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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