1 | // SigmaEW.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 electroweak process differential cross sections. |
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7 | // Contains classes derived from SigmaProcess via Sigma(1/2)Process. |
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8 | |
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9 | #ifndef Pythia8_SigmaEW_H |
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10 | #define Pythia8_SigmaEW_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 | |
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20 | // A derived class for q g -> q gamma (q = u, d, s, c, b). |
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21 | // Use massless approximation also for Q since no alternative. |
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22 | |
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23 | class Sigma2qg2qgamma : public Sigma2Process { |
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24 | |
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25 | public: |
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26 | |
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27 | // Constructor. |
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28 | Sigma2qg2qgamma() {} |
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29 | |
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30 | // Calculate flavour-independent parts of cross section. |
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31 | virtual void sigmaKin(); |
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32 | |
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33 | // Evaluate d(sigmaHat)/d(tHat). |
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34 | virtual double sigmaHat(); |
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35 | |
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36 | // Select flavour, colour and anticolour. |
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37 | virtual void setIdColAcol(); |
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38 | |
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39 | // Info on the subprocess. |
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40 | virtual string name() const {return "q g -> q gamma (udscb)";} |
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41 | virtual int code() const {return 201;} |
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42 | virtual string inFlux() const {return "qg";} |
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43 | |
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44 | private: |
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45 | |
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46 | // Values stored for later use. |
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47 | double mNew, m2New, sigUS, sigma0; |
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48 | |
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49 | }; |
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50 | |
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51 | //========================================================================== |
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52 | |
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53 | // A derived class for q qbar -> g gamma. |
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54 | |
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55 | class Sigma2qqbar2ggamma : public Sigma2Process { |
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56 | |
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57 | public: |
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58 | |
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59 | // Constructor. |
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60 | Sigma2qqbar2ggamma() {} |
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61 | |
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62 | // Calculate flavour-independent parts of cross section. |
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63 | virtual void sigmaKin(); |
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64 | |
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65 | // Evaluate d(sigmaHat)/d(tHat). |
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66 | virtual double sigmaHat(); |
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67 | |
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68 | // Select flavour, colour and anticolour. |
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69 | virtual void setIdColAcol(); |
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70 | |
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71 | // Info on the subprocess. |
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72 | virtual string name() const {return "q qbar -> g gamma";} |
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73 | virtual int code() const {return 202;} |
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74 | virtual string inFlux() const {return "qqbarSame";} |
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75 | |
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76 | private: |
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77 | |
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78 | // Values stored for later use. |
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79 | double sigma0; |
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80 | |
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81 | }; |
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82 | |
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83 | //========================================================================== |
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84 | |
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85 | // A derived class for g g -> g gamma. |
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86 | |
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87 | class Sigma2gg2ggamma : public Sigma2Process { |
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88 | |
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89 | public: |
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90 | |
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91 | // Constructor. |
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92 | Sigma2gg2ggamma() {} |
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93 | |
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94 | // Initialize process. |
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95 | virtual void initProc(); |
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96 | |
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97 | // Calculate flavour-independent parts of cross section. |
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98 | virtual void sigmaKin(); |
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99 | |
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100 | // Evaluate d(sigmaHat)/d(tHat). |
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101 | virtual double sigmaHat() {return sigma;} |
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102 | |
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103 | // Select flavour, colour and anticolour. |
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104 | virtual void setIdColAcol(); |
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105 | |
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106 | // Info on the subprocess. |
