G4INCLNDeltaToDeltaSKChannel.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 "G4INCLNDeltaToDeltaSKChannel.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 NDeltaToDeltaSKChannel::angularSlope = 2.;
  
  NDeltaToDeltaSKChannel::NDeltaToDeltaSKChannel(Particle *p1, Particle *p2)
    : particle1(p1), particle2(p2)
    {}
  
  NDeltaToDeltaSKChannel::~NDeltaToDeltaSKChannel(){}
  
  G4double NDeltaToDeltaSKChannel::sampleDeltaMass(G4double ecm) {
    const G4double maxDeltaMass = ecm - ParticleTable::effectiveSigmaMass - ParticleTable::effectiveKaonMass - 1.0;
    const G4double maxDeltaMassRndm = std::atan((maxDeltaMass-ParticleTable::effectiveDeltaMass)*2./ParticleTable::effectiveDeltaWidth); // atan((mass-1232)*2/130)
    const G4double deltaMassRndmRange = maxDeltaMassRndm - ParticleTable::minDeltaMassRndm; // atan
// assert(deltaMassRndmRange>0.);

    G4double y=ecm*ecm;
    G4double q2=(y-1.157776E6)*(y-6.4E5)/y/4.0; // 1.157776E6 = 1076^2 = (mNucleon + mPion)^2, 6.4E5 = 800^2 = (mNucleon - mPion)^2  // (prc56(1997)2431) (eq 3.7)^2
    G4double q3=std::pow(std::sqrt(q2), 3.);
    const G4double f3max=q3/(q3+5.832E6); // 5.832E6 = 180^3 = cut_parameter^3 // (prc56(1997)2431) (cf eq 3.6)
    G4double x;

    G4int nTries = 0;
    G4bool success = false;
    while(!success) { /* Loop checking, 10.07.2015, D.Mancusi */
      if(++nTries >= 100000) {
        INCL_WARN("NDeltaToDeltaSKChannel::sampleDeltaMass loop was stopped because maximum number of tries was reached. Minimum delta mass "
              << ParticleTable::minDeltaMass << " MeV with CM energy " << ecm << " MeV may be unphysical." << '\n');
        return ParticleTable::minDeltaMass;
      }
      
      G4double rndm = ParticleTable::minDeltaMassRndm + Random::shoot() * deltaMassRndmRange; // atan in order to avec a distribution in 1/(1+x^2)
      y = std::tan(rndm); // (mass-1232)*2/130
      x = ParticleTable::effectiveDeltaMass + 0.5*ParticleTable::effectiveDeltaWidth*y; // probability to have the mass M = 1/(1+(M-1232)^2)/Pi cut with min and max mass
// assert(x>=ParticleTable::minDeltaMass && ecm >= x + ParticleTable::effectiveSigmaMass + ParticleTable::effectiveKaonMass + 1.0);
      
      // generation of the delta mass with the penetration factor
      // (see prc56(1997)2431)
      y=x*x;
      q2=(y-1.157776E6)*(y-6.4E5)/y/4.0; // 1.157776E6 = 1076^2 = (mNucleon + mPion)^2, 6.4E5 = 800^2 = (mNucleon - mPion)^2  // (prc56(1997)2431) (eq 3.7)^2
      q3=std::pow(std::sqrt(q2), 3.);
      const G4double f3=q3/(q3+5.832E6); // 5.832E6 = 180^3 = cut_parameter^3 // (prc56(1997)2431) (eq 3.6)
      rndm = Random::shoot();
      if (rndm*f3max < f3) success = true; // promoting high masses
    }
    return x;
  }
  
  void NDeltaToDeltaSKChannel::fillFinalState(FinalState *fs) {
        //
        // D++ p -> S+ K+ D+  (2)
        // D++ p -> S0 K+ D++ (1)
        // D++ p -> S+ K0 D++ (6)
        //
        // D++ n -> S+ K+ D0  (2)
        // D++ n -> S0 K+ D+  (4)
        // D++ n -> S- K+ D++ (6)
        // D++ n -> S+ K0 D+  (2)
        // D++ n -> S0 K0 D++ (1)
        //
        // D+  p -> S+ K+ D0  (2)
        // D+  p -> S0 K+ D+  (1)
        // D+  p -> S- K+ D++ (2)
        // D+  p -> S+ K0 D+  (2)
        // D+  p -> S0 K0 D++ (4)
        //
        // D+  n -> S+ K+ D-  (2)
        // D+  n -> S0 K+ D0  (4)
        // D+  n -> S- K+ D+  (2)
        // D+  n -> S+ K0 D0  (2)
        // D+  n -> S0 K0 D+  (1)
        // D+  n -> S- K0 D++ (2)
        
        
        Particle *delta;
        
        if (particle1->isResonance()) {
            delta = particle1;
        }
        else {
            delta = particle2;
        }
    
    const G4double sqrtS = KinematicsUtils::totalEnergyInCM(particle1, particle2);
    
    const G4int iso = ParticleTable::getIsospin(particle1->getType()) + ParticleTable::getIsospin(particle2->getType());
    const G4int iso_d = ParticleTable::getIsospin(delta->getType());
    
