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 | // $Id: G4PomeronCrossSection.cc,v 1.6 2006/11/07 12:51:39 gunter Exp $ |
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28 | // GEANT4 tag $Name: $ |
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29 | // |
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30 | |
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31 | #include "G4PomeronCrossSection.hh" |
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32 | |
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33 | G4PomeronCrossSection::G4PomeronCrossSection() |
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34 | {;} |
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35 | |
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36 | |
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37 | G4PomeronCrossSection::~G4PomeronCrossSection() |
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38 | {;} |
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39 | //********************************************************************************************** |
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40 | |
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41 | G4PomeronCrossSection::G4PomeronCrossSection(const G4ParticleDefinition * particle) |
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42 | { |
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43 | G4int Encoding = std::abs(particle->GetPDGEncoding()); |
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44 | |
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45 | if (std::abs(particle->GetBaryonNumber())!=0) |
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46 | InitForNucleon(); |
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47 | else if (Encoding/100== 3 || Encoding/10 == 3) |
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48 | InitForKaon(); |
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49 | else |
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50 | InitForPion(); |
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51 | } |
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52 | |
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53 | //********************************************************************************************** |
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54 | |
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55 | G4PomeronCrossSection::G4PomeronCrossSection(const G4Proton * ) |
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56 | { |
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57 | InitForNucleon(); |
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58 | } |
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59 | G4PomeronCrossSection::G4PomeronCrossSection(const G4Neutron * ) |
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60 | { |
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61 | InitForNucleon(); |
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62 | } |
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63 | |
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64 | G4PomeronCrossSection::G4PomeronCrossSection(const G4PionPlus * ) |
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65 | { |
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66 | InitForPion(); |
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67 | } |
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68 | G4PomeronCrossSection::G4PomeronCrossSection(const G4PionMinus * ) |
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69 | { |
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70 | InitForPion(); |
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71 | } |
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72 | G4PomeronCrossSection::G4PomeronCrossSection(const G4PionZero * ) |
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73 | { |
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74 | InitForPion(); |
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75 | } |
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76 | |
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77 | G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonPlus * ) |
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78 | { |
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79 | InitForKaon(); |
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80 | } |
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81 | G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonMinus * ) |
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82 | { |
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83 | InitForKaon(); |
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84 | } |
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85 | G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonZero * ) |
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86 | { |
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87 | InitForKaon(); |
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88 | } |
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89 | G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonZeroLong * ) |
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90 | { |
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91 | InitForKaon(); |
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92 | } |
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93 | G4PomeronCrossSection::G4PomeronCrossSection(const G4KaonZeroShort * ) |
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94 | { |
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95 | InitForKaon(); |
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96 | } |
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97 | G4PomeronCrossSection::G4PomeronCrossSection(const G4Gamma * ) |
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98 | { |
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99 | InitForGamma(); |
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100 | } |
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101 | |
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102 | G4double G4PomeronCrossSection::GetTotalCrossSection(const G4double s) |
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103 | { |
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104 | G4double FZ2= Expand(Z(s)/2); |
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105 | return SigP(s) * FZ2; |
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106 | } |
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107 | |
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108 | |
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109 | G4double G4PomeronCrossSection::GetElasticCrossSection(const G4double s) |
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110 | { |
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111 | return SigP(s)/pomeron_C *(Expand(Z(s)/2) - Expand(Z(s))); |
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112 | } |
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113 | |
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114 | G4double G4PomeronCrossSection::GetDiffractiveCrossSection(const G4double s) |
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115 | { |
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116 | return ( pomeron_C -1) * GetElasticCrossSection(s); |
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117 | } |
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118 | |
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119 | G4double G4PomeronCrossSection::GetInelasticCrossSection(const G4double s) |
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120 | { |
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121 | return GetTotalCrossSection(s) - GetElasticCrossSection(s); |
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122 | } |
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123 | |
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124 | //-------------------------Probabilities ---------------------------- |
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125 | |
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126 | G4double G4PomeronCrossSection::GetTotalProbability(const G4double s, |