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107 | virtual string name() const {return "g g -> g gamma";} |
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108 | virtual int code() const {return 203;} |
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109 | virtual string inFlux() const {return "gg";} |
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110 | |
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111 | private: |
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112 | |
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113 | // Values stored for later use. |
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114 | double chargeSum, sigma; |
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115 | |
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116 | }; |
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117 | |
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118 | //========================================================================== |
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119 | |
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120 | // A derived class for f fbar -> gamma gamma. |
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121 | |
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122 | class Sigma2ffbar2gammagamma : public Sigma2Process { |
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123 | |
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124 | public: |
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125 | |
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126 | // Constructor. |
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127 | Sigma2ffbar2gammagamma() {} |
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128 | |
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129 | // Calculate flavour-independent parts of cross section. |
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130 | virtual void sigmaKin(); |
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131 | |
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132 | // Evaluate d(sigmaHat)/d(tHat). |
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133 | virtual double sigmaHat(); |
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134 | |
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135 | // Select flavour, colour and anticolour. |
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136 | virtual void setIdColAcol(); |
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137 | |
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138 | // Info on the subprocess. |
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139 | virtual string name() const {return "f fbar -> gamma gamma";} |
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140 | virtual int code() const {return 204;} |
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141 | virtual string inFlux() const {return "ffbarSame";} |
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142 | |
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143 | private: |
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144 | |
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145 | // Values stored for later use. |
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146 | double sigTU, sigma0; |
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147 | |
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148 | }; |
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149 | |
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150 | //========================================================================== |
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151 | |
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152 | // A derived class for g g -> gamma gamma. |
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153 | |
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154 | class Sigma2gg2gammagamma : public Sigma2Process { |
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155 | |
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156 | public: |
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157 | |
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158 | // Constructor. |
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159 | Sigma2gg2gammagamma() {} |
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160 | |
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161 | // Initialize process. |
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162 | virtual void initProc(); |
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163 | |
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164 | // Calculate flavour-independent parts of cross section. |
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165 | virtual void sigmaKin(); |
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166 | |
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167 | // Evaluate d(sigmaHat)/d(tHat). |
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168 | virtual double sigmaHat() {return sigma;} |
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169 | |
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170 | // Select flavour, colour and anticolour. |
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171 | virtual void setIdColAcol(); |
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172 | |
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173 | // Info on the subprocess. |
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174 | virtual string name() const {return "g g -> gamma gamma";} |
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175 | virtual int code() const {return 205;} |
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176 | virtual string inFlux() const {return "gg";} |
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177 | |
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178 | private: |
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179 | |
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180 | double charge2Sum, sigma; |
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181 | |
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182 | }; |
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183 | |
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184 | //========================================================================== |
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185 | |
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186 | // A derived class for f f' -> f f' via t-channel gamma*/Z0 exchange. |
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187 | |
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188 | class Sigma2ff2fftgmZ : public Sigma2Process { |
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189 | |
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190 | public: |
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191 | |
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192 | // Constructor. |
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193 | Sigma2ff2fftgmZ() {} |
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194 | |
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195 | // Initialize process. |
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196 | virtual void initProc(); |
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197 | |
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198 | // Calculate flavour-independent parts of cross section. |
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199 | virtual void sigmaKin(); |
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200 | |
