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);
 
        // Erase the parent resonance information of the nucleon and pion
        nucleon->setParentResonancePDGCode(0);
        nucleon->setParentResonanceID(0);
        pion->setParentResonancePDGCode(0);
        pion->setParentResonanceID(0);
 
        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);
        
    }
}