G4INCLNpiToLKpiChannel.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 "G4INCLNpiToLKpiChannel.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 NpiToLKpiChannel::angularSlope = 6.; // What is the exact effect? Sould be check
  
  NpiToLKpiChannel::NpiToLKpiChannel(Particle *p1, Particle *p2)
    : particle1(p1), particle2(p2)
    {}
  
  NpiToLKpiChannel::~NpiToLKpiChannel(){}
  
  void NpiToLKpiChannel::fillFinalState(FinalState *fs) {
    
        // ratio
        // p pi+ (1)  p pi0 (3/2)   p pi- (2)
        //
        // p pi0 -> L K+ pi0 (1/2)
        // all the others (1)
        
    Particle *nucleon;
    Particle *pion;
        
    if(particle1->isNucleon()){
      nucleon = particle1;
      pion = particle2;
    }
    else{
      nucleon = particle2;
      pion = particle1;
    }
    
    const G4double sqrtS = KinematicsUtils::totalEnergyInCM(nucleon, pion);
    
    const G4int iso = ParticleTable::getIsospin(nucleon->getType()) + ParticleTable::getIsospin(pion->getType());
    G4double rdm = Random::shoot();
    
    ParticleType KaonType;
    
    if(iso == 3 || iso == -3){
      KaonType = ParticleTable::getKaonType(iso/3);
    }
    else if(pion->getType() == PiZero){
      if(rdm*3. < 1.){
        KaonType = ParticleTable::getKaonType(iso);
      }
      else{
        KaonType = ParticleTable::getKaonType(-iso);
        pion->setType(ParticleTable::getPionType(2*iso));
      }
    }
    else{
      if(rdm < 0.5){
        KaonType = ParticleTable::getKaonType(-iso);
      }
      else{
        KaonType = ParticleTable::getKaonType(iso);
        pion->setType(PiZero);
      }
    }
    
    nucleon->setType(Lambda);
    
    ParticleList list;
    list.push_back(nucleon);
    list.push_back(pion);
    const ThreeVector &rcol = nucleon->getPosition();
    const ThreeVector zero;
    Particle *kaon = new Particle(KaonType,zero,rcol);
    list.push_back(kaon);
    
    PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);
    
    INCL_DEBUG("NpiToLKpi " << (kaon->getMomentum().theta()) * 180. / G4INCL::Math::pi << '\n');
    
    fs->addModifiedParticle(nucleon);
    fs->addModifiedParticle(pion);
    fs->addCreatedParticle(kaon);
    
  }
}