G4INCLOmegaNToPiPiNChannel.cc

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//
// INCL++ intra-nuclear cascade model
// Alain Boudard, CEA-Saclay, France
// Joseph Cugnon, University of Liege, Belgium
// Jean-Christophe David, CEA-Saclay, France
// Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
// Sylvie Leray, CEA-Saclay, France
// Davide Mancusi, CEA-Saclay, France
//
#define INCLXX_IN_GEANT4_MODE 1

#include "globals.hh"

#include "G4INCLOmegaNToPiPiNChannel.hh"
#include "G4INCLKinematicsUtils.hh"
#include "G4INCLBinaryCollisionAvatar.hh"
#include "G4INCLRandom.hh"
#include "G4INCLGlobals.hh"
#include "G4INCLLogger.hh"
#include <algorithm>
#include "G4INCLPhaseSpaceGenerator.hh"

namespace G4INCL {

  const G4double OmegaNToPiPiNChannel::angularSlope = 15.; // from piNToMultipions

  OmegaNToPiPiNChannel::OmegaNToPiPiNChannel(Particle *p1, Particle *p2)
    : ind2(0),
    particle1(p1),
    particle2(p2)
  {}

  OmegaNToPiPiNChannel::~OmegaNToPiPiNChannel(){

  }

  void OmegaNToPiPiNChannel::fillFinalState(FinalState *fs) {

    Particle * nucleon;
    Particle * omega;
    if(particle1->isNucleon()) {
      nucleon = particle1;
      omega = particle2;
    } else {
      nucleon = particle2;
      omega = particle1;
    }

        const G4double sqrtS = KinematicsUtils::totalEnergyInCM(nucleon, omega);
      
        ind2=ParticleTable::getIsospin(nucleon->getType());

        omega->setType(PiZero);

       ParticleType pionType;      
        G4double rs1=Random::shoot();
        if (ind2 == 1) {
          if (rs1*2. > 1.) pionType=PiZero;           
          else {
            pionType=PiPlus;
            ind2=-ind2;
          }
        }
        else {
          if (rs1*2. > 1.) pionType=PiZero;           
          else {
            pionType=PiMinus;
            ind2=-ind2;
            }
        }
      

        const ParticleType tn=ParticleTable::getNucleonType(ind2);
        nucleon->setType(tn);
      ParticleList list;
       list.push_back(nucleon);
      list.push_back(omega);
       const ThreeVector &rcolpion = omega->getPosition();
        const ThreeVector zero;
        Particle *newPion = new Particle(pionType,zero,rcolpion);
        list.push_back(newPion);
      fs->addModifiedParticle(nucleon);
       fs->addModifiedParticle(omega);
        fs->addCreatedParticle(newPion);

        PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);

  }

}