G4INCLNDeltaToNNKKbChannel.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 "G4INCLNDeltaToNNKKbChannel.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 NDeltaToNNKKbChannel::angularSlope = 2.;
  
  NDeltaToNNKKbChannel::NDeltaToNNKKbChannel(Particle *p1, Particle *p2)
    : particle1(p1), particle2(p2)
    {}
  
  NDeltaToNNKKbChannel::~NDeltaToNNKKbChannel(){}
  
  void NDeltaToNNKKbChannel::fillFinalState(FinalState *fs) {
    
        // ratio
        // D++ p -> p p K+ K0b  (6)
        //
        // D++ n -> p p K+ K- (3)
        // D++ n -> p p K0 K0b  (3)
        // D++ n -> p n K+ K0b  (3)
        //
        // D+  p -> p p K+ K- (3)
        // D+  p -> p p K0 K0b  (1)
        // D+  p -> p n K+ K0b  (3)
        //
        // D+  n -> p p K0 K- (2)
        // D+  n -> p n K+ K- (1)
        // D+  n -> p n K0 K0b  (3)
        // D+  n -> n n K+ K0b  (2)
        //
    
    const G4double sqrtS = KinematicsUtils::totalEnergyInCM(particle1, particle2);
    
    const G4int iso = ParticleTable::getIsospin(particle1->getType()) + ParticleTable::getIsospin(particle2->getType());
    G4int iso_n;
    if(particle1->isNucleon()) iso_n = ParticleTable::getIsospin(particle1->getType());
    else iso_n = ParticleTable::getIsospin(particle2->getType());
    
    ParticleType Nucleon1Type;
    ParticleType Nucleon2Type;
    ParticleType KaonType;
    ParticleType antiKaonType;
    
    const G4double rdm = Random::shoot();
    
    if(std::abs(iso) == 4){// D++ p
      Nucleon1Type = ParticleTable::getNucleonType(iso/4);
      Nucleon2Type = ParticleTable::getNucleonType(iso/4);
      KaonType = ParticleTable::getKaonType(iso/4);
      antiKaonType = ParticleTable::getAntiKaonType(iso/4);
    }
    else if(iso == 0){// D+  n
      if(rdm*8 < 2){
        Nucleon1Type = Proton;
        Nucleon2Type = Proton;
        KaonType = KZero;
        antiKaonType = KMinus;
      }
      else if(rdm*8 < 3){
        Nucleon1Type = Proton;
        Nucleon2Type = Neutron;
        KaonType = ParticleTable::getKaonType(-iso_n);
        antiKaonType = ParticleTable::getAntiKaonType(iso_n);
      }
      else if(rdm*8 < 6){
        Nucleon1Type = Proton;
        Nucleon2Type = Neutron;
        KaonType = ParticleTable::getKaonType(iso_n);
        antiKaonType = ParticleTable::getAntiKaonType(-iso_n);
      }
      else{
        Nucleon1Type = Neutron;
        Nucleon2Type = Neutron;
        KaonType = KPlus;
        antiKaonType = KZeroBar;
      }
    }
    else if(ParticleTable::getIsospin(particle1->getType()) == ParticleTable::getIsospin(particle2->getType())){// D+  p
      if(rdm*3 < 1){
        Nucleon1Type = ParticleTable::getNucleonType(iso/2);
        Nucleon2Type = ParticleTable::getNucleonType(iso/2);
        KaonType = ParticleTable::getKaonType(iso/2);
        antiKaonType = ParticleTable::getAntiKaonType(-iso/2);
      }
      else if(rdm*3 < 2){
        Nucleon1Type = ParticleTable::getNucleonType(iso/2);
        Nucleon2Type = ParticleTable::getNucleonType(iso/2);
        KaonType = ParticleTable::getKaonType(-iso/2);
        antiKaonType = ParticleTable::getAntiKaonType(iso/2);
      }
      else{
        Nucleon1Type = ParticleTable::getNucleonType(iso/2);
        Nucleon2Type = ParticleTable::getNucleonType(-iso/2);
        KaonType = ParticleTable::getKaonType(iso/2);
        antiKaonType = ParticleTable::getAntiKaonType(iso/2);
      }
    }
    else{// D++ n 
      if(rdm*5 < 2){
        Nucleon1Type = ParticleTable::getNucleonType(iso/2);
        Nucleon2Type = ParticleTable::getNucleonType(iso/2);
        KaonType = ParticleTable::getKaonType(iso/2);
        antiKaonType = ParticleTable::getAntiKaonType(-iso/2);
      }
      else if(rdm*5 < 4){
        Nucleon1Type = ParticleTable::getNucleonType(iso/2);
        Nucleon2Type = ParticleTable::getNucleonType(iso/2);
        KaonType = ParticleTable::getKaonType(-iso/2);
        antiKaonType = ParticleTable::getAntiKaonType(iso/2);
      }
      else{
        Nucleon1Type = ParticleTable::getNucleonType(iso/2);
        Nucleon2Type = ParticleTable::getNucleonType(-iso/2);
        KaonType = ParticleTable::getKaonType(iso/2);
        antiKaonType = ParticleTable::getAntiKaonType(iso/2);
      }
    }
    
        
    particle1->setType(Nucleon1Type);
    particle2->setType(Nucleon2Type);
    
    ParticleList list;
    list.push_back(particle1);
    list.push_back(particle2);
    const ThreeVector &rcol1 = particle1->getPosition();
    const ThreeVector zero1;
    const ThreeVector &rcol2 = particle2->getPosition();
    const ThreeVector zero2;
    Particle *kaon = new Particle(KaonType,zero1,rcol1);
    Particle *antikaon = new Particle(antiKaonType,zero2,rcol2);
    list.push_back(kaon);
    list.push_back(antikaon);
    
    if(Random::shoot()<0.5) PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);
    else PhaseSpaceGenerator::generateBiased(sqrtS, list, 1, angularSlope);
    
    fs->addModifiedParticle(particle1);
    fs->addModifiedParticle(particle2);
    fs->addCreatedParticle(kaon);
    fs->addCreatedParticle(antikaon);
  
  }
}