Import Geant4 6.0.0 source tree

2016-06-09 10:41:53 +02:00
parent 4aea781e80
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+//
+// ********************************************************************
+// * DISCLAIMER                                                       *
+// *                                                                  *
+// * The following disclaimer summarizes all the specific disclaimers *
+// * of contributors to this software. The specific disclaimers,which *
+// * govern, are listed with their locations in:                      *
+// *   http://cern.ch/geant4/license                                  *
+// *                                                                  *
+// * 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.                                                             *
+// *                                                                  *
+// * This  code  implementation is the  intellectual property  of the *
+// * GEANT4 collaboration.                                            *
+// * By copying,  distributing  or modifying the Program (or any work *
+// * based  on  the Program)  you indicate  your  acceptance of  this *
+// * statement, and all its terms.                                    *
+// ********************************************************************
+//
+//
+//
+// ------------------------------------------------------------
+//      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)*(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)*(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;
+}
+
+const G4Parton & G4Parton::operator=(const G4Parton &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);
+}