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201 | // Evaluate sigmaHat(sHat). |
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202 | virtual double sigmaHat(); |
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203 | |
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204 | // Select flavour, colour and anticolour. |
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205 | virtual void setIdColAcol(); |
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206 | |
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207 | // Info on the subprocess. |
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208 | virtual string name() const {return "f f' -> f f' (t-channel gamma*/Z0)";} |
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209 | virtual int code() const {return 211;} |
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210 | virtual string inFlux() const {return "ff";} |
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211 | |
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212 | private: |
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213 | |
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214 | // Z parameters for propagator. |
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215 | int gmZmode; |
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216 | double mZ, mZS, thetaWRat, sigmagmgm, sigmagmZ, sigmaZZ; |
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217 | |
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218 | }; |
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219 | |
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220 | //========================================================================== |
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221 | |
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222 | // A derived class for f_1 f_2 -> f_3 f_4 via t-channel W+- exchange. |
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223 | |
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224 | class Sigma2ff2fftW : public Sigma2Process { |
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225 | |
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226 | public: |
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227 | |
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228 | // Constructor. |
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229 | Sigma2ff2fftW() {} |
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230 | |
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231 | // Initialize process. |
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232 | virtual void initProc(); |
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233 | |
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234 | // Calculate flavour-independent parts of cross section. |
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235 | virtual void sigmaKin(); |
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236 | |
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237 | // Evaluate sigmaHat(sHat). |
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238 | virtual double sigmaHat(); |
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239 | |
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240 | // Select flavour, colour and anticolour. |
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241 | virtual void setIdColAcol(); |
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242 | |
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243 | // Info on the subprocess. |
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244 | virtual string name() const {return "f_1 f_2 -> f_3 f_4 (t-channel W+-)";} |
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245 | virtual int code() const {return 212;} |
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246 | virtual string inFlux() const {return "ff";} |
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247 | |
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248 | private: |
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249 | |
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250 | // W parameters for propagator. |
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251 | double mW, mWS, thetaWRat, sigma0; |
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252 | |
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253 | }; |
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254 | |
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255 | //========================================================================== |
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256 | |
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257 | // A derived class for q q' -> Q q" via t-channel W+- exchange. |
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258 | // Related to Sigma2ff2fftW class, but with massive matrix elements. |
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259 | |
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260 | class Sigma2qq2QqtW : public Sigma2Process { |
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261 | |
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262 | public: |
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263 | |
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264 | // Constructor. |
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265 | Sigma2qq2QqtW(int idIn, int codeIn) : idNew(idIn), codeSave(codeIn) {} |
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266 | |
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267 | // Initialize process. |
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268 | virtual void initProc(); |
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269 | |
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270 | // Calculate flavour-independent parts of cross section. |
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271 | virtual void sigmaKin(); |
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272 | |
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273 | // Evaluate sigmaHat(sHat). |
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274 | virtual double sigmaHat(); |
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275 | |
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276 | // Select flavour, colour and anticolour. |
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277 | virtual void setIdColAcol(); |
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278 | |
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279 | // Evaluate weight for W decay angles in top decay (else inactive). |
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280 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
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281 | |
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282 | // Info on the subprocess. |
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283 | virtual string name() const {return nameSave;} |
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284 | virtual int code() const {return codeSave;} |
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285 | virtual string inFlux() const {return "ff";} |
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286 | virtual int id3Mass() const {return idNew;} |
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287 | |
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288 | private: |
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289 | |
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290 | // Values stored for process type. W parameters for propagator. |
