G4INCLNpiToLK2piChannel.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 "G4INCLNpiToLK2piChannel.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 NpiToLK2piChannel::angularSlope = 6.; // What is the exact effect? Sould be check
    
    NpiToLK2piChannel::NpiToLK2piChannel(Particle *p1, Particle *p2)
        : particle1(p1), particle2(p2)
        {}
    
    NpiToLK2piChannel::~NpiToLK2piChannel(){}
    
    void NpiToLK2piChannel::fillFinalState(FinalState *fs) {
        
        // p pi+ -> L K+ pi+ pi0 (1)
        // p pi+ -> L K0 pi+ pi+ (1)
        //
        // p pi0 -> L K+ pi0 pi0 (1/4)
        // p pi0 -> L K+ pi+ pi- (1)
        // p pi0 -> L K0 pi+ pi0 (1/2)
        //
        // p pi- -> L K+ pi0 pi- (1)
        // p pi- -> L K0 pi+ pi- (1)
        // p pi- -> L K0 pi0 pi0 (1/2)
        
        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;
        ParticleType PionType;
        
        if(iso == 3 || iso == -3){
            if(rdm < 0.5){
                KaonType = ParticleTable::getKaonType(iso/3);
                PionType = PiZero;
            }
            else{
                KaonType = ParticleTable::getKaonType(-iso/3);
                PionType = ParticleTable::getPionType(2*iso/3);
            }
        }
        else if(pion->getType() == PiZero){
            if(rdm*7. < 1.){
                KaonType = ParticleTable::getKaonType(iso);
                PionType = PiZero;
            }
            else if(rdm*7. < 5.){
                KaonType = ParticleTable::getKaonType(iso);
                pion->setType(PiPlus);
                PionType = PiMinus;
            }
            else{
                KaonType = ParticleTable::getKaonType(-iso);
                PionType = ParticleTable::getPionType(2*iso);
            }
        }
        else{
            if(rdm*5. < 2.){
                KaonType = ParticleTable::getKaonType(-iso);
                PionType = PiZero;
            }
            else if(rdm*5. < 4.){
                KaonType = ParticleTable::getKaonType(iso);
                PionType = ParticleTable::getPionType(-2*iso);;
            }
            else{
                KaonType = ParticleTable::getKaonType(iso);
                pion->setType(PiZero);
                PionType = PiZero;
            }
        }
        
        nucleon->setType(Lambda);
 
#ifdef INCLXX_IN_GEANT4_MODE
        // Erase the parent resonance information of the nucleon and pion
        nucleon->setParentResonancePDGCode(0);
        nucleon->setParentResonanceID(0);
        pion->setParentResonancePDGCode(0);
        pion->setParentResonanceID(0);
#endif      
        
        ParticleList list;
        list.push_back(nucleon);
        list.push_back(pion);
        const ThreeVector &rcol1 = nucleon->getPosition();
        const ThreeVector &rcol2 = pion->getPosition();
        const ThreeVector zero;
        Particle *kaon = new Particle(KaonType,zero,rcol1);
        Particle *pion2 = new Particle(PionType,zero,rcol2);
        list.push_back(kaon);
        list.push_back(pion2);
        
        PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);
        
        INCL_DEBUG("NpiToLK2pi " << (kaon->getMomentum().theta()) * 180. / G4INCL::Math::pi << '\n');
        
        fs->addModifiedParticle(nucleon);
        fs->addModifiedParticle(pion);
        fs->addCreatedParticle(kaon);
        fs->addCreatedParticle(pion2);
        
    }
}