[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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| 27 | // |
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| 28 | // ------------------------------------------------------------ |
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| 29 | // GEANT 4 class implementation file |
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| 30 | // |
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| 31 | // ---------------- G4Parton ---------------- |
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| 32 | // by Gunter Folger, June 1998. |
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| 33 | // class for Parton (inside a string) used by Parton String Models |
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| 34 | // ------------------------------------------------------------ |
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| 35 | |
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| 36 | #include "G4Parton.hh" |
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| 37 | #include "G4HadronicException.hh" |
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| 38 | |
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| 39 | G4Parton::G4Parton(G4int PDGcode) |
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| 40 | { |
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| 41 | PDGencoding=PDGcode; |
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| 42 | theX = 0; |
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| 43 | theDefinition=G4ParticleTable::GetParticleTable()->FindParticle(PDGencoding); |
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| 44 | if (theDefinition == NULL) |
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| 45 | { |
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| 46 | G4cout << "Encoding = "<<PDGencoding<<G4endl; |
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| 47 | G4String text = "G4Parton::GetDefinition(): Encoding not in particle table"; |
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| 48 | throw G4HadronicException(__FILE__, __LINE__, text); |
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| 49 | } |
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| 50 | // |
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| 51 | // colour by random in (1,2,3)=(R,G,B) for quarks and |
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| 52 | // in (-1,-2,-3)=(Rbar,Gbar,Bbar) for anti-quarks: |
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| 53 | // |
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| 54 | if (theDefinition->GetParticleType() == "quarks") { |
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| 55 | theColour = ((G4int)(3.*G4UniformRand())+1)*(std::abs(PDGencoding)/PDGencoding) ; |
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| 56 | } |
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| 57 | // |
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| 58 | // colour by random in (-1,-2,-3)=(Rbar,Gbar,Bbar)=(GB,RB,RG) for di-quarks and |
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| 59 | // in (1,2,3)=(R,G,B)=(GB,RB,RG) for anti-di-quarks: |
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| 60 | // |
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| 61 | else if (theDefinition->GetParticleType() == "diquarks") { |
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| 62 | theColour = -((G4int)(3.*G4UniformRand())+1)*(std::abs(PDGencoding)/PDGencoding); |
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| 63 | } |
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| 64 | // |
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| 65 | // colour by random in (-11,-12,...,-33)=(RRbar,RGbar,RBbar,...,BBbar) for gluons: |
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| 66 | // |
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| 67 | else if (theDefinition->GetParticleType() == "gluons") { |
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| 68 | theColour = -(((G4int)(3.*G4UniformRand())+1)*10 + ((G4int)(3.*G4UniformRand())+1)); |
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| 69 | } |
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| 70 | else { |
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| 71 | G4cout << "Encoding = "<<PDGencoding<<G4endl; |
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| 72 | G4String text = "G4Parton::GetDefinition(): Particle is not a parton"; |
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| 73 | throw G4HadronicException(__FILE__, __LINE__, text); |
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| 74 | } |
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| 75 | // |
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| 76 | // isospin-z from PDG-encoded isospin-z for |
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| 77 | // quarks, anti-quarks, di-quarks, and anti-di-quarks: |
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| 78 | // |
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| 79 | if ((theDefinition->GetParticleType() == "quarks") || (theDefinition->GetParticleType() == "diquarks")){ |
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| 80 | theIsoSpinZ = theDefinition->GetPDGIsospin3(); |
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| 81 | } |
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| 82 | // |
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| 83 | // isospin-z choosen at random from PDG-encoded isospin for gluons (should be zero): |
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| 84 | // |
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| 85 | else { |
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| 86 | G4int thisPDGiIsospin=theDefinition->GetPDGiIsospin(); |
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| 87 | if (thisPDGiIsospin == 0) { |
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| 88 | theIsoSpinZ = 0; |
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| 89 | } |
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| 90 | else { |
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| 91 | theIsoSpinZ = ((G4int)((thisPDGiIsospin+1)*G4UniformRand()))-thisPDGiIsospin*0.5; |