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291 | int idNew, codeSave; |
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292 | string nameSave; |
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293 | double mW, mWS, thetaWRat, sigma0, openFracPos, openFracNeg; |
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294 | |
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295 | }; |
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296 | |
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297 | //========================================================================== |
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298 | |
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299 | // A derived class for f fbar -> gamma*/Z0. |
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300 | |
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301 | class Sigma1ffbar2gmZ : public Sigma1Process { |
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302 | |
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303 | public: |
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304 | |
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305 | // Constructor. |
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306 | Sigma1ffbar2gmZ() {} |
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307 | |
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308 | // Initialize process. |
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309 | virtual void initProc(); |
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310 | |
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311 | // Calculate flavour-independent parts of cross section. |
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312 | virtual void sigmaKin(); |
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313 | |
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314 | // Evaluate sigmaHat(sHat). |
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315 | virtual double sigmaHat(); |
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316 | |
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317 | // Select flavour, colour and anticolour. |
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318 | virtual void setIdColAcol(); |
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319 | |
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320 | // Evaluate weight for Z decay angle. |
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321 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
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322 | |
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323 | // Info on the subprocess. |
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324 | virtual string name() const {return "f fbar -> gamma*/Z0";} |
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325 | virtual int code() const {return 221;} |
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326 | virtual string inFlux() const {return "ffbarSame";} |
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327 | virtual int resonanceA() const {return 23;} |
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328 | |
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329 | private: |
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330 | |
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331 | // Parameters set at initialization or for each new event. |
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332 | int gmZmode; |
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333 | double mRes, GammaRes, m2Res, GamMRat, thetaWRat, |
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334 | gamSum, intSum, resSum, gamProp, intProp, resProp; |
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335 | |
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336 | // Pointer to properties of the particle species, to access decay channels. |
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337 | ParticleDataEntry* particlePtr; |
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338 | |
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339 | }; |
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340 | |
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341 | //========================================================================== |
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342 | |
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343 | // A derived class for f fbar' -> W+-. |
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344 | |
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345 | class Sigma1ffbar2W : public Sigma1Process { |
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346 | |
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347 | public: |
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348 | |
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349 | // Constructor. |
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350 | Sigma1ffbar2W() {} |
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351 | |
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352 | // Initialize process. |
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353 | virtual void initProc(); |
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354 | |
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355 | // Calculate flavour-independent parts of cross section. |
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356 | virtual void sigmaKin(); |
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357 | |
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358 | // Evaluate sigmaHat(sHat). |
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359 | virtual double sigmaHat(); |
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360 | |
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361 | // Select flavour, colour and anticolour. |
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362 | virtual void setIdColAcol(); |
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363 | |
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364 | // Evaluate weight for W decay angle. |
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365 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
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366 | |
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367 | // Info on the subprocess. |
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368 | virtual string name() const {return "f fbar' -> W+-";} |
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369 | virtual int code() const {return 222;} |
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370 | virtual string inFlux() const {return "ffbarChg";} |
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371 | virtual int resonanceA() const {return 24;} |
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372 | |
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373 | private: |
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374 | |
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375 | // Parameters set at initialization. |
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376 | double mRes, GammaRes, m2Res, GamMRat, thetaWRat, sigma0Pos, sigma0Neg; |
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377 | |
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378 | // Pointer to properties of the particle species, to access decay channels. |
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379 | ParticleDataEntry* particlePtr; |
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380 | |
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381 | }; |
