1 | // SigmaNewGaugeBosons.h is a part of the PYTHIA event generator. |
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2 | // Copyright (C) 2012 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 new-gauge-boson-process differential cross sections. |
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7 | // Contains classes derived from SigmaProcess via Sigma1Process. |
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8 | |
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9 | #ifndef Pythia8_SigmaNewGaugeBosons_H |
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10 | #define Pythia8_SigmaNewGaugeBosons_H |
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11 | |
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12 | #include "PythiaComplex.h" |
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13 | #include "SigmaProcess.h" |
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14 | |
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15 | namespace Pythia8 { |
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16 | |
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17 | //========================================================================== |
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18 | |
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19 | // An intermediate class for f fbar -> Z'/W' -> WW/WZ -> 4 fermions. |
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20 | // Copied from SigmaEW for gauge-boson-pair production. |
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21 | |
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22 | class Sigma1ffbarZprimeWprime: public Sigma1Process { |
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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 | Sigma1ffbarZprimeWprime() {} |
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28 | |
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29 | protected: |
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30 | |
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31 | // Internal products. |
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32 | Vec4 pRot[7]; |
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33 | complex hA[7][7]; |
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34 | complex hC[7][7]; |
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35 | |
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36 | // Calculate and store internal products. |
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37 | void setupProd( Event& process, int i1, int i2, int i3, int i4, |
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38 | int i5, int i6); |
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39 | |
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40 | // Evaluate the F function of Gunion and Kunszt. |
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41 | complex fGK(int i1, int i2, int i3, int i4, int i5, int i6); |
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42 | |
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43 | // Evaluate the Xi function of Gunion and Kunszt. |
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44 | double xiGK( double tHnow, double uHnow, double s3now, double s4now); |
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45 | |
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46 | // Evaluate the Xj function of Gunion and Kunszt. |
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47 | double xjGK( double tHnow, double uHnow, double s3now, double s4now); |
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48 | |
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49 | private: |
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50 | |
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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 | // A derived class for f fbar -> gamma*/Z0/Z'0. |
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56 | |
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57 | class Sigma1ffbar2gmZZprime : public Sigma1ffbarZprimeWprime { |
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58 | |
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59 | public: |
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60 | |
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61 | // Constructor. |
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62 | Sigma1ffbar2gmZZprime() {} |
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63 | |
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64 | // Initialize process. |
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65 | virtual void initProc(); |
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66 | |
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67 | // Calculate flavour-independent parts of cross section. |
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68 | virtual void sigmaKin(); |
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69 | |
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70 | // Evaluate sigmaHat(sHat). |
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71 | virtual double sigmaHat(); |
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72 | |
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73 | // Select flavour, colour and anticolour. |
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74 | virtual void setIdColAcol(); |
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75 | |
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76 | // Evaluate weight for Z' decay angle. |
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77 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
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78 | |
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79 | // Info on the subprocess. |
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80 | virtual string name() const {return "f fbar -> gamma*/Z0/Zprime0";} |
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81 | virtual int code() const {return 3001;} |
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82 | virtual string inFlux() const {return "ffbarSame";} |
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83 | virtual int resonanceA() const {return 23;} |
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84 | virtual int resonanceB() const {return 32;} |
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85 | |
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86 | private: |
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87 | |
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88 | // Parameters set at initialization or for each new event. |
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89 | int gmZmode; |
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90 | double mRes, GammaRes, m2Res, GamMRat, sin2tW, cos2tW, thetaWRat, |
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91 | mZ, GammaZ, m2Z, GamMRatZ, afZp[20], vfZp[20], coupZpWW, |
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92 | anglesZpWW, gamSum, gamZSum, ZSum, gamZpSum, ZZpSum, ZpSum, |
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93 | gamNorm, gamZNorm, ZNorm, gamZpNorm, ZZpNorm, ZpNorm; |
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94 | |
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95 | // Pointer to properties of the particle species, to access decay channels. |
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96 | ParticleDataEntry* particlePtr; |
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97 | |
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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 | // A derived class for f fbar' -> W'+-. |
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103 | |
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104 | class Sigma1ffbar2Wprime : public Sigma1ffbarZprimeWprime { |
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105 | |
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106 | public: |
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107 | |
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108 | // Constructor. |
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109 | Sigma1ffbar2Wprime() {} |
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110 | |
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111 | // Initialize process. |
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112 | virtual void initProc(); |
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113 | |
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114 | // Calculate flavour-independent parts of cross section. |
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115 | virtual void sigmaKin(); |
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116 | |
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117 | // Evaluate sigmaHat(sHat). |
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118 | virtual double sigmaHat(); |
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119 | |
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120 | // Select flavour, colour and anticolour. |
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121 | virtual void setIdColAcol(); |
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122 | |
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123 | // Evaluate weight for W decay angle. |
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124 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
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125 | |
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126 | // Info on the subprocess. |
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127 | virtual string name() const {return "f fbar' -> W'+-";} |
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128 | virtual int code() const {return 3021;} |
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129 | virtual string inFlux() const {return "ffbarChg";} |
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130 | virtual int resonanceA() const {return 34;} |
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131 | |
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132 | private: |
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133 | |
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134 | // Parameters set at initialization. |
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135 | double mRes, GammaRes, m2Res, GamMRat, thetaWRat, sigma0Pos, sigma0Neg, |
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136 | aqWp, vqWp, alWp, vlWp, coupWpWZ, anglesWpWZ; |
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137 | |
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138 | // Pointer to properties of the particle species, to access decay channels. |
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139 | ParticleDataEntry* particlePtr; |
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140 | |
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141 | }; |
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142 | //========================================================================== |
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143 | |
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144 | // A derived class for f fbar' -> R^0 (horizontal gauge boson). |
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145 | |
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146 | class Sigma1ffbar2Rhorizontal : public Sigma1Process { |
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147 | |
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148 | public: |
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149 | |
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150 | // Constructor. |
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151 | Sigma1ffbar2Rhorizontal() {} |
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152 | |
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153 | // Initialize process. |
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154 | virtual void initProc(); |
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155 | |
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156 | // Calculate flavour-independent parts of cross section. |
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157 | virtual void sigmaKin(); |
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158 | |
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159 | // Evaluate sigmaHat(sHat). |
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160 | virtual double sigmaHat(); |
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161 | |
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162 | // Select flavour, colour and anticolour. |
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163 | virtual void setIdColAcol(); |
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164 | |
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165 | // Info on the subprocess. |
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166 | virtual string name() const {return "f fbar' -> R^0";} |
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167 | virtual int code() const {return 3041;} |
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168 | virtual string inFlux() const {return "ffbar";} |
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169 | virtual int resonanceA() const {return 41;} |
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170 | |
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171 | private: |
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172 | |
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173 | // Parameters set at initialization. |
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174 | double mRes, GammaRes, m2Res, GamMRat, thetaWRat, sigma0Pos, sigma0Neg; |
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175 | |
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176 | // Pointer to properties of the particle species, to access decay channels. |
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177 | ParticleDataEntry* particlePtr; |
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178 | |
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179 | }; |
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180 | |
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181 | //========================================================================== |
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182 | |
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183 | } // end namespace Pythia8 |
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184 | |
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185 | #endif // Pythia_SigmaNewGaugeBosons_H |
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