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Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // 00028 // ------------------------------------------------------------ 00029 // GEANT 4 class implementation file 00030 // 00031 // ---------------- G4Parton ---------------- 00032 // by Gunter Folger, June 1998. 00033 // class for Parton (inside a string) used by Parton String Models 00034 // ------------------------------------------------------------ 00035 00036 #include "G4Parton.hh" 00037 #include "G4HadronicException.hh" 00038 00039 G4Parton::G4Parton(G4int PDGcode) 00040 { 00041 PDGencoding=PDGcode; 00042 theX = 0; 00043 theDefinition=G4ParticleTable::GetParticleTable()->FindParticle(PDGencoding); 00044 if (theDefinition == NULL) 00045 { 00046 G4cout << "Encoding = "<<PDGencoding<<G4endl; 00047 G4String text = "G4Parton::GetDefinition(): Encoding not in particle table"; 00048 throw G4HadronicException(__FILE__, __LINE__, text); 00049 } 00050 // 00051 // colour by random in (1,2,3)=(R,G,B) for quarks and 00052 // in (-1,-2,-3)=(Rbar,Gbar,Bbar) for anti-quarks: 00053 // 00054 if (theDefinition->GetParticleType() == "quarks") { 00055 theColour = ((G4int)(3.*G4UniformRand())+1)*(std::abs(PDGencoding)/PDGencoding) ; 00056 } 00057 // 00058 // colour by random in (-1,-2,-3)=(Rbar,Gbar,Bbar)=(GB,RB,RG) for di-quarks and 00059 // in (1,2,3)=(R,G,B)=(GB,RB,RG) for anti-di-quarks: 00060 // 00061 else if (theDefinition->GetParticleType() == "diquarks") { 00062 theColour = -((G4int)(3.*G4UniformRand())+1)*(std::abs(PDGencoding)/PDGencoding); 00063 } 00064 // 00065 // colour by random in (-11,-12,...,-33)=(RRbar,RGbar,RBbar,...,BBbar) for gluons: 00066 // 00067 else if (theDefinition->GetParticleType() == "gluons") { 00068 theColour = -(((G4int)(3.*G4UniformRand())+1)*10 + ((G4int)(3.*G4UniformRand())+1)); 00069 } 00070 else { 00071 G4cout << "Encoding = "<<PDGencoding<<G4endl; 00072 G4String text = "G4Parton::GetDefinition(): Particle is not a parton"; 00073 throw G4HadronicException(__FILE__, __LINE__, text); 00074 } 00075 // 00076 // isospin-z from PDG-encoded isospin-z for 00077 // quarks, anti-quarks, di-quarks, and anti-di-quarks: 00078 // 00079 if ((theDefinition->GetParticleType() == "quarks") || (theDefinition->GetParticleType() == "diquarks")){ 00080 theIsoSpinZ = theDefinition->GetPDGIsospin3(); 00081 } 00082 // 00083 // isospin-z choosen at random from PDG-encoded isospin for gluons (should be zero): 00084 // 00085 else { 00086 G4int thisPDGiIsospin=theDefinition->GetPDGiIsospin(); 00087 if (thisPDGiIsospin == 0) { 00088 theIsoSpinZ = 0; 00089 } 00090 else { 00091 theIsoSpinZ = ((G4int)((thisPDGiIsospin+1)*G4UniformRand()))-thisPDGiIsospin*0.5; 00092 } 00093 } 00094 // 00095 // spin-z choosen at random from PDG-encoded spin: 00096 // 00097 G4int thisPDGiSpin=theDefinition->GetPDGiSpin(); 00098 if (thisPDGiSpin == 0) { 00099 theSpinZ = 0; 00100 } 00101 else { 00102 G4int rand=((G4int)((thisPDGiSpin+1)*G4UniformRand())); 00103 theSpinZ = rand-thisPDGiSpin*0.5;; 00104 } 00105 } 00106 00107 G4Parton::G4Parton(const G4Parton &right) 00108 { 00109 PDGencoding = right.PDGencoding; 00110 theMomentum = right.theMomentum; 00111 thePosition = right.thePosition; 00112 theX = right.theX; 00113 theDefinition = right.theDefinition; 00114 theColour = right.theColour; 00115 theIsoSpinZ = right.theIsoSpinZ; 00116 theSpinZ = right.theSpinZ; 00117 } 00118 00119 G4Parton & G4Parton::operator=(const G4Parton &right) 00120 { 00121 if (this != &right) 00122 { 00123 PDGencoding=right.GetPDGcode(); 00124 theMomentum=right.Get4Momentum(); 00125 thePosition=right.GetPosition(); 00126 theX = right.theX; 00127 theDefinition = right.theDefinition; 00128 theColour = right.theColour; 00129 theIsoSpinZ = right.theIsoSpinZ; 00130 theSpinZ = right.theSpinZ; 00131 } 00132 00133 return *this; 00134 } 00135 00136 G4Parton::~G4Parton() 00137 { 00138 // cout << "G4Parton::~G4Parton(): this = "<<this <<endl; 00139 // cout << "break here"<<this <<endl; 00140 } 00141 00142 void G4Parton::DefineMomentumInZ(G4double aLightConeMomentum, G4bool aDirection) 00143 { 00144 G4double Mass = GetMass(); 00145 G4LorentzVector a4Momentum = Get4Momentum(); 00146 aLightConeMomentum*=theX; 00147 G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass); 00148 a4Momentum.setPz(0.5*(aLightConeMomentum - TransverseMass2/aLightConeMomentum)*(aDirection? 1: -1)); 00149 a4Momentum.setE( 0.5*(aLightConeMomentum + TransverseMass2/aLightConeMomentum)); 00150 Set4Momentum(a4Momentum); 00151 } 00152 00153 void G4Parton::DefineMomentumInZ(G4double aLightConeMomentum,G4double aLightConeE, G4bool aDirection) 00154 { 00155 G4double Mass = GetMass(); 00156 G4LorentzVector a4Momentum = Get4Momentum(); 00157 aLightConeMomentum*=theX; 00158 aLightConeE*=theX; 00159 G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass); 00160 a4Momentum.setPz(0.5*(aLightConeMomentum - aLightConeE - TransverseMass2/aLightConeMomentum)*(aDirection? 1: -1)); 00161 a4Momentum.setE( 0.5*(aLightConeMomentum + aLightConeE + TransverseMass2/aLightConeMomentum)); 00162 Set4Momentum(a4Momentum); 00163 }