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382 | |
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383 | //========================================================================== |
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384 | |
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385 | // A derived class for f fbar -> gamma* -> f' fbar', summed over light f'. |
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386 | // Allows pT-ordered evolution for multiparton interactions. |
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387 | |
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388 | class Sigma2ffbar2ffbarsgm : public Sigma2Process { |
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389 | |
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390 | public: |
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391 | |
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392 | // Constructor. |
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393 | Sigma2ffbar2ffbarsgm() {} |
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394 | |
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395 | // Calculate flavour-independent parts of cross section. |
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396 | virtual void sigmaKin(); |
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397 | |
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398 | // Evaluate sigmaHat(sHat). |
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399 | virtual double sigmaHat(); |
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400 | |
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401 | // Select flavour, colour and anticolour. |
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402 | virtual void setIdColAcol(); |
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403 | |
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404 | // Info on the subprocess. |
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405 | virtual string name() const { |
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406 | return "f fbar -> f' fbar' (s-channel gamma*)";} |
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407 | virtual int code() const {return 223;} |
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408 | virtual string inFlux() const {return "ffbarSame";} |
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409 | virtual bool isSChannel() const {return true;} |
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410 | |
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411 | private: |
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412 | |
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413 | // Values stored for later use. |
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414 | int idNew; |
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415 | double sigma0; |
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416 | |
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417 | }; |
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418 | |
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419 | //========================================================================== |
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420 | |
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421 | // A derived class for f fbar -> gamma*/Z0 -> F Fbar, for one heavy F. |
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422 | // Allows pT cuts as for other 2 -> 2 processes. |
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423 | |
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424 | class Sigma2ffbar2FFbarsgmZ : public Sigma2Process { |
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425 | |
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426 | public: |
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427 | |
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428 | // Constructor. |
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429 | Sigma2ffbar2FFbarsgmZ(int idIn, int codeIn) : idNew(idIn), |
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430 | codeSave(codeIn) {} |
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431 | |
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432 | // Initialize process. |
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433 | virtual void initProc(); |
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434 | |
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435 | // Calculate flavour-independent parts of cross section. |
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436 | virtual void sigmaKin(); |
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437 | |
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438 | // Evaluate sigmaHat(sHat). |
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439 | virtual double sigmaHat(); |
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440 | |
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441 | // Select flavour, colour and anticolour. |
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442 | virtual void setIdColAcol(); |
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443 | |
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444 | // Evaluate weight for W decay angles in top decay (else inactive). |
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445 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
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446 | |
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447 | // Info on the subprocess. |
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448 | virtual string name() const {return nameSave;} |
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449 | virtual int code() const {return codeSave;} |
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450 | virtual string inFlux() const {return "ffbarSame";} |
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451 | virtual bool isSChannel() const {return true;} |
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452 | virtual int id3Mass() const {return idNew;} |
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453 | virtual int id4Mass() const {return idNew;} |
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454 | virtual int resonanceA() const {return 23;} |
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455 | |
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456 | private: |
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457 | |
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458 | // Values stored for process type. Z parameters for propagator. |
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459 | int idNew, codeSave, gmZmode; |
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460 | string nameSave; |
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461 | bool isPhysical; |
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462 | double ef, vf, af, mRes, GammaRes, m2Res, GamMRat, thetaWRat, |
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463 | mr, betaf, cosThe, gamProp, intProp, resProp, openFracPair; |
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464 | |
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465 | }; |
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466 | |
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467 | //========================================================================== |
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468 | |
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469 | // A derived class for f fbar' -> W+- -> F fbar", for one or two heavy F. |
