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);
        
    }
}