1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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11 | // * Neither the authors of this software system, nor their employing * |
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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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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 | // $Id: G4XPDGElastic.cc,v 1.4 2010/03/12 15:45:18 gunter Exp $ // |
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28 | // ------------------------------------------------------------------- |
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29 | // |
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30 | // PDG Elastic cross section |
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31 | // PDG fits, Phys.Rev. D50 (1994), 1335 |
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32 | // |
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33 | // |
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34 | // ------------------------------------------------------------------- |
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35 | |
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36 | #include "globals.hh" |
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37 | #include "G4ios.hh" |
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38 | #include "G4XPDGElastic.hh" |
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39 | #include "G4KineticTrack.hh" |
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40 | #include "G4ParticleDefinition.hh" |
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41 | #include "G4DataVector.hh" |
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42 | |
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43 | #include "G4AntiProton.hh" |
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44 | #include "G4AntiNeutron.hh" |
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45 | #include "G4Proton.hh" |
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46 | #include "G4Neutron.hh" |
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47 | #include "G4PionPlus.hh" |
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48 | #include "G4PionMinus.hh" |
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49 | #include "G4KaonMinus.hh" |
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50 | #include "G4KaonPlus.hh" |
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51 | |
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52 | const G4double G4XPDGElastic::_lowLimit = 5. * GeV; |
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53 | const G4double G4XPDGElastic::_highLimit = DBL_MAX; |
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54 | |
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55 | // Parameters of the PDG Elastic cross-section fit (Rev. Particle Properties, 1998) |
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56 | // Columns are: lower and higher fit range, X, Y1, Y2 |
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57 | const G4int G4XPDGElastic::nPar = 7; |
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58 | // p pi+ |
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59 | const G4double G4XPDGElastic::pPiPlusPDGFit[7] = { 2., 200., 0., 11.4, -0.4, 0.079, 0. }; |
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60 | // p pi- |
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61 | const G4double G4XPDGElastic::pPiMinusPDGFit[7] = { 2., 360., 1.76, 11.2, -0.64, 0.043, 0. }; |
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62 | // p K+ |
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63 | const G4double G4XPDGElastic::pKPlusPDGFit[7] = { 2., 175., 5.0, 8.1, -1.8, 0.16, -1.3 }; |
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64 | // p K- |
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65 | const G4double G4XPDGElastic::pKMinusPDGFit[7] = { 2., 175., 7.3, 0., 0., 0.29, -2.40 }; |
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66 | // p p |
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67 | const G4double G4XPDGElastic::ppPDGFit[7] = { 2., 2100., 11.9, 26.9, -1.21, 0.169, -1.85 }; |
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68 | // p pbar |
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69 | const G4double G4XPDGElastic::ppbarPDGFit[7] = { 5., 1730000., 10.2, 52.7, -1.16, 0.125, -1.28 }; |
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70 | // n pbar |
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71 | const G4double G4XPDGElastic::npbarPDGFit[7] = { 1.1, 5.55, 36.5, 0., 0., 0., -11.9 }; |
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72 | |
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73 | |
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74 | G4XPDGElastic::G4XPDGElastic() |
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75 | { |
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76 | G4ParticleDefinition * proton = G4Proton::ProtonDefinition(); |
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77 | G4ParticleDefinition * neutron = G4Neutron::NeutronDefinition(); |
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78 | G4ParticleDefinition * piPlus = G4PionPlus::PionPlusDefinition(); |
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79 | G4ParticleDefinition * piMinus = G4PionMinus::PionMinusDefinition(); |
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80 | G4ParticleDefinition * KPlus = G4KaonPlus::KaonPlusDefinition(); |
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81 | G4ParticleDefinition * KMinus = G4KaonMinus::KaonMinusDefinition(); |
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82 | G4ParticleDefinition * antiproton = G4AntiProton::AntiProtonDefinition(); |
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83 | |
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84 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> pp(proton,proton); |
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85 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> pn(proton,neutron); |
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86 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> piPlusp(piPlus,proton); |
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87 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> piMinusp(piMinus,proton); |
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88 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> KPlusp(KPlus,proton); |
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89 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> KMinusp(KMinus,proton); |
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90 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> nn(neutron,neutron); |
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91 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> ppbar(proton,antiproton); |
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92 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> npbar(antiproton,neutron); |
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93 | |
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94 | std::vector<G4double> ppData; |
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95 | std::vector<G4double> pPiPlusData; |
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96 | std::vector<G4double> pPiMinusData; |
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97 | std::vector<G4double> pKPlusData; |