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470 | // Allows pT cuts as for other 2 -> 2 processes. |
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471 | |
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472 | class Sigma2ffbar2FfbarsW : public Sigma2Process { |
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473 | |
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474 | public: |
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475 | |
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476 | // Constructor. |
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477 | Sigma2ffbar2FfbarsW(int idIn, int idIn2, int codeIn) : idNew(idIn), |
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478 | idNew2(idIn2), codeSave(codeIn) {} |
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479 | |
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480 | // Initialize process. |
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481 | virtual void initProc(); |
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482 | |
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483 | // Calculate flavour-independent parts of cross section. |
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484 | virtual void sigmaKin(); |
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485 | |
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486 | // Evaluate sigmaHat(sHat). |
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487 | virtual double sigmaHat(); |
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488 | |
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489 | // Select flavour, colour and anticolour. |
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490 | virtual void setIdColAcol(); |
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491 | |
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492 | // Evaluate weight for W decay angles in top decay (else inactive). |
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493 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
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494 | |
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495 | // Info on the subprocess. |
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496 | virtual string name() const {return nameSave;} |
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497 | virtual int code() const {return codeSave;} |
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498 | virtual string inFlux() const {return "ffbarChg";} |
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499 | virtual bool isSChannel() const {return true;} |
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500 | virtual int id3Mass() const {return idNew;} |
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501 | virtual int id4Mass() const {return idPartner;} |
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502 | virtual int resonanceA() const {return 24;} |
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503 | |
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504 | private: |
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505 | |
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506 | // Values stored for process type. W parameters for propagator. |
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507 | int idNew, idNew2, codeSave, idPartner; |
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508 | string nameSave; |
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509 | bool isPhysical; |
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510 | double V2New, mRes, GammaRes, m2Res, GamMRat, thetaWRat, sigma0, |
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511 | openFracPos, openFracNeg; |
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512 | |
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513 | }; |
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514 | |
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515 | //========================================================================== |
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516 | |
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517 | // An intermediate class for f fbar -> gamma*/Z0/W+- gamma*/Z0/W-+. |
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518 | |
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519 | class Sigma2ffbargmZWgmZW : public Sigma2Process { |
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520 | |
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521 | public: |
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522 | |
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523 | // Constructor. |
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524 | Sigma2ffbargmZWgmZW() {} |
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525 | |
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526 | protected: |
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527 | |
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528 | // Internal products. |
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529 | Vec4 pRot[7]; |
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530 | complex hA[7][7]; |
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531 | complex hC[7][7]; |
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532 | |
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533 | // Calculate and store internal products. |
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534 | void setupProd( Event& process, int i1, int i2, int i3, int i4, |
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535 | int i5, int i6); |
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536 | |
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537 | // Evaluate the F function of Gunion and Kunszt. |
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538 | complex fGK(int i1, int i2, int i3, int i4, int i5, int i6); |
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539 | |
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540 | // Evaluate the Xi function of Gunion and Kunszt. |
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541 | double xiGK( double tHnow, double uHnow); |
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542 | |
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543 | // Evaluate the Xj function of Gunion and Kunszt. |
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544 | double xjGK( double tHnow, double uHnow); |
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545 | |
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546 | private: |
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547 | |
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548 | }; |
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549 | |
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550 | //========================================================================== |
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551 | |
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552 | // A derived class for f fbar -> gamma*/Z0 gamma*/Z0. |
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553 | |
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554 | class Sigma2ffbar2gmZgmZ : public Sigma2ffbargmZWgmZW { |
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555 | |
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556 | public: |
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557 | |
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558 | // Constructor. |