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| 92 | } |
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| 93 | } |
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| 94 | // |
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| 95 | // spin-z choosen at random from PDG-encoded spin: |
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| 96 | // |
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| 97 | G4int thisPDGiSpin=theDefinition->GetPDGiSpin(); |
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| 98 | if (thisPDGiSpin == 0) { |
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| 99 | theSpinZ = 0; |
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| 100 | } |
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| 101 | else { |
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| 102 | G4int rand=((G4int)((thisPDGiSpin+1)*G4UniformRand())); |
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| 103 | theSpinZ = rand-thisPDGiSpin*0.5;; |
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| 104 | } |
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| 105 | } |
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| 106 | |
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| 107 | G4Parton::G4Parton(const G4Parton &right) |
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| 108 | { |
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| 109 | PDGencoding = right.PDGencoding; |
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| 110 | theMomentum = right.theMomentum; |
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| 111 | thePosition = right.thePosition; |
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| 112 | theX = right.theX; |
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| 113 | theDefinition = right.theDefinition; |
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| 114 | theColour = right.theColour; |
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| 115 | theIsoSpinZ = right.theIsoSpinZ; |
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| 116 | theSpinZ = right.theSpinZ; |
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| 117 | } |
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| 118 | |
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| 119 | const G4Parton & G4Parton::operator=(const G4Parton &right) |
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| 120 | { |
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| 121 | PDGencoding=right.GetPDGcode(); |
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| 122 | theMomentum=right.Get4Momentum(); |
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| 123 | thePosition=right.GetPosition(); |
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| 124 | theX = right.theX; |
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| 125 | theDefinition = right.theDefinition; |
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| 126 | theColour = right.theColour; |
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| 127 | theIsoSpinZ = right.theIsoSpinZ; |
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| 128 | theSpinZ = right.theSpinZ; |
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| 129 | |
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| 130 | return *this; |
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| 131 | } |
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| 132 | |
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| 133 | G4Parton::~G4Parton() |
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| 134 | { |
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| 135 | // cout << "G4Parton::~G4Parton(): this = "<<this <<endl; |
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| 136 | // cout << "break here"<<this <<endl; |
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| 137 | } |
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| 138 | |
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| 139 | void G4Parton::DefineMomentumInZ(G4double aLightConeMomentum, G4bool aDirection) |
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| 140 | { |
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| 141 | G4double Mass = GetMass(); |
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| 142 | G4LorentzVector a4Momentum = Get4Momentum(); |
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| 143 | aLightConeMomentum*=theX; |
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| 144 | G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass); |
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| 145 | a4Momentum.setPz(0.5*(aLightConeMomentum - TransverseMass2/aLightConeMomentum)*(aDirection? 1: -1)); |
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| 146 | a4Momentum.setE( 0.5*(aLightConeMomentum + TransverseMass2/aLightConeMomentum)); |
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| 147 | Set4Momentum(a4Momentum); |
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| 148 | } |
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| 149 | |
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| 150 | void G4Parton::DefineMomentumInZ(G4double aLightConeMomentum,G4double aLightConeE, G4bool aDirection) |
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| 151 | { |
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| 152 | G4double Mass = GetMass(); |
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| 153 | G4LorentzVector a4Momentum = Get4Momentum(); |
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| 154 | aLightConeMomentum*=theX; |
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| 155 | aLightConeE*=theX; |
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| 156 | G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass); |
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| 157 | a4Momentum.setPz(0.5*(aLightConeMomentum - aLightConeE - TransverseMass2/aLightConeMomentum)*(aDirection? 1: -1)); |
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| 158 | a4Momentum.setE( 0.5*(aLightConeMomentum + aLightConeE + TransverseMass2/aLightConeMomentum)); |
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| 159 | Set4Momentum(a4Momentum); |
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| 160 | } |
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