G4INCL::StrangeAbsorbtionChannel Class Reference

#include <G4INCLStrangeAbsorbtionChannel.hh>

Inheritance diagram for G4INCL::StrangeAbsorbtionChannel:

Public Member Functions
void	fillFinalState (FinalState *fs)
FinalState *	getFinalState ()
	StrangeAbsorbtionChannel (Particle *, Particle *)
virtual	~StrangeAbsorbtionChannel ()

Private Member Functions
	INCL_DECLARE_ALLOCATION_POOL (StrangeAbsorbtionChannel)
void	sampleAngles (G4double *, G4double *, G4double *)

Private Attributes
Particle *	particle1
Particle *	particle2

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.

{}

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
  }

References G4INCL::FinalState::addModifiedParticle(), G4INCL::Particle::adjustEnergyFromMomentum(), anonymous_namespace{G4PionRadiativeDecayChannel.cc}::beta, G4INCL::ParticleTable::getINCLMass(), G4INCL::Particle::getMomentum(), G4INCL::ThreeVector::getX(), G4INCL::ThreeVector::getY(), G4INCL::ThreeVector::getZ(), INCL_ERROR, G4INCL::Particle::isNucleon(), G4INCL::ParticleConfig::isPair(), G4INCL::KMinus, G4INCL::KZeroBar, G4INCL::Lambda, G4INCL::ThreeVector::mag(), G4INCL::KinematicsUtils::momentumInCM(), G4INCL::Neutron, G4InuclParticleNames::nucleon(), particle1, particle2, G4INCL::ThreeVector::perp(), G4INCL::PiMinus, G4INCL::PiPlus, G4INCL::PiZero, G4INCL::Proton, sampleAngles(), G4INCL::Particle::setMomentum(), G4INCL::Particle::setType(), G4INCL::SigmaMinus, G4INCL::SigmaPlus, G4INCL::SigmaZero, and G4INCL::KinematicsUtils::totalEnergyInCM().

getFinalState()

FinalState * G4INCL::IChannel::getFinalState ( )

inherited

Definition at line 50 of file G4INCLIChannel.cc.

                                      {
    FinalState *fs = new FinalState;
    fillFinalState(fs);
    return fs;
  }

References G4INCL::IChannel::fillFinalState().

INCL_DECLARE_ALLOCATION_POOL()

G4INCL::StrangeAbsorbtionChannel::INCL_DECLARE_ALLOCATION_POOL ( StrangeAbsorbtionChannel  )

private

sampleAngles()

void G4INCL::StrangeAbsorbtionChannel::sampleAngles ( G4double *  ctet_par, G4double *  stet_par, G4double *  phi_par  )

private

Definition at line 55 of file G4INCLStrangeAbsorbtionChannel.cc.

                                                                                                       {
      (*ctet_par) = -1.0 + 2.0*Random::shoot();
      if(std::abs(*ctet_par) > 1.0) (*ctet_par) = Math::sign(*ctet_par); // needed?
      (*stet_par) = std::sqrt(1.-(*ctet_par)*(*ctet_par));
      (*phi_par) = Math::twoPi * Random::shoot();
  }

References G4INCL::Random::shoot(), G4INCL::Math::sign(), and G4INCL::Math::twoPi.

Referenced by fillFinalState().

Field Documentation

particle1

Particle* G4INCL::StrangeAbsorbtionChannel::particle1

private

Definition at line 57 of file G4INCLStrangeAbsorbtionChannel.hh.

Referenced by fillFinalState().

particle2

Particle * G4INCL::StrangeAbsorbtionChannel::particle2

private

Definition at line 57 of file G4INCLStrangeAbsorbtionChannel.hh.

Referenced by fillFinalState().

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The documentation for this class was generated from the following files:

• source/processes/hadronic/models/inclxx/incl_physics/include/G4INCLStrangeAbsorbtionChannel.hh
• source/processes/hadronic/models/inclxx/incl_physics/src/G4INCLStrangeAbsorbtionChannel.cc