G4INCLNKToNK2piChannel.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 "G4INCLNKToNK2piChannel.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 NKToNK2piChannel::angularSlope = 4.; // What is the exact effect? Sould be check
    
    NKToNK2piChannel::NKToNK2piChannel(Particle *p1, Particle *p2)
        : particle1(p1), particle2(p2)
        {}
    
    NKToNK2piChannel::~NKToNK2piChannel(){}
    
    void NKToNK2piChannel::fillFinalState(FinalState *fs) {
        
        // p K+ -> p K+ pi+ pi- (1)
        // p K+ -> p K+ pi0 pi0 (1/8)
        // p K+ -> p K0 pi+ pi0 (1)
        // p K+ -> n K+ pi+ pi0 (1/2)
        // p K+ -> n K0 pi+ pi+ (1/4)
        //
        // p K0 -> p K0 pi+ pi- (1)
        // p K0 -> p K0 pi0 pi0 (1/8)
        // p K0 -> p K+ pi0 pi- (1)
        // p K0 -> n K+ pi+ pi- (1/4)
        // p K0 -> n K+ pi0 pi0 (1/4)
        // p K0 -> n K0 pi+ pi0 (1/2)
        
        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 Pion1Type;
        ParticleType Pion2Type;
        
        if(iso == 2 || iso == -2){
            if(rdm*23. < 8.){
                Pion1Type = PiPlus;
                Pion2Type = PiMinus;
            }
            else if(rdm*23. < 9.){
                Pion1Type = PiZero;
                Pion2Type = PiZero;
            }
            else if(rdm*23. < 17.){
                Pion1Type = ParticleTable::getPionType(iso);
                Pion2Type = PiZero;
                kaon->setType(ParticleTable::getKaonType(-iso/2));
            }
            else if(rdm*23. < 21.){
                Pion1Type = ParticleTable::getPionType(iso);
                Pion2Type = PiZero;
                nucleon->setType(ParticleTable::getNucleonType(-iso/2));
            }
            else{
                Pion1Type = ParticleTable::getPionType(iso);
                Pion2Type = ParticleTable::getPionType(iso);
                kaon->setType(ParticleTable::getKaonType(-iso/2));
                nucleon->setType(ParticleTable::getNucleonType(-iso/2));
            }
        }
        else{
            if(rdm*25. < 8.){
                Pion1Type = PiPlus;
                Pion2Type = PiMinus;
            }
            else if(rdm*25. < 9.){
                Pion1Type = PiZero;
                Pion2Type = PiZero;
            }
            else if(rdm*25. < 17.){
                Pion1Type = ParticleTable::getPionType(-2*iso_n);
                Pion2Type = PiZero;
                kaon->setType(ParticleTable::getKaonType(iso_n));
            }
            else if(rdm*25. < 19.){
                Pion1Type = PiPlus;
                Pion2Type = PiMinus;
                kaon->setType(ParticleTable::getKaonType(iso_n));
                nucleon->setType(ParticleTable::getNucleonType(-iso_n));
            }
            else if(rdm*25. < 21.){
                Pion1Type = PiZero;
                Pion2Type = PiZero;
                kaon->setType(ParticleTable::getKaonType(iso_n));
                nucleon->setType(ParticleTable::getNucleonType(-iso_n));
            }
            else{
                Pion1Type = ParticleTable::getPionType(2*iso_n);
                Pion2Type = PiZero;
                nucleon->setType(ParticleTable::getNucleonType(-iso_n));
            }
        }
        
        ParticleList list;
        list.push_back(nucleon);
        list.push_back(kaon);
        const ThreeVector &rcol1 = nucleon->getPosition();
        const ThreeVector &rcol2 = kaon->getPosition();
        const ThreeVector zero;
        Particle *pion1 = new Particle(Pion1Type,zero,rcol1);
        Particle *pion2 = new Particle(Pion2Type,zero,rcol2);
        list.push_back(pion1);
        list.push_back(pion2);
        
        PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);
        
        fs->addModifiedParticle(nucleon);
        fs->addModifiedParticle(kaon);
        fs->addCreatedParticle(pion1);
        fs->addCreatedParticle(pion2);
        
    }
}