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98 | std::vector<G4double> pKMinusData; |
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99 | std::vector<G4double> ppbarData; |
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100 | std::vector<G4double> npbarData; |
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101 | |
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102 | G4int i; |
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103 | for (i=0; i<2; i++) |
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104 | { |
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105 | ppData.push_back(ppPDGFit[i] * GeV); |
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106 | pPiPlusData.push_back(pPiPlusPDGFit[i] * GeV); |
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107 | pPiMinusData.push_back(pPiMinusPDGFit[i] * GeV); |
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108 | pKPlusData.push_back(pKPlusPDGFit[i] * GeV); |
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109 | pKMinusData.push_back(pKMinusPDGFit[i] * GeV); |
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110 | ppbarData.push_back(ppbarPDGFit[i] * GeV); |
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111 | npbarData.push_back(npbarPDGFit[i] * GeV); |
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112 | } |
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113 | |
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114 | for (i=2; i<nPar; i++) |
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115 | { |
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116 | ppData.push_back(ppPDGFit[i]); |
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117 | pPiPlusData.push_back(pPiPlusPDGFit[i]); |
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118 | pPiMinusData.push_back(pPiMinusPDGFit[i]); |
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119 | pKPlusData.push_back(pKPlusPDGFit[i]); |
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120 | pKMinusData.push_back(pKMinusPDGFit[i]); |
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121 | ppbarData.push_back(ppbarPDGFit[i]); |
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122 | npbarData.push_back(npbarPDGFit[i]); |
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123 | } |
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124 | |
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125 | xMap[nn] = ppData; |
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126 | xMap[pp] = ppData; |
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127 | xMap[pn] = ppData; |
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128 | xMap[piPlusp] = pPiPlusData; |
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129 | xMap[piMinusp] = pPiMinusData; |
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130 | xMap[KPlusp] = pKPlusData; |
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131 | xMap[KMinusp] = pKMinusData; |
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132 | xMap[ppbar] = ppbarData; |
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133 | xMap[npbar] = npbarData; |
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134 | } |
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135 | |
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136 | |
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137 | G4XPDGElastic::~G4XPDGElastic() |
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138 | { } |
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139 | |
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140 | |
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141 | G4bool G4XPDGElastic::operator==(const G4XPDGElastic &right) const |
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142 | { |
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143 | return (this == (G4XPDGElastic *) &right); |
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144 | } |
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145 | |
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146 | |
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147 | G4bool G4XPDGElastic::operator!=(const G4XPDGElastic &right) const |
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148 | { |
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149 | return (this != (G4XPDGElastic *) &right); |
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150 | } |
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151 | |
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152 | |
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153 | G4double G4XPDGElastic::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const |
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154 | { |
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155 | // Elastic Cross-section fit, 1994 Review of Particle Properties, (1994), 1 |
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156 | |
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157 | G4double sigma = 0.; |
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158 | |
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159 | G4ParticleDefinition* def1 = trk1.GetDefinition(); |
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160 | G4ParticleDefinition* def2 = trk2.GetDefinition(); |
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161 | |
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162 | G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag(); |
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163 | G4double m1 = def1->GetPDGMass(); |
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164 | G4double m2 = def2->GetPDGMass(); |
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165 | G4double m = std::max(m1,m2); |
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166 | // if (m1 > m) m = m1; |
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167 | |
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168 | G4double pLab = 0.; |
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169 | |
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170 | if (m > 0. && sqrtS > (m1 + m2)) |
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171 | { |
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172 | pLab = std::sqrt( (sqrtS*sqrtS - (m1+m2)*(m1+m2) ) * (sqrtS*sqrtS - (m1-m2)*(m1-m2)) ) / (2*m); |
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173 | |
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174 | // The PDG fit formula requires p in GeV/c |
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175 | |
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176 | G4double enc1 = def1->GetPDGEncoding(); |
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177 | G4double enc2 = def2->GetPDGEncoding(); |
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178 | G4double coeff = -1.; |
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179 | if ( (enc1 < 0 && enc2 >0) || (enc2 < 0 && enc1 >0) ) coeff = 1.; |
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180 | |
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181 | // Order the pair: first is the lower mass particle, second is the higher mass one |
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182 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> trkPair(def1,def2); |
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183 | if (def1->GetPDGMass() > def2->GetPDGMass()) |
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184 | trkPair = std::pair<G4ParticleDefinition *,G4ParticleDefinition *>(def2,def1); |
