1 | // SigmaGeneric.h is a part of the PYTHIA event generator. |
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2 | // Copyright (C) 2012 Johan Bijnens,Torbjorn Sjostrand. |
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3 | // PYTHIA is licenced under the GNU GPL version 2, see COPYING for details. |
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4 | // Please respect the MCnet Guidelines, see GUIDELINES for details. |
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5 | |
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6 | // Header file for various generic production processes, to be used as |
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7 | // building blocks for some BSM processes. |
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8 | // Currently represented by QCD pair production of colour triplet objects, |
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9 | // with spin either 0, 1/2 or 1. |
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10 | |
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11 | #ifndef Pythia8_SigmaGeneric_H |
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12 | #define Pythia8_SigmaGeneric_H |
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13 | |
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14 | #include "SigmaProcess.h" |
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15 | |
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16 | namespace Pythia8 { |
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17 | |
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18 | //========================================================================== |
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19 | |
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20 | // A derived class for g g -> qG qGbar (generic quark of spin 0, 1/2 or 1). |
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21 | |
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22 | class Sigma2gg2qGqGbar : public Sigma2Process { |
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23 | |
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24 | public: |
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25 | |
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26 | // Constructor. |
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27 | Sigma2gg2qGqGbar(int idIn, int codeIn, int spinIn, |
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28 | string nameIn = "g g -> qG qGbar") : idNew(idIn), codeSave(codeIn), |
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29 | spinSave(spinIn), nameSave(nameIn) {} |
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30 | |
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31 | // Initialize process. |
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32 | virtual void initProc(); |
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33 | |
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34 | // Calculate flavour-independent parts of cross section. |
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35 | virtual void sigmaKin(); |
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36 | |
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37 | // Evaluate sigmaHat(sHat). |
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38 | virtual double sigmaHat() {return sigma;} |
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39 | |
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40 | // Select flavour, colour and anticolour. |
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41 | virtual void setIdColAcol(); |
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42 | |
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43 | // Info on the subprocess. |
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44 | virtual string name() const {return nameSave;} |
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45 | virtual int code() const {return codeSave;} |
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46 | virtual string inFlux() const {return "gg";} |
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47 | virtual int id3Mass() const {return idNew;} |
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48 | virtual int id4Mass() const {return idNew;} |
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49 | |
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50 | private: |
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51 | |
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52 | // Values stored for process type and colour flow selection. |
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53 | int idNew, codeSave, spinSave, nCHV; |
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54 | string nameSave; |
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55 | bool hasKappa; |
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56 | double openFracPair, sigma, sigTS, sigUS, sigSum, kappam1; |
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57 | |
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58 | }; |
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59 | |
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60 | //========================================================================== |
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61 | |
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62 | // A derived class for q qbar -> qG qGbar (generic quark of spin 0, 1/2 or 1). |
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63 | |
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64 | class Sigma2qqbar2qGqGbar : public Sigma2Process { |
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65 | |
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66 | public: |
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67 | |
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68 | // Constructor. |
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69 | Sigma2qqbar2qGqGbar(int idIn, int codeIn, int spinIn, |
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70 | string nameIn = "q qbar -> qG qGbar") : idNew(idIn), codeSave(codeIn), |
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71 | spinSave(spinIn), nameSave(nameIn) {} |
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72 | |
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73 | // Initialize process. |
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74 | virtual void initProc(); |
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75 | |
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76 | // Calculate flavour-independent parts of cross section. |
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77 | virtual void sigmaKin(); |
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78 | |
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79 | // Evaluate sigmaHat(sHat). |
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80 | virtual double sigmaHat() {return sigma;} |
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81 | |
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82 | // Select flavour, colour and anticolour. |
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83 | virtual void setIdColAcol(); |
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84 | |
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85 | // Info on the subprocess. |
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86 | virtual string name() const {return nameSave;} |
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87 | virtual int code() const {return codeSave;} |
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88 | virtual string inFlux() const {return "qqbarSame";} |
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89 | virtual int id3Mass() const {return idNew;} |
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90 | virtual int id4Mass() const {return idNew;} |
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91 | |
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92 | private: |
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93 | |
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94 | // Values stored for process type and colour flow selection. |
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95 | int idNew, codeSave, spinSave, nCHV; |
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96 | string nameSave; |
