G4INCLNpiToMissingStrangenessChannel.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 "G4INCLNpiToMissingStrangenessChannel.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 NpiToMissingStrangenessChannel::angularSlope = 1.;
    
    NpiToMissingStrangenessChannel::NpiToMissingStrangenessChannel(Particle *p1, Particle *p2)
        : particle1(p1), particle2(p2)
        {}
    
    NpiToMissingStrangenessChannel::~NpiToMissingStrangenessChannel(){}
    
    void NpiToMissingStrangenessChannel::fillFinalState(FinalState *fs) {
        
        const G4double sqrtS = KinematicsUtils::totalEnergyInCM(particle1, particle2); // MeV       /!\/!\/!\.
// assert(sqrtS > 2.240); // ! > 2.109 Not supposed to be under 2.244 GeV.
        
        const G4int iso = ParticleTable::getIsospin(particle1->getType()) + ParticleTable::getIsospin(particle2->getType());
// assert(iso == -3 || iso == -1 || iso == 1 || iso == 3);
        G4int iso_system = 0;
        G4int available_iso = 0;
        G4int nbr_pions = 0;
        G4int min_pions = 0;
        G4int max_pions = 0;
        
        Particle *pion_initial;
        Particle *nucleon_initial;
        
        if(particle1->isPion()){
            pion_initial = particle1;
            nucleon_initial = particle2;
        }
        else{
            pion_initial = particle2;
            nucleon_initial = particle1;
        }
        const G4double pLab = 0.001*KinematicsUtils::momentumInLab(pion_initial, nucleon_initial); // GeV   /!\/!\/!\.
        
        G4double rdm = Random::shoot();
        
        G4int nbr_particle = 2;
        
        if(rdm < 0.35){
            // Lambda-K chosen
            nucleon_initial->setType(Lambda);
            available_iso = 1;
            min_pions = 3;
            max_pions = G4int((sqrtS-ParticleTable::getINCLMass(Lambda)-ParticleTable::getINCLMass(KZero)-10.)/ParticleTable::getINCLMass(PiPlus));
        }
        else if((iso == 0 && rdm < 0.55) || rdm < 0.5){
            // N-K-Kb chosen
            nbr_particle++;
            available_iso = 3;
            min_pions = 1;
            max_pions = G4int((sqrtS-ParticleTable::getINCLMass(Proton)-2.*ParticleTable::getINCLMass(KZero)-10.)/ParticleTable::getINCLMass(PiPlus));
        }
        else{
            // Sigma-K chosen
            available_iso = 3;
            min_pions = 3;
            max_pions = G4int((sqrtS-ParticleTable::getINCLMass(SigmaMinus)-ParticleTable::getINCLMass(KZero)-10.)/ParticleTable::getINCLMass(PiPlus));
        }
                                        // Gaussian noise  + mean value nbr pions fonction energy (choice)
        G4double intermediaire = min_pions + Random::gauss(2) + std::sqrt(pLab-2.2);
        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 = pion_initial->getPosition();
        const ThreeVector zero;
        
        //      (pip   piz   pim)   (sp    sz    sm)   (L    S    Kb)
        //pip_p  0.63  0.26  0.11   0.73  0.25  0.02   0.42 0.49 0.09 // inital
        //pip_p  0.54  0.26  0.20   0.73  0.25  0.02   0.42 0.49 0.09 // choice
        G4bool pip_p = (std::abs(iso) == 3);
        //piz_p  0.32  0.45  0.23   0.52  0.40  0.08   0.40 0.41 0.19
        G4bool piz_p = (ParticleTable::getIsospin(pion_initial->getType()) == 0);
        //pim_p  0.18  0.37  0.45   0.20  0.63  0.17   0.39 0.33 0.28
        G4bool pim_p = (!pip_p && !piz_p);
    
