G4INCLNKbToNKbpiChannel.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 "G4INCLNKbToNKbpiChannel.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 NKbToNKbpiChannel::angularSlope = 4.; // What is the exact effect? Sould be check
  
  NKbToNKbpiChannel::NKbToNKbpiChannel(Particle *p1, Particle *p2)
    : particle1(p1), particle2(p2)
    {}
  
  NKbToNKbpiChannel::~NKbToNKbpiChannel(){}
  
  void NKbToNKbpiChannel::fillFinalState(FinalState *fs) {
    
        // ratio
        // p K- (28)    p K0b (20)
        //
        // p K- -> p K- pi0      (6)*
        // p K- -> p K0b pi-     (7)*
        // p K- -> n K- pi+      (9)*
        // p K- -> n K0b pi0     (6)
        //
        // p K0b -> p K0b pi0    (4)
        // p K0b -> p K- pi+     (10)*
        // p K0b -> n K0b pi+    (6)*
        //
        
    Particle *nucleon;
    Particle *kaon;
        
    if(particle1->isNucleon()){
      nucleon = particle1;
      kaon = particle2;
    }
    else{
      nucleon = particle2;
      kaon = particle1;
    }
    
    const G4double sqrtS = KinematicsUtils::totalEnergyInCM(nucleon, kaon);
    
    const G4int iso = ParticleTable::getIsospin(nucleon->getType()) + ParticleTable::getIsospin(kaon->getType());
    const G4int iso_n = ParticleTable::getIsospin(nucleon->getType());
    G4double rdm = Random::shoot();
    
    ParticleType PionType;
    
    if(iso == 2 || iso == -2){
      if(rdm*5. < 1.){
        PionType = PiZero;
      }
      else if(rdm*2. < 1.){
        PionType = ParticleTable::getPionType(iso);
        nucleon->setType(ParticleTable::getNucleonType(-iso/2));
      }
      else{
        PionType = ParticleTable::getPionType(iso);
        kaon->setType(ParticleTable::getAntiKaonType(-iso/2));
      }
    }
    else{
      if(rdm*28. < 6.){
        PionType = PiZero;
      }
      else if(rdm*28. < 13.){
        kaon->setType(ParticleTable::getAntiKaonType(iso_n));
        PionType = ParticleTable::getPionType(-2*iso_n);
      }
      else if(rdm*28. < 22.){
        nucleon->setType(ParticleTable::getNucleonType(-iso_n));
        PionType = ParticleTable::getPionType(2*iso_n);
      }
      else{
        kaon->setType(ParticleTable::getAntiKaonType(iso_n));
        nucleon->setType(ParticleTable::getNucleonType(-iso_n));
        PionType = PiZero;
      }
    }
    
    ParticleList list;
    list.push_back(nucleon);
    list.push_back(kaon);
    const ThreeVector &rcol = nucleon->getPosition();
    const ThreeVector zero;
    Particle *pion = new Particle(PionType,zero,rcol);
    list.push_back(pion);
    
    PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);
    
    fs->addModifiedParticle(nucleon);
    fs->addModifiedParticle(kaon);
    fs->addCreatedParticle(pion);
    
  }
}