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97 | double openFracPair, sigma, sigTS, sigUS, sigSum, kappa; |
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98 | |
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99 | }; |
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100 | |
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101 | //========================================================================== |
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102 | |
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103 | // A derived class for f fbar -> fG fGbar (generic spin 0, 1/2 or 1 particle) |
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104 | // via gamma^*/Z^* s-channel exchange. Still under development!! ?? |
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105 | |
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106 | class Sigma2ffbar2fGfGbar : public Sigma2Process { |
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107 | |
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108 | public: |
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109 | |
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110 | // Constructor. |
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111 | Sigma2ffbar2fGfGbar(int idIn, int codeIn, int spinIn, |
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112 | string nameIn = "q qbar -> qG qGbar") : idNew(idIn), codeSave(codeIn), |
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113 | spinSave(spinIn), nameSave(nameIn) {} |
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114 | |
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115 | // Initialize process. |
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116 | virtual void initProc(); |
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117 | |
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118 | // Calculate flavour-independent parts of cross section. |
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119 | virtual void sigmaKin(); |
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120 | |
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121 | // Evaluate sigmaHat(sHat). |
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122 | virtual double sigmaHat(); |
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123 | |
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124 | // Select flavour, colour and anticolour. |
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125 | virtual void setIdColAcol(); |
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126 | |
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127 | // Info on the subprocess. |
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128 | virtual string name() const {return nameSave;} |
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129 | virtual int code() const {return codeSave;} |
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130 | virtual string inFlux() const {return "ffbarSame";} |
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131 | virtual int id3Mass() const {return idNew;} |
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132 | virtual int id4Mass() const {return idNew;} |
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133 | |
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134 | private: |
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135 | |
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136 | // Values stored for process type and colour flow selection. |
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137 | int idNew, codeSave, spinSave, nCHV; |
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138 | string nameSave; |
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139 | bool hasColour; |
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140 | double eQHV2, openFracPair, sigma0, sigTS, sigUS, sigSum, kappa, colFac; |
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141 | |
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142 | }; |
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143 | |
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144 | //========================================================================== |
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145 | |
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146 | // A derived class for f fbar -> Zv, where Zv couples both to the SM and |
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147 | // to a hidden sector. Primitive coupling structure. |
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148 | |
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149 | class Sigma1ffbar2Zv : public Sigma1Process { |
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150 | |
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151 | public: |
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152 | |
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153 | // Constructor. |
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154 | Sigma1ffbar2Zv() {} |
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155 | |
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156 | // Initialize process. |
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157 | virtual void initProc(); |
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158 | |
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159 | // Calculate flavour-independent parts of cross section. |
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160 | virtual void sigmaKin(); |
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161 | |
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162 | // Evaluate sigmaHat(sHat) for given inflavours. |
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163 | virtual double sigmaHat(); |
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164 | |
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165 | // Select flavour, colour and anticolour. |
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166 | virtual void setIdColAcol(); |
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167 | |
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168 | // Evaluate weight for decay angles. |
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169 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
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170 | |
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171 | // Info on the subprocess. |
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172 | virtual string name() const {return "f fbar -> Zv";} |
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173 | virtual int code() const {return 4941;} |
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174 | virtual string inFlux() const {return "ffbarSame";} |
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175 | virtual int resonanceA() const {return 4900023;} |
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176 | |
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177 | private: |
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178 | |
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179 | // Store flavour-specific process information and standard prefactor. |
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180 | int idZv; |
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181 | double mRes, GammaRes, m2Res, GamMRat, sigOut; |
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182 | |
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183 | // Pointer to properties of Zv, to access decay width. |
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184 | ParticleDataEntry* particlePtr; |
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185 | |
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186 | }; |
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187 | |
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188 | //========================================================================== |
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189 | |
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190 | } // end namespace Pythia8 |
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191 | |
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192 | #endif // Pythia8_SigmaGeneric_H |
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