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559 | Sigma2ffbar2gmZgmZ() {} |
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560 | |
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561 | // Initialize process. |
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562 | virtual void initProc(); |
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563 | |
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564 | // Calculate flavour-independent parts of cross section. |
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565 | virtual void sigmaKin(); |
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566 | |
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567 | // Evaluate d(sigmaHat)/d(tHat). |
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568 | virtual double sigmaHat(); |
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569 | |
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570 | // Select flavour, colour and anticolour. |
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571 | virtual void setIdColAcol(); |
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572 | |
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573 | // Evaluate weight for simultaneous flavour choices. |
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574 | virtual double weightDecayFlav( Event& process); |
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575 | |
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576 | // Evaluate weight for decay angles of the two gamma*/Z0. |
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577 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
---|
578 | |
---|
579 | // Info on the subprocess. |
---|
580 | virtual string name() const {return "f fbar -> gamma*/Z0 gamma*/Z0";} |
---|
581 | virtual int code() const {return 231;} |
---|
582 | virtual string inFlux() const {return "ffbarSame";} |
---|
583 | virtual int id3Mass() const {return 23;} |
---|
584 | virtual int id4Mass() const {return 23;} |
---|
585 | |
---|
586 | private: |
---|
587 | |
---|
588 | // Parameters set at initialization or for each new event. |
---|
589 | int gmZmode, i1, i2, i3, i4, i5, i6; |
---|
590 | double mRes, GammaRes, m2Res, GamMRat, thetaWRat, sigma0, |
---|
591 | gamSum3, intSum3, resSum3, gamProp3, intProp3, resProp3, |
---|
592 | gamSum4, intSum4, resSum4, gamProp4, intProp4, resProp4, |
---|
593 | c3LL, c3LR, c3RL, c3RR, c4LL, c4LR, c4RL, c4RR, flavWt; |
---|
594 | |
---|
595 | // Pointer to properties of the particle species, to access decay channels. |
---|
596 | ParticleDataEntry* particlePtr; |
---|
597 | |
---|
598 | }; |
---|
599 | |
---|
600 | //========================================================================== |
---|
601 | |
---|
602 | // A derived class for f fbar' -> Z0 W+-. (Here pure Z0, unfortunately.) |
---|
603 | |
---|
604 | class Sigma2ffbar2ZW : public Sigma2ffbargmZWgmZW { |
---|
605 | |
---|
606 | public: |
---|
607 | |
---|
608 | // Constructor. |
---|
609 | Sigma2ffbar2ZW() {} |
---|
610 | |
---|
611 | // Initialize process. |
---|
612 | virtual void initProc(); |
---|
613 | |
---|
614 | // Calculate flavour-independent parts of cross section. |
---|
615 | virtual void sigmaKin(); |
---|
616 | |
---|
617 | // Evaluate d(sigmaHat)/d(tHat). |
---|
618 | virtual double sigmaHat(); |
---|
619 | |
---|
620 | // Select flavour, colour and anticolour. |
---|
621 | virtual void setIdColAcol(); |
---|
622 | |
---|
623 | // Evaluate weight for Z0 and W+- decay angles. |
---|
624 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
---|
625 | |
---|
626 | // Info on the subprocess. |
---|
627 | virtual string name() const {return "f fbar' -> Z0 W+- (no gamma*!)";} |
---|
628 | virtual int code() const {return 232;} |
---|
629 | virtual string inFlux() const {return "ffbarChg";} |
---|
630 | virtual int id3Mass() const {return 23;} |
---|
631 | virtual int id4Mass() const {return 24;} |
---|
632 | virtual int resonanceA() const {return 24;} |
---|
633 | |
---|
634 | private: |
---|
635 | |
---|
636 | // Store W+- mass and width, and couplings. |
---|
637 | double mW, widW, mWS, mwWS, sin2thetaW, cos2thetaW, thetaWRat, cotT, |
---|
638 | thetaWpt, thetaWmm, lun, lde, sigma0, openFracPos, openFracNeg; |
---|
639 | |
---|
640 | }; |
---|
641 | |
---|
642 | //========================================================================== |
---|
643 | |
---|
644 | // A derived class for f fbar -> W+ W-. |
---|
645 | |
---|
646 | class Sigma2ffbar2WW : public Sigma2ffbargmZWgmZW { |
---|
647 | |
---|
648 | public: |
---|
649 | |
---|
650 | // Constructor. |
---|
651 | Sigma2ffbar2WW() {} |
---|
652 | |
---|
653 | // Initialize process. |
---|
654 | virtual void initProc(); |
---|
655 | |
---|
656 | // Calculate flavour-independent parts of cross section. |
---|
657 | virtual void sigmaKin(); |
---|
658 | |
---|
659 | // Evaluate d(sigmaHat)/d(tHat). |
---|
660 | virtual double sigmaHat(); |
---|
661 | |
---|
662 | // Select flavour, colour and anticolour. |
---|
663 | virtual void setIdColAcol(); |
---|
664 | |
---|
665 | // Evaluate weight for W+ and W- decay angles. |
---|
666 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
---|
667 | |
---|
668 | // Info on the subprocess. |
---|
669 | virtual string name() const {return "f fbar -> W+ W-";} |
---|
670 | virtual int code() const {return 233;} |
---|
671 | virtual string inFlux() const {return "ffbarSame";} |
---|
672 | virtual int id3Mass() const {return 24;} |
---|
673 | virtual int id4Mass() const {return -24;} |
---|
674 | virtual int resonanceA() const {return 23;} |
---|
675 | |
---|
676 | private: |
---|
677 | |
---|
678 | // Store Z0 mass and width. |
---|
679 | double mZ, widZ, mZS, mwZS, thetaWRat, sigma0, cgg, cgZ, cZZ, cfg, |
---|
680 | cfZ, cff, gSS, gTT, gST, gUU, gSU, openFracPair; |
---|
681 | |
---|
682 | }; |
---|
683 | |
---|
684 | //========================================================================== |
---|
685 | |
---|
686 | // An intermediate class for f fbar -> gamma*/Z0 g/gamma and permutations. |
---|
687 | |
---|
688 | class Sigma2ffbargmZggm : public Sigma2Process { |
---|
689 | |
---|
690 | public: |
---|
691 | |
---|
692 | // Constructor. |
---|
693 | Sigma2ffbargmZggm() {} |
---|
694 | |
---|
695 | // Initialize process. |
---|
696 | virtual void initProc(); |
---|
697 | |
---|
698 | // Evaluate weight for gamma&/Z0 decay angle. |
---|
699 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
---|
700 | |
---|
701 | protected: |
---|
702 | |
---|
703 | // Parameters set at initialization or for each new event. |
---|
704 | int gmZmode; |
---|
705 | double mRes, GammaRes, m2Res, GamMRat, thetaWRat, |
---|
706 | gamSum, intSum, resSum, gamProp, intProp, resProp; |
---|
707 | |
---|
708 | // Evaluate current sum of flavour couplings times phase space. |
---|
709 | void flavSum(); |
---|
710 | |
---|
711 | // Evaluate current propagator terms of cross section. |
---|
712 | void propTerm(); |
---|
713 | |
---|
714 | private: |
---|
715 | |
---|
716 | // Pointer to properties of the particle species, to access decay channels. |
---|
717 | ParticleDataEntry* particlePtr; |
---|
718 | |
---|
719 | }; |
---|
720 | |
---|
721 | //========================================================================== |
---|
722 | |
---|
723 | // A derived class for q qbar -> gamma*/Z0 g. |
---|
724 | |
---|
725 | class Sigma2qqbar2gmZg : public Sigma2ffbargmZggm { |
---|
726 | |
---|
727 | public: |
---|
728 | |
---|
729 | // Constructor. |
---|
730 | Sigma2qqbar2gmZg() {} |
---|
731 | |
---|
732 | // Calculate flavour-independent parts of cross section. |
---|
733 | virtual void sigmaKin(); |
---|
734 | |
---|
