G4INCLNNToMissingStrangenessChannel.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 "G4INCLNNToMissingStrangenessChannel.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 NNToMissingStrangenessChannel::angularSlope = 1.;
    
    NNToMissingStrangenessChannel::NNToMissingStrangenessChannel(Particle *p1, Particle *p2)
        : particle1(p1), particle2(p2)
        {}
    
    NNToMissingStrangenessChannel::~NNToMissingStrangenessChannel(){}
    
    void NNToMissingStrangenessChannel::fillFinalState(FinalState *fs) {
        
        const G4double sqrtS = KinematicsUtils::totalEnergyInCM(particle1, particle2); // MeV
        const G4double pLab = 0.001*KinematicsUtils::momentumInLab(particle1, particle2); // GeV
// assert(sqrtS > 3100); // ! > 3047.34. Not supposed to be under 3,626 GeV.
        
        const G4int iso = ParticleTable::getIsospin(particle1->getType()) + ParticleTable::getIsospin(particle2->getType());
// assert(iso == -2 || iso == 0 || iso == 2);
        G4int iso_system = 0;
        G4int available_iso = 0;
        G4int nbr_pions = 0;
        G4int min_pions = 0;
        G4int max_pions = 0;
        
        G4double rdm = Random::shoot();
        
        G4int nbr_particle = 3;
        
        if(rdm < 0.35){
            // N-K-Lambda chosen
            particle2->setType(Lambda);
            available_iso = 2;
            min_pions = 3;
            max_pions = G4int((sqrtS-ParticleTable::getINCLMass(Lambda)-ParticleTable::getINCLMass(Proton)-ParticleTable::getINCLMass(KZero))/ParticleTable::getINCLMass(PiPlus));
        }
        else if((iso == 0 && rdm < 0.55) || rdm < 0.5){
            // N-N-K-Kb chosen
            nbr_particle++;
            available_iso = 4;
            min_pions = 1;
            max_pions = G4int((sqrtS-2.*ParticleTable::getINCLMass(Proton)-2.*ParticleTable::getINCLMass(KZero))/ParticleTable::getINCLMass(PiPlus));
        }
        else{
            // N-K-Sigma chosen
            available_iso = 4;
            min_pions = 3;
            max_pions = G4int((sqrtS-ParticleTable::getINCLMass(SigmaMinus)-ParticleTable::getINCLMass(Proton)-ParticleTable::getINCLMass(KZero))/ParticleTable::getINCLMass(PiPlus));
        }
                                        /* Gaussian noise  + mean value nbr pions fonction energy (choice)*/
        G4double intermediaire = min_pions + Random::gauss(2) + std::sqrt(pLab-5);
        nbr_pions = std::min(max_pions,std::max(min_pions,G4int(intermediaire )));
        
        available_iso += nbr_pions*2;
        nbr_particle += nbr_pions;
        
        ParticleList list;
        ParticleType PionType = PiZero;
        const ThreeVector &rcol1 = particle1->getPosition();
        const ThreeVector zero;
        Particle *kaon = new Particle(KPlus,zero,rcol1);
        
        for(Int_t i=0; i<nbr_pions; i++){
            Particle *pion = new Particle(PionType,zero,rcol1);
            if(available_iso-std::abs(iso-iso_system) >= 4){ // pp(pn) pip:0.40(0.3) piz:0.35(0.4) pim:0.25(0.3)
                rdm = Random::shoot();
                if(((iso == 0) && rdm < 0.3) || ((iso == -2) && rdm < 0.40) || rdm < 0.25){
                    pion->setType(PiMinus);
                    iso_system -= 2;
                    available_iso -= 2;
                }
                else if(((iso == 0) && rdm < 0.7) || ((iso == -2) && rdm < 0.75) || rdm < 0.60){
                    pion->setType(PiZero);
                    available_iso -= 2;
                }
                else{
                    pion->setType(PiPlus);
                    iso_system += 2;
                    available_iso -= 2;
                }
            }
            else if(available_iso-std::abs(iso-iso_system) == 2){
                rdm = Random::shoot();
                //              pn                          pp too high (nn too low) -> PiMinus(PiPlus)                                 pp too low (nn too high) -> PiPlus(PiMinus)
                if(((iso == 0) && (rdm*0.7 < 0.3)) || ((rdm*0.60 < 0.25) && (Math::sign(iso-iso_system)*2-iso != 0)) || ((rdm*0.75 < 0.40) && (Math::sign(iso-iso_system)*2+iso != 0) && (iso != 0))){
                    pion->setType(ParticleTable::getPionType(Math::sign(iso-iso_system)*2));
                    iso_system += Math::sign(iso-iso_system)*2;
                    available_iso -= 2;
                }
                else{
                    PionType = PiZero;
                    available_iso -= 2;
                }
            }
            else if(available_iso-std::abs(iso-iso_system) == 0){
                pion->setType(ParticleTable::getPionType(Math::sign(iso-iso_system)*2));
                iso_system += Math::sign(iso-iso_system)*2;
                available_iso -= 2;
            }
            else INCL_ERROR("Pion Generation Problem in NNToMissingStrangenessChannel" << '\n');
            list.push_back(pion);
        }
        