        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){
                rdm = Random::shoot();
                if((pip_p && rdm < 0.54) || (piz_p && rdm < 0.32) || (pim_p && rdm < 0.45)){
                    pion->setType(ParticleTable::getPionType(G4int(Math::sign(iso))*2)); //pip/pip/pim
                    iso_system += 2*G4int(Math::sign(iso));
                    available_iso -= 2;
                }
                else if((pip_p && rdm < 0.80) || (piz_p && rdm < 0.77) || (pim_p && rdm < 0.82)){
                    pion->setType(PiZero);
                    available_iso -= 2;
                }
                else{
                    pion->setType(ParticleTable::getPionType(-G4int(Math::sign(iso))*2));
                    iso_system -= 2*G4int(Math::sign(iso));
                    available_iso -= 2;
                }
            }
            else if(available_iso-std::abs(iso-iso_system) == 2){
                rdm = Random::shoot();
                if((pip_p && rdm < 0.26/0.37 && (Math::sign(iso)*Math::sign(iso-iso_system)+1)) || (pip_p && rdm < 0.26/0.89 && (Math::sign(iso)*Math::sign(iso-iso_system)-1)) ||
                   (piz_p && rdm < 0.45/0.68 && (Math::sign(iso)*Math::sign(iso-iso_system)+1)) || (piz_p && rdm < 0.45/0.77 && (Math::sign(iso)*Math::sign(iso-iso_system)-1)) ||
                   (pim_p && rdm < 0.37/0.82 && (Math::sign(iso)*Math::sign(iso-iso_system)+1)) || (piz_p && rdm < 0.37/0.55 && (Math::sign(iso)*Math::sign(iso-iso_system)-1))){
                    pion->setType(PiZero);
                    available_iso -= 2;
                }
                else{
                    pion->setType(ParticleTable::getPionType(Math::sign(iso-iso_system)*2));
                    iso_system += Math::sign(iso-iso_system)*2;
                    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 NpiToMissingStrangenessChannel" << '\n');
            list.push_back(pion);
        }
        
        if(nucleon_initial->isLambda()){ // K-Lambda
// assert(available_iso == 1);
            pion_initial->setType(ParticleTable::getKaonType(iso-iso_system));
        }
        else if(min_pions == 1){ // N-K-Kb chosen
// assert(available_iso == 3);
            Particle *antikaon = new Particle(KMinus,zero,rcol1);
            if(std::abs(iso-iso_system) == 3){
                pion_initial->setType(ParticleTable::getKaonType((iso-iso_system)/3));
                nucleon_initial->setType(ParticleTable::getNucleonType((iso-iso_system)/3));
                antikaon->setType(ParticleTable::getAntiKaonType((iso-iso_system)/3));
            }
            else if(std::abs(iso-iso_system) == 1){ // equi-repartition
                rdm = G4int(Random::shoot()*3.)-1;
                nucleon_initial->setType(ParticleTable::getNucleonType((G4int(rdm+0.5)*2-1)*(iso_system-iso)));
                pion_initial->setType(ParticleTable::getKaonType((std::abs(rdm*2)-1)*(iso-iso_system)));
                antikaon->setType(ParticleTable::getAntiKaonType((G4int(rdm-0.5)*2+1)*(iso-iso_system)));
            }
            else INCL_ERROR("Isospin non-conservation in NNToMissingStrangenessChannel" << '\n');
            list.push_back(antikaon);
            nbr_pions += 1; // need for addCreatedParticle loop
        }
        else{// Sigma-K
// assert(available_iso == 3);
            if(std::abs(iso-iso_system) == 3){
                pion_initial->setType(ParticleTable::getKaonType((iso-iso_system)/3));
                nucleon_initial->setType(ParticleTable::getSigmaType((iso-iso_system)*2/3));
            }
            else if(std::abs(iso-iso_system) == 1){
                rdm = Random::shoot();
                if((pip_p && rdm < 0.73) || (piz_p && rdm < 0.32) || (pim_p && rdm < 0.45)){
                    nucleon_initial->setType(SigmaZero);
                    pion_initial->setType(ParticleTable::getKaonType(iso-iso_system));
                }
                else{
                    nucleon_initial->setType(ParticleTable::getSigmaType((iso-iso_system)*2));
                    pion_initial->setType(ParticleTable::getKaonType(iso_system-iso));
                }
            }
            else INCL_ERROR("Isospin non-conservation in NNToMissingStrangenessChannel" << '\n');
        }
        
        list.push_back(pion_initial);
        list.push_back(nucleon_initial);
        
        PhaseSpaceGenerator::generateBiased(sqrtS, list, list.size()-1, angularSlope);
        
        fs->addModifiedParticle(pion_initial);
        fs->addModifiedParticle(nucleon_initial);
        for(Int_t i=0; i<nbr_pions; i++) fs->addCreatedParticle(list[i]);
        
    }
}