#include <G4INCLStrangeAbsorbtionChannel.hh>

Inheritance diagram for G4INCL::StrangeAbsorbtionChannel:

Public Member Functions
	StrangeAbsorbtionChannel (Particle , Particle )

virtual	~StrangeAbsorbtionChannel ()

void	fillFinalState (FinalState *fs)

Public Member Functions inherited from G4INCL::IChannel
	IChannel ()

virtual	~IChannel ()

FinalState *	getFinalState ()

Detailed Description

Definition at line 48 of file G4INCLStrangeAbsorbtionChannel.hh.

Constructor & Destructor Documentation

◆ StrangeAbsorbtionChannel()

G4INCL::StrangeAbsorbtionChannel::StrangeAbsorbtionChannel	(	Particle *	p1,
		Particle *	p2 )

Definition at line 47 of file G4INCLStrangeAbsorbtionChannel.cc.

    : particle1(p1), particle2(p2)
  {
 
  }

◆ ~StrangeAbsorbtionChannel()

G4INCL::StrangeAbsorbtionChannel::~StrangeAbsorbtionChannel ( )

virtual

Definition at line 53 of file G4INCLStrangeAbsorbtionChannel.cc.

53{}

Member Function Documentation

◆ fillFinalState()

void G4INCL::StrangeAbsorbtionChannel::fillFinalState ( FinalState * fs )

virtual

Implements G4INCL::IChannel.

Definition at line 62 of file G4INCLStrangeAbsorbtionChannel.cc.

                                                              {
    Particle * nucleon;
    Particle * strange;
    
    ThreeVector const incidentDirection = particle1->getMomentum() + particle2->getMomentum();
    
    if(particle1->isNucleon()) {
      nucleon = particle1;
      strange = particle2;
    } else {
      nucleon = particle2;
      strange = particle1;
    }
// assert(strange->isSigma() || strange->isAntiKaon());
 
    ParticleType finalType = Neutron;
    if(ParticleConfig::isPair(nucleon, strange, Neutron, KZeroBar)) {
      finalType = PiZero;
    } else if(ParticleConfig::isPair(nucleon, strange, Proton, KZeroBar)) {
      finalType = PiPlus;
    } else if(ParticleConfig::isPair(nucleon, strange, Neutron, KMinus)) {
      finalType = PiMinus;
    } else if(ParticleConfig::isPair(nucleon, strange, Proton, KMinus)) {
      finalType = PiZero;
    } else if(ParticleConfig::isPair(nucleon, strange, Proton, SigmaMinus)) {
      finalType = Neutron;
    } else if(ParticleConfig::isPair(nucleon, strange, Neutron, SigmaZero)) {
      finalType = Neutron;
    } else if(ParticleConfig::isPair(nucleon, strange, Proton, SigmaZero)) {
      finalType = Proton;
    } else if(ParticleConfig::isPair(nucleon, strange, Neutron, SigmaPlus)) {
      finalType = Proton;
    } else {
      INCL_ERROR("Unknown particle pair in Strange-N absorption: " << nucleon << '\t' << strange << '\n');
      return;
    }
 
    G4double energycm = KinematicsUtils::totalEnergyInCM(nucleon, strange);
    
    G4double finalTypemass = ParticleTable::getINCLMass(finalType);
    nucleon->setType(Lambda); // nucleon becomes the lambda
    G4double lambdamass = nucleon->getMass();
    
    G4double fi, ctet, stet;
    sampleAngles(&ctet, &stet, &fi);
    
    G4double cfi = std::cos(fi);
    G4double sfi = std::sin(fi);
    G4double beta = incidentDirection.mag();
    
    G4double q1, q2, q3;
    G4double sal=0.0;
    if (beta >= 1.0e-10)
        sal = incidentDirection.perp()/beta;
    if (sal >= 1.0e-6) {
        G4double b1 = incidentDirection.getX();
        G4double b2 = incidentDirection.getY();
        G4double b3 = incidentDirection.getZ();
        G4double cal = b3/beta;
        G4double t1 = ctet+cal*stet*sfi/sal;
        G4double t2 = stet/sal;
        q1=(b1*t1+b2*t2*cfi)/beta;
        q2=(b2*t1-b1*t2*cfi)/beta;
        q3=(b3*t1/beta-t2*sfi);
    } else {
        q1 = stet*cfi;
        q2 = stet*sfi;
        q3 = ctet;
    }
    
    G4double xq = KinematicsUtils::momentumInCM(energycm,
                                              lambdamass,
                                              finalTypemass);
    
    q1 *= xq;
    q2 *= xq;
    q3 *= xq;
    
    ThreeVector finalMomentum(q1, q2, q3);
    
    strange->setType(finalType);
    strange->setMomentum(finalMomentum);
    strange->adjustEnergyFromMomentum();
    nucleon->setMomentum(-finalMomentum);
    nucleon->adjustEnergyFromMomentum();
 
    fs->addModifiedParticle(nucleon); // nucleon became a lambda
    fs->addModifiedParticle(strange);  // the strange particle became an unstange particle
  }