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127 | const G4double impactsquare) |
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128 | { |
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129 | return 2/pomeron_C*(1-std::exp(-1*Eikonal(s,impactsquare))); |
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130 | } |
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131 | |
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132 | G4double G4PomeronCrossSection::GetDiffractiveProbability(const G4double s, |
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133 | const G4double impactsquare) |
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134 | { |
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135 | return (pomeron_C-1)/pomeron_C * |
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136 | (GetTotalProbability(s,impactsquare) - |
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137 | GetNondiffractiveProbability(s,impactsquare)); |
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138 | } |
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139 | |
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140 | G4double G4PomeronCrossSection::GetNondiffractiveProbability(const G4double s, |
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141 | const G4double impactsquare) |
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142 | { |
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143 | return (1-std::exp(-2*Eikonal(s,impactsquare)))/pomeron_C; |
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144 | } |
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145 | |
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146 | G4double G4PomeronCrossSection::GetElasticProbability(const G4double s, |
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147 | const G4double impactsquare) |
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148 | { |
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149 | return (GetTotalProbability(s,impactsquare) - |
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150 | GetInelasticProbability(s,impactsquare)); |
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151 | } |
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152 | |
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153 | G4double G4PomeronCrossSection::GetInelasticProbability(const G4double s, |
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154 | const G4double impactsquare) |
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155 | { |
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156 | return GetNondiffractiveProbability(s,impactsquare) + |
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157 | GetDiffractiveProbability(s,impactsquare); |
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158 | } |
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159 | |
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160 | G4double G4PomeronCrossSection::GetCutPomeronProbability(const G4double s, |
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161 | const G4double impactsquare, const G4int nPomerons) |
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162 | { |
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163 | G4double factorial=1; |
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164 | for (G4int i=2; i<= nPomerons ; i++) |
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165 | { factorial *= i; |
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166 | } |
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167 | |
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168 | return std::exp(-2*Eikonal(s,impactsquare))/pomeron_C* |
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169 | std::pow(2*Eikonal(s,impactsquare),nPomerons)/factorial; |
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170 | } |
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171 | |
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172 | // ---------------Temporary --- GF |
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173 | void G4PomeronCrossSection::Setgamma(const G4double agam) |
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174 | { |
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175 | pomeron_Gamma=agam/GeV/GeV; |
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176 | } |
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177 | |
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178 | |
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179 | //----------------- private/Implementation methods |
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180 | |
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181 | void G4PomeronCrossSection::InitForNucleon() |
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182 | { |
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183 | // pomeron_S= 3.0*GeV*GeV; |
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184 | pomeron_S= 2.7*GeV*GeV; |
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185 | // pomeron_Gamma= 2.16/GeV/GeV; |
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186 | // pomeron_Gamma= 3.96/GeV/GeV; |
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187 | pomeron_Gamma= (2.6+3.96)/GeV/GeV; |
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188 | pomeron_C= 1.4; |
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189 | pomeron_Rsquare= 3.56/GeV/GeV; |
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190 | // pomeron_Alpha= 1.0808; |
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191 | pomeron_Alpha= 0.9808; |
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192 | pomeron_Alphaprime= 0.25/GeV/GeV; |
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193 | pomeron_Gamma_Hard = 0.0002/GeV/GeV; // Note! if pomeron_Gamma_Hard != 0 to fit total pp-crosscection |
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194 | // pomeron_Gamma_Soft shold be 2.35/GeV/GeV |
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195 | pomeron_Alpha_Hard = 1.47; |
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196 | } |
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197 | |
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198 | void G4PomeronCrossSection::InitForPion() |
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199 | { |
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200 | pomeron_S= 1.5*GeV*GeV; |
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201 | // pomeron_Gamma= 1.46/GeV/GeV; |
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202 | pomeron_Gamma= 2.17/GeV/GeV; |
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203 | pomeron_C= 1.6; |
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204 | pomeron_Rsquare= 2.36/GeV/GeV; |
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205 | pomeron_Alpha= 1.0808; |
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206 | pomeron_Alphaprime= 0.25/GeV/GeV; |
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207 | pomeron_Gamma_Hard = 0.0002/GeV/GeV; |
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208 | pomeron_Alpha_Hard = 1.47; |
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209 | } |
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210 | |
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211 | void G4PomeronCrossSection::InitForKaon() |
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212 | { |
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213 | pomeron_S= 2.3*GeV*GeV; |
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214 | // pomeron_Gamma= 1.31/GeV/GeV; |
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215 | pomeron_Gamma= 1.92/GeV/GeV; |
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216 | pomeron_C= 1.8; |
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217 | pomeron_Rsquare= 1.96/GeV/GeV; |
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218 | pomeron_Alpha= 1.0808; |
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219 | pomeron_Alphaprime= 0.25/GeV/GeV; |
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220 | pomeron_Gamma_Hard = 0.0002/GeV/GeV; |
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221 | pomeron_Alpha_Hard = 1.47; |
