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Gabriele Cosmo
2021-06-25 16:12:29 +02:00
parent c968e26a39
commit 6399a014b6
4200 changed files with 207479 additions and 237366 deletions
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source/processes/hadronic/util/src/G4Parton.cc
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//
// ********************************************************************
// * License and Disclaimer *
// * *
// * The Geant4 software is copyright of the Copyright Holders of *
// * the Geant4 Collaboration. It is provided under the terms and *
// * conditions of the Geant4 Software License, included in the file *
// * LICENSE and available at http://cern.ch/geant4/license . These *
// * include a list of copyright holders. *
// * *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work make any representation or warranty, express or implied, *
// * regarding this software system or assume any liability for its *
// * use. Please see the license in the file LICENSE and URL above *
// * for the full disclaimer and the limitation of liability. *
// * *
// * This code implementation is the result of the scientific and *
// * technical work of the GEANT4 collaboration. *
// * By using, copying, modifying or distributing the software (or *
// * any work based on the software) you agree to acknowledge its *
// * use in resulting scientific publications, and indicate your *
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
//
//
// ------------------------------------------------------------
// GEANT 4 class implementation file
//
// ---------------- G4Parton ----------------
// by Gunter Folger, June 1998.
// class for Parton (inside a string) used by Parton String Models
// ------------------------------------------------------------
#include "G4Parton.hh"
#include "G4HadronicException.hh"
G4Parton::G4Parton(G4int PDGcode)
{
PDGencoding=PDGcode;
theX = 0;
theDefinition=G4ParticleTable::GetParticleTable()->FindParticle(PDGencoding);
if (theDefinition == NULL)
{
G4cout << "Encoding = "<<PDGencoding<<G4endl;
G4String text = "G4Parton::GetDefinition(): Encoding not in particle table";
throw G4HadronicException(__FILE__, __LINE__, text);
}
//
// colour by random in (1,2,3)=(R,G,B) for quarks and
// in (-1,-2,-3)=(Rbar,Gbar,Bbar) for anti-quarks:
//
if (theDefinition->GetParticleType() == "quarks") {
theColour = ((G4int)(3.*G4UniformRand())+1)*(std::abs(PDGencoding)/PDGencoding) ;
}
//
// colour by random in (-1,-2,-3)=(Rbar,Gbar,Bbar)=(GB,RB,RG) for di-quarks and
// in (1,2,3)=(R,G,B)=(GB,RB,RG) for anti-di-quarks:
//
else if (theDefinition->GetParticleType() == "diquarks") {
theColour = -((G4int)(3.*G4UniformRand())+1)*(std::abs(PDGencoding)/PDGencoding);
}
//
// colour by random in (-11,-12,...,-33)=(RRbar,RGbar,RBbar,...,BBbar) for gluons:
//
else if (theDefinition->GetParticleType() == "gluons") {
theColour = -(((G4int)(3.*G4UniformRand())+1)*10 + ((G4int)(3.*G4UniformRand())+1));
}
else {
G4cout << "Encoding = "<<PDGencoding<<G4endl;
G4String text = "G4Parton::GetDefinition(): Particle is not a parton";
throw G4HadronicException(__FILE__, __LINE__, text);
}
//
// isospin-z from PDG-encoded isospin-z for
// quarks, anti-quarks, di-quarks, and anti-di-quarks:
//
if ((theDefinition->GetParticleType() == "quarks") || (theDefinition->GetParticleType() == "diquarks")){
theIsoSpinZ = theDefinition->GetPDGIsospin3();
}
//
// isospin-z choosen at random from PDG-encoded isospin for gluons (should be zero):
//
else {
G4int thisPDGiIsospin=theDefinition->GetPDGiIsospin();
if (thisPDGiIsospin == 0) {
theIsoSpinZ = 0;
}
else {
theIsoSpinZ = ((G4int)((thisPDGiIsospin+1)*G4UniformRand()))-thisPDGiIsospin*0.5;
}
}
//
// spin-z choosen at random from PDG-encoded spin:
//
G4int thisPDGiSpin=theDefinition->GetPDGiSpin();
if (thisPDGiSpin == 0) {
theSpinZ = 0;
}
else {
G4int rand=((G4int)((thisPDGiSpin+1)*G4UniformRand()));
theSpinZ = rand-thisPDGiSpin*0.5;;
}
}
G4Parton::G4Parton(const G4Parton &right)
{
PDGencoding = right.PDGencoding;
theMomentum = right.theMomentum;
thePosition = right.thePosition;
theX = right.theX;
theDefinition = right.theDefinition;
theColour = right.theColour;
theIsoSpinZ = right.theIsoSpinZ;
theSpinZ = right.theSpinZ;
}
G4Parton & G4Parton::operator=(const G4Parton &right)
{
if (this != &right)
{
PDGencoding=right.GetPDGcode();
theMomentum=right.Get4Momentum();
thePosition=right.GetPosition();
theX = right.theX;
theDefinition = right.theDefinition;
theColour = right.theColour;
theIsoSpinZ = right.theIsoSpinZ;
theSpinZ = right.theSpinZ;
}
return *this;
}
G4Parton::~G4Parton()
{
// cout << "G4Parton::~G4Parton(): this = "<<this <<endl;
// cout << "break here"<<this <<endl;
}
void G4Parton::DefineMomentumInZ(G4double aLightConeMomentum, G4bool aDirection)
{
G4double Mass = GetMass();
G4LorentzVector a4Momentum = Get4Momentum();
aLightConeMomentum*=theX;
G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass);
a4Momentum.setPz(0.5*(aLightConeMomentum - TransverseMass2/aLightConeMomentum)*(aDirection? 1: -1));
a4Momentum.setE( 0.5*(aLightConeMomentum + TransverseMass2/aLightConeMomentum));
Set4Momentum(a4Momentum);
}
void G4Parton::DefineMomentumInZ(G4double aLightConeMomentum,G4double aLightConeE, G4bool aDirection)
{
G4double Mass = GetMass();
G4LorentzVector a4Momentum = Get4Momentum();
aLightConeMomentum*=theX;
aLightConeE*=theX;
G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass);
a4Momentum.setPz(0.5*(aLightConeMomentum - aLightConeE - TransverseMass2/aLightConeMomentum)*(aDirection? 1: -1));
a4Momentum.setE( 0.5*(aLightConeMomentum + aLightConeE + TransverseMass2/aLightConeMomentum));
Set4Momentum(a4Momentum);
}