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185 | |
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186 | std::vector<G4double> data; |
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187 | G4double pMinFit = 0.; |
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188 | G4double pMaxFit = 0.; |
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189 | G4double aFit = 0.; |
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190 | G4double bFit = 0.; |
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191 | G4double cFit = 0.; |
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192 | G4double dFit = 0.; |
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193 | G4double nFit = 0.; |
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194 | |
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195 | // Debug |
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196 | // G4cout << "Map has " << xMap.size() << " elements" << G4endl; |
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197 | // Debug end |
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198 | |
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199 | if (xMap.find(trkPair) != xMap.end()) |
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200 | { |
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201 | PairDoubleMap::const_iterator iter; |
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202 | for (iter = xMap.begin(); iter != xMap.end(); ++iter) |
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203 | { |
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204 | std::pair<G4ParticleDefinition *,G4ParticleDefinition *> thePair = (*iter).first; |
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205 | if (thePair == trkPair) |
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206 | { |
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207 | data = (*iter).second; |
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208 | pMinFit = data[0]; |
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209 | pMaxFit = data[1]; |
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210 | aFit = data[2]; |
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211 | bFit = data[3]; |
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212 | cFit = data[5]; |
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213 | dFit = data[6]; |
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214 | nFit = data[4]; |
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215 | |
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216 | if (pLab < pMinFit) return 0.0; |
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217 | if (pLab > pMaxFit ) |
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218 | G4cout << "WARNING! G4XPDGElastic::PDGElastic " |
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219 | << trk1.GetDefinition()->GetParticleName() << "-" |
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220 | << trk2.GetDefinition()->GetParticleName() |
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221 | << " elastic cross section: momentum " |
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222 | << pLab / GeV << " GeV outside valid fit range " |
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223 | << pMinFit /GeV << "-" << pMaxFit / GeV |
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224 | << G4endl; |
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225 | |
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226 | pLab /= GeV; |
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227 | if (pLab > 0.) |
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228 | { |
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229 | G4double logP = std::log(pLab); |
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230 | sigma = aFit + bFit * std::pow(pLab, nFit) + cFit * logP*logP + dFit * logP; |
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231 | sigma = sigma * millibarn; |
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232 | } |
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233 | } |
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234 | } |
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235 | } |
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236 | else |
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237 | { |
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238 | G4cout << "G4XPDGElastic::CrossSection - Data not found in Map" << G4endl; |
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239 | } |
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240 | } |
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241 | |
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242 | if (sigma < 0.) |
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243 | { |
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244 | G4cout << "WARNING! G4XPDGElastic::PDGElastic " |
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245 | << def1->GetParticleName() << "-" << def2->GetParticleName() |
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246 | << " elastic cross section: momentum " |
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247 | << pLab << " GeV, negative cross section " |
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248 | << sigma / millibarn << " mb set to 0" << G4endl; |
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249 | sigma = 0.; |
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250 | } |
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251 | |
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252 | return sigma; |
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253 | } |
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254 | |
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255 | |
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256 | G4String G4XPDGElastic::Name() const |
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257 | { |
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258 | G4String name = "PDGElastic "; |
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259 | return name; |
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260 | } |
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261 | |
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262 | |
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263 | G4bool G4XPDGElastic::IsValid(G4double e) const |
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264 | { |
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265 | G4bool answer = InLimits(e,_lowLimit,_highLimit); |
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266 | |
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267 | return answer; |
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268 | } |
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269 | |
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270 | |
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271 | |
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272 | |
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273 | |
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274 | |
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275 | |
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276 | |
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277 | |
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278 | |
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279 | |
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