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222 | } |
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223 | |
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224 | void G4PomeronCrossSection::InitForGamma() |
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225 | { |
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226 | pomeron_S= 1.7*GeV*GeV; |
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227 | // pomeron_Gamma= 1.42/GeV/GeV; |
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228 | pomeron_Gamma= 2.07/GeV/GeV; |
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229 | pomeron_C= 1.7; |
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230 | pomeron_Rsquare= 2.16/GeV/GeV; |
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231 | pomeron_Alpha= 1.0808; |
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232 | pomeron_Alphaprime= 0.25/GeV/GeV; |
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233 | pomeron_Gamma_Hard = 0.0002/GeV/GeV; |
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234 | pomeron_Alpha_Hard = 1.47; |
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235 | } |
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236 | |
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237 | G4double G4PomeronCrossSection::Expand(G4double z) |
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238 | { |
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239 | |
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240 | G4double sum=1.; |
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241 | G4double current=1.; |
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242 | for (G4int j=2; j<21; j++ ) |
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243 | { |
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244 | current *= -z *(j-1)/sqr(j); |
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245 | sum+=current; |
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246 | } |
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247 | return sum; |
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248 | } |
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249 | |
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250 | inline G4double G4PomeronCrossSection::Power(const G4double s) |
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251 | { |
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252 | return pomeron_Gamma *std::pow(s/pomeron_S, pomeron_Alpha -1); |
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253 | } |
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254 | |
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255 | inline G4double G4PomeronCrossSection::Z(const G4double s) |
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256 | { |
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257 | return 2*pomeron_C * Power(s) / Lambda(s); |
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258 | } |
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259 | |
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260 | inline G4double G4PomeronCrossSection::Lambda(const G4double s) |
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261 | { |
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262 | return pomeron_Rsquare+pomeron_Alphaprime*std::log(s/pomeron_S); |
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263 | } |
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264 | |
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265 | inline G4double G4PomeronCrossSection::SigP(const G4double s) |
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266 | { |
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267 | return 8 * pi * hbarc_squared * Power(s); |
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268 | } |
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269 | |
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270 | inline G4double G4PomeronCrossSection::Eikonal(const G4double s, |
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271 | const G4double impactsquare) |
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272 | { |
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273 | return Z(s)/2 * std::exp(-impactsquare/(4*Lambda(s)*hbarc_squared)); |
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274 | } |
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275 | //************************************************************************************************* |
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276 | inline G4double G4PomeronCrossSection::PowerSoft(const G4double s) |
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277 | { |
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278 | return pomeron_Gamma *std::pow(s/pomeron_S, pomeron_Alpha -1); |
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279 | } |
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280 | |
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281 | inline G4double G4PomeronCrossSection::PowerHard(const G4double s) |
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282 | { |
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283 | return pomeron_Gamma_Hard*std::pow(s/pomeron_S, pomeron_Alpha_Hard -1); |
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284 | } |
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285 | |
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286 | inline G4double G4PomeronCrossSection::LambdaSoft(const G4double s) |
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287 | { |
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288 | return pomeron_Rsquare+pomeron_Alphaprime*std::log(s/pomeron_S); |
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289 | } |
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290 | |
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291 | inline G4double G4PomeronCrossSection::LambdaHard(const G4double /*s*/) |
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292 | { |
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293 | return pomeron_Rsquare; //+pomeron_Alphaprime*std::log(s/pomeron_S); |
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294 | } |
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295 | |
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296 | inline G4double G4PomeronCrossSection::Zsoft(const G4double s) |
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297 | { |
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298 | return 2*pomeron_C*PowerHard(s) / LambdaSoft(s); |
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299 | } |
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300 | |
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301 | inline G4double G4PomeronCrossSection::Zhard(const G4double s) |
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302 | { |
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303 | return 2*pomeron_C*PowerHard(s)/LambdaHard(s); |
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304 | } |
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305 | |
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306 | G4double G4PomeronCrossSection::SoftEikonal(G4double s, G4double impactsquare) |
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307 | { |
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308 | return Zsoft(s)/2*std::exp(-impactsquare/LambdaSoft(s)/hbarc_squared/4); |
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309 | } |
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310 | |
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311 | G4double G4PomeronCrossSection::HardEikonal(G4double s, G4double impactsquare) |
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312 | { |
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313 | return Zhard(s)/2*std::exp(-impactsquare/LambdaHard(s)/hbarc_squared/4); |
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314 | } |
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315 | |
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316 | //************************************************************************************************* |
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