVPHOtoV::~EvtVPHOtoV() {}

std::string EvtVPHOtoV::getName(){

  return "VPHOTOV"; 
    
}


EvtDecayBase* EvtVPHOtoV::clone(){

  return new EvtVPHOtoV;

}

void EvtVPHOtoV::init(){

  // check that there are 0 arguments
  checkNArg(0);

  // check that there are 1 daughters
  checkNDaug(1);

  // check the parent and daughter spins
  checkSpinParent(EvtSpinType::VECTOR);
  checkSpinDaughter(0,EvtSpinType::VECTOR);
}

void EvtVPHOtoV::initProbMax() {

   setProbMax(1.0);

}      

void EvtVPHOtoV::decay( EvtParticle *p){

  p->initializePhaseSpace(getNDaug(),getDaugs());

  EvtParticle* d=p->getDaug(0);

  d->setP4(p->getP4Restframe());  

  vertex(0,0,p->eps(0)*p->epsParent(0).conj());
  vertex(1,0,p->eps(1)*p->epsParent(0).conj());
  vertex(2,0,p->eps(2)*p->epsParent(0).conj());

  vertex(0,1,p->eps(0)*p->epsParent(1).conj());
  vertex(1,1,p->eps(1)*p->epsParent(1).conj());
  vertex(2,1,p->eps(2)*p->epsParent(1).conj());

  vertex(0,2,p->eps(0)*p->epsParent(2).conj());
  vertex(1,2,p->eps(1)*p->epsParent(2).conj());
  vertex(2,2,p->eps(2)*p->epsParent(2).conj());

  return;
}