        if(particle2->isLambda()){ // N-K-Lambda
// assert(available_iso == 2);
            if(std::abs(iso-iso_system) == 2){
                particle1->setType(ParticleTable::getNucleonType((iso-iso_system)/2));
                kaon->setType(ParticleTable::getKaonType((iso-iso_system)/2));
            }
            else if(std::abs(iso-iso_system) == 0){
                rdm = G4int(Random::shoot()*2.)*2-1;
                particle1->setType(ParticleTable::getNucleonType(G4int(rdm)));
                kaon->setType(ParticleTable::getKaonType(G4int(-rdm)));
            }
            else INCL_ERROR("Isospin non-conservation in NNToMissingStrangenessChannel" << '\n');
        }
        else if(min_pions == 1){ // N-N-K-Kb chosen
// assert(available_iso == 4);
            Particle *antikaon = new Particle(KMinus,zero,rcol1);
            if(std::abs(iso-iso_system) == 4){
                particle1->setType(ParticleTable::getNucleonType((iso-iso_system)/4));
                particle2->setType(ParticleTable::getNucleonType((iso-iso_system)/4));
                kaon->setType(ParticleTable::getKaonType((iso-iso_system)/4));
                antikaon->setType(ParticleTable::getAntiKaonType((iso-iso_system)/4));
            }
            else if(std::abs(iso-iso_system) == 2){ // choice: kaon type free, nucleon type fixed
                rdm = G4int(Random::shoot()*2.)*2-1;
                particle1->setType(ParticleTable::getNucleonType((iso-iso_system)/2));
                particle2->setType(ParticleTable::getNucleonType((iso-iso_system)/2));
                kaon->setType(ParticleTable::getKaonType(G4int(rdm)));
                antikaon->setType(ParticleTable::getAntiKaonType(G4int(-rdm)));
            }
            else if(std::abs(iso-iso_system) == 0){ // particle1 3/4 proton, 1/4 neutron; particle2 1/4 proton, 3/4 neutron
                rdm = G4int(Random::shoot()*2.)*2-1;
                G4double rdm2 = G4int(Random::shoot()*2.)*2-1;
                particle1->setType(ParticleTable::getNucleonType(std::max(rdm,rdm2)));
                particle2->setType(ParticleTable::getNucleonType(std::min(rdm,rdm2)));
                kaon->setType(ParticleTable::getKaonType(-G4int(rdm)));
                antikaon->setType(ParticleTable::getAntiKaonType(-G4int(rdm2)));
            }
            else INCL_ERROR("Isospin non-conservation in NNToMissingStrangenessChannel" << '\n');
            list.push_back(antikaon);
            nbr_pions += 1; // need for addCreatedParticle loop
        }
        else{// N-K-Sigma
// assert(available_iso == 4);
            if(std::abs(iso-iso_system) == 4){
                particle1->setType(ParticleTable::getNucleonType((iso-iso_system)/4));
                particle2->setType(ParticleTable::getSigmaType((iso-iso_system)/2));
                kaon->setType(ParticleTable::getKaonType((iso-iso_system)/4));
            }
            else if(std::abs(iso-iso_system) == 2){ // choice: sigma quasi-free, kaon type semi-free, nucleon type fixed
                rdm = Random::shoot();
                // pp(pn) sp:0.42(0.23) sz:0.51(0.54) sm:0.07(0.23)
                if(((iso == 0) && (rdm*0.77 < 0.23)) || ((rdm*0.58 < 0.07) && (Math::sign(iso-iso_system)*2-iso != 0)) || ((rdm*0.93 < 0.42) && (Math::sign(iso-iso_system)*2+iso != 0) && (iso != 0))){
                    particle2->setType(ParticleTable::getSigmaType(Math::sign(iso-iso_system)*2));
                    rdm = G4int(Random::shoot()*2.)*2-1;
                    particle1->setType(ParticleTable::getNucleonType(G4int(rdm)));
                    kaon->setType(ParticleTable::getKaonType(-G4int(rdm)));
                }
                else{
                    particle2->setType(SigmaZero);
                    particle1->setType(ParticleTable::getNucleonType((iso-iso_system)/2));
                    kaon->setType(ParticleTable::getKaonType((iso-iso_system)/2));
                }
            }
            else if(std::abs(iso-iso_system) == 0){ // choice: sigma free, kaontype semi-free, nucleon type fixed
                if(((iso == 0) && rdm < 0.23) || ((iso == 2) && rdm < 0.42) || rdm < 0.07){
                    particle2->setType(SigmaPlus);
                    particle1->setType(Neutron);
                    kaon->setType(KZero);
                }
                else if(((iso == 0) && rdm < 0.77) || ((iso == 2) && rdm < 0.93) || rdm < 0.58){
                    particle2->setType(SigmaZero);
                    rdm = G4int(Random::shoot()*2.)*2-1;
                    particle1->setType(ParticleTable::getNucleonType(G4int(rdm)));
                    kaon->setType(ParticleTable::getKaonType(-G4int(rdm)));
                }
                else{
                    particle2->setType(SigmaMinus);
                    particle1->setType(Proton);
                    kaon->setType(KPlus);
                }
            }
            else INCL_ERROR("Isospin non-conservation in NNToMissingStrangenessChannel" << '\n');
        }
        
        list.push_back(particle1);
        list.push_back(particle2);
        list.push_back(kaon);
        
        PhaseSpaceGenerator::generateBiased(sqrtS, list, list.size()-3, angularSlope);
        
        fs->addModifiedParticle(particle1);
        fs->addModifiedParticle(particle2);
        fs->addCreatedParticle(kaon);
        for(Int_t i=0; i<nbr_pions; i++) fs->addCreatedParticle(list[i]);
        
    }
}