    ParticleType KaonType;
    ParticleType DeltaType;
    ParticleType SigmaType;
    
    const G4double rdm = Random::shoot();
    
    if(std::abs(iso) == 4){// D++ p
      if(rdm*9 < 2){
        KaonType = ParticleTable::getKaonType(iso/4);
        DeltaType = ParticleTable::getDeltaType(iso/4);
        SigmaType = ParticleTable::getSigmaType(iso/2);
      }
      else if(rdm*9 < 3){
        KaonType = ParticleTable::getKaonType(iso/4);
        DeltaType = ParticleTable::getDeltaType(3*iso/4);
        SigmaType = SigmaZero;
      }
      else{
        KaonType = ParticleTable::getKaonType(-iso/4);
        DeltaType = ParticleTable::getDeltaType(3*iso/4);
        SigmaType = ParticleTable::getSigmaType(iso/2);
      }
    }
    else if(iso == 0){// D+  n
      if(rdm*13 < 2){
        KaonType = ParticleTable::getKaonType(iso_d);
        DeltaType = ParticleTable::getDeltaType(-3*iso_d);
        SigmaType = ParticleTable::getSigmaType(2*iso_d);
      }
      else if(rdm*13 < 6){
        KaonType = ParticleTable::getKaonType(iso_d);
        DeltaType = ParticleTable::getDeltaType(-iso_d);
        SigmaType = SigmaZero;
      }
      else if(rdm*13 < 8){
        KaonType = ParticleTable::getKaonType(iso_d);
        DeltaType = ParticleTable::getDeltaType(iso_d);
        SigmaType = ParticleTable::getSigmaType(-2*iso_d);
      }
      else if(rdm*13 < 10){
        KaonType = ParticleTable::getKaonType(-iso_d);
        DeltaType = ParticleTable::getDeltaType(-iso_d);
        SigmaType = ParticleTable::getSigmaType(2*iso_d);
      }
      else if(rdm*13 < 11){
        KaonType = ParticleTable::getKaonType(-iso_d);
        DeltaType = ParticleTable::getDeltaType(iso_d);
        SigmaType = SigmaZero;
      }
      else{
        KaonType = ParticleTable::getKaonType(-iso_d);
        DeltaType = ParticleTable::getDeltaType(3*iso_d);
        SigmaType = ParticleTable::getSigmaType(-2*iso_d);
      }
    }
    else if(ParticleTable::getIsospin(particle1->getType()) == ParticleTable::getIsospin(particle2->getType())){// D+  p
      if(rdm*11 < 2){
        KaonType = ParticleTable::getKaonType(iso/2);
        DeltaType = ParticleTable::getDeltaType(-iso/2);
        SigmaType = ParticleTable::getSigmaType(iso);
      }
      else if(rdm*11 < 3){
        KaonType = ParticleTable::getKaonType(iso/2);
        DeltaType = ParticleTable::getDeltaType(iso/2);
        SigmaType = SigmaZero;
      }
      else if(rdm*11 < 5){
        KaonType = ParticleTable::getKaonType(iso/2);
        DeltaType = ParticleTable::getDeltaType(3*iso/2);
        SigmaType = ParticleTable::getSigmaType(-iso);
      }
      else if(rdm*11 < 7){
        KaonType = ParticleTable::getKaonType(-iso/2);
        DeltaType = ParticleTable::getDeltaType(iso/2);
        SigmaType = ParticleTable::getSigmaType(iso);
      }
      else{
        KaonType = ParticleTable::getKaonType(-iso/2);
        DeltaType = ParticleTable::getDeltaType(3*iso/2);
        SigmaType = SigmaZero;
      }
    }
    else{// D++ n 
      if(rdm*15 < 2){
        KaonType = ParticleTable::getKaonType(iso/2);
        DeltaType = ParticleTable::getDeltaType(-iso/2);
        SigmaType = ParticleTable::getSigmaType(iso);
      }
      else if(rdm*15 < 6){
        KaonType = ParticleTable::getKaonType(iso/2);
        DeltaType = ParticleTable::getDeltaType(iso/2);
        SigmaType = SigmaZero;
      }
      else if(rdm*15 < 12){
        KaonType = ParticleTable::getKaonType(iso/2);
        DeltaType = ParticleTable::getDeltaType(3*iso/2);
        SigmaType = ParticleTable::getSigmaType(-iso);
      }
      else if(rdm*15 < 14){
        KaonType = ParticleTable::getKaonType(-iso/2);
        DeltaType = ParticleTable::getDeltaType(iso/2);
        SigmaType = ParticleTable::getSigmaType(iso);
      }
      else{
        KaonType = ParticleTable::getKaonType(-iso/2);
        DeltaType = ParticleTable::getDeltaType(3*iso/2);
        SigmaType = SigmaZero;
      }
    }
    
        
    particle1->setType(DeltaType);
    delta->setMass(sampleDeltaMass(sqrtS));
    particle2->setType(SigmaType);
    
    ParticleList list;
    list.push_back(particle1);
    list.push_back(particle2);
    const ThreeVector &rcol = particle2->getPosition();
    const ThreeVector zero;
    Particle *kaon = new Particle(KaonType,zero,rcol);
    list.push_back(kaon);
    
    PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);
    
    fs->addModifiedParticle(particle1);
    fs->addModifiedParticle(particle2);
    fs->addCreatedParticle(kaon);
    
  }
}