735 | // Evaluate d(sigmaHat)/d(tHat). |
---|
736 | virtual double sigmaHat(); |
---|
737 | |
---|
738 | // Select flavour, colour and anticolour. |
---|
739 | virtual void setIdColAcol(); |
---|
740 | |
---|
741 | // Info on the subprocess. |
---|
742 | virtual string name() const {return "q qbar -> gamma*/Z0 g";} |
---|
743 | virtual int code() const {return 241;} |
---|
744 | virtual string inFlux() const {return "qqbarSame";} |
---|
745 | virtual int id3Mass() const {return 23;} |
---|
746 | |
---|
747 | private: |
---|
748 | |
---|
749 | // Values stored for later use. |
---|
750 | double sigma0; |
---|
751 | |
---|
752 | }; |
---|
753 | |
---|
754 | //========================================================================== |
---|
755 | |
---|
756 | // A derived class for q g -> gamma*/Z0 q. |
---|
757 | |
---|
758 | class Sigma2qg2gmZq : public Sigma2ffbargmZggm { |
---|
759 | |
---|
760 | public: |
---|
761 | |
---|
762 | // Constructor. |
---|
763 | Sigma2qg2gmZq() {} |
---|
764 | |
---|
765 | // Calculate flavour-independent parts of cross section. |
---|
766 | virtual void sigmaKin(); |
---|
767 | |
---|
768 | // Evaluate d(sigmaHat)/d(tHat). |
---|
769 | virtual double sigmaHat(); |
---|
770 | |
---|
771 | // Select flavour, colour and anticolour. |
---|
772 | virtual void setIdColAcol(); |
---|
773 | |
---|
774 | // Info on the subprocess. |
---|
775 | virtual string name() const {return "q g-> gamma*/Z0 q";} |
---|
776 | virtual int code() const {return 242;} |
---|
777 | virtual string inFlux() const {return "qg";} |
---|
778 | virtual int id3Mass() const {return 23;} |
---|
779 | |
---|
780 | private: |
---|
781 | |
---|
782 | // Values stored for later use. |
---|
783 | double sigma0; |
---|
784 | |
---|
785 | }; |
---|
786 | |
---|
787 | //========================================================================== |
---|
788 | |
---|
789 | // A derived class for f fbar' -> gamma*/Z0 gamma. |
---|
790 | |
---|
791 | class Sigma2ffbar2gmZgm : public Sigma2ffbargmZggm { |
---|
792 | |
---|
793 | public: |
---|
794 | |
---|
795 | // Constructor. |
---|
796 | Sigma2ffbar2gmZgm() {} |
---|
797 | |
---|
798 | // Calculate flavour-independent parts of cross section. |
---|
799 | virtual void sigmaKin(); |
---|
800 | |
---|
801 | // Evaluate d(sigmaHat)/d(tHat). |
---|
802 | virtual double sigmaHat(); |
---|
803 | |
---|
804 | // Select flavour, colour and anticolour. |
---|
805 | virtual void setIdColAcol(); |
---|
806 | |
---|
807 | // Info on the subprocess. |
---|
808 | virtual string name() const {return "f fbar -> gamma*/Z0 gamma";} |
---|
809 | virtual int code() const {return 243;} |
---|
810 | virtual string inFlux() const {return "ffbarSame";} |
---|
811 | virtual int id3Mass() const {return 23;} |
---|
812 | |
---|
813 | private: |
---|
814 | |
---|
815 | // Values stored for later use. |
---|
816 | double sigma0; |
---|
817 | |
---|
818 | }; |
---|
819 | |
---|
820 | //========================================================================== |
---|
821 | |
---|
822 | // A derived class for f gamma -> gamma*/Z0 f. |
---|
823 | |
---|
824 | class Sigma2fgm2gmZf : public Sigma2ffbargmZggm { |
---|
825 | |
---|
826 | public: |
---|
827 | |
---|
828 | // Constructor. |
---|
829 | Sigma2fgm2gmZf() {} |
---|
830 | |
---|
831 | // Calculate flavour-independent parts of cross section. |
---|
832 | virtual void sigmaKin(); |
---|
833 | |
---|
834 | // Evaluate d(sigmaHat)/d(tHat). |
---|
835 | virtual double sigmaHat(); |
---|
836 | |
---|
837 | // Select flavour, colour and anticolour. |
---|
838 | virtual void setIdColAcol(); |
---|
839 | |
---|
840 | // Info on the subprocess. |
---|
841 | virtual string name() const {return "f gamma -> gamma*/Z0 f";} |
---|
842 | virtual int code() const {return 244;} |
---|
843 | virtual string inFlux() const {return "fgm";} |
---|
844 | virtual int id3Mass() const {return 23;} |
---|
845 | |
---|
846 | private: |
---|
847 | |
---|
848 | // Values stored for later use. |
---|
849 | double sigma0; |
---|
850 | |
---|
851 | }; |
---|
852 | |
---|
853 | //========================================================================== |
---|
854 | |
---|
855 | // An intermediate class for f fbar -> W+- g/gamma and permutations. |
---|
856 | |
---|
857 | class Sigma2ffbarWggm : public Sigma2Process { |
---|
858 | |
---|
859 | public: |
---|
860 | |
---|
861 | // Constructor. |
---|
862 | Sigma2ffbarWggm() {} |
---|
863 | |
---|
864 | // Evaluate weight for gamma&/Z0 decay angle. |
---|
865 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); |
---|
866 | |
---|
867 | private: |
---|
868 | |
---|
869 | }; |
---|
870 | |
---|
871 | //========================================================================== |
---|
872 | |
---|
873 | // A derived class for q qbar' -> W+- g. |
---|
874 | |
---|
875 | class Sigma2qqbar2Wg : public Sigma2ffbarWggm { |
---|
876 | |
---|
877 | public: |
---|
878 | |
---|
879 | // Constructor. |
---|
880 | Sigma2qqbar2Wg() {} |
---|
881 | |
---|
882 | // Initialize process. |
---|
883 | virtual void initProc(); |
---|
884 | |
---|
885 | // Calculate flavour-independent parts of cross section. |
---|
886 | virtual void sigmaKin(); |
---|
887 | |
---|
888 | // Evaluate d(sigmaHat)/d(tHat). |
---|
889 | virtual double sigmaHat(); |
---|
890 | |
---|
891 | // Select flavour, colour and anticolour. |
---|
892 | virtual void setIdColAcol(); |
---|
893 | |
---|
894 | // Info on the subprocess. |
---|
895 | virtual string name() const {return "q qbar' -> W+- g";} |
---|
896 | virtual int code() const {return 251;} |
---|
897 | virtual string inFlux() const {return "ffbarChg";} |
---|
898 | virtual int id3Mass() const {return 24;} |
---|
899 | |
---|
900 | private: |
---|
901 | |
---|
902 | // Values stored for later use. |
---|
903 | double sigma0, openFracPos, openFracNeg; |
---|
904 | |
---|
905 | }; |
---|
906 | |
---|
907 | //========================================================================== |
---|
908 | |
---|
909 | // A derived class for q g -> W+- q'. |
---|
910 | |
---|
911 | class Sigma2qg2Wq : public Sigma2ffbarWggm { |
---|
912 | |
---|
913 | public: |
---|
914 | |
---|
915 | // Constructor. |
---|
916 | Sigma2qg2Wq() {} |
---|
917 | |
---|
918 | // Initialize process. |
---|
919 | virtual void initProc(); |
---|
920 | |
---|
921 | // Calculate flavour-independent parts of cross section. |
---|
922 | virtual void sigmaKin(); |
---|
923 | |
---|
924 | // Evaluate d(sigmaHat)/d(tHat). |
---|
925 | virtual double sigmaHat(); |
---|
926 | |
---|
927 | // Select flavour, colour and anticolour. |
---|
928 | virtual void setIdColAcol(); |
---|
929 | |
---|
930 | // Info on the subprocess. |
---|
931 | virtual string name() const {return "q g-> W+- q'";} |
---|
932 | virtual int code() const {return 252;} |
---|
933 | virtual string inFlux() const {return "qg";} |
---|
934 | virtual int id3Mass() const {return 24;} |
---|
935 | |
---|
936 | private: |
---|
937 | |
---|
938 | // Values stored for later use. |
---|
939 | double sigma0, openFracPos, openFracNeg; |
---|
940 | |
---|
941 | }; |
---|
942 | |
---|
943 | //========================================================================== |
---|
944 | |
---|
945 | // A derived class for f fbar' -> W+- gamma. |
---|
946 | |
---|
947 | class Sigma2ffbar2Wgm : public Sigma2ffbarWggm { |
---|
948 | |
---|
949 | public: |
---|
950 | |
---|
951 | // Constructor. |
---|
952 | Sigma2ffbar2Wgm() {} |
---|
953 | |
---|
954 | // Initialize process. |
---|
955 | virtual void initProc(); |
---|
956 | |
---|
957 | // Calculate flavour-independent parts of cross section. |
---|
958 | virtual void sigmaKin(); |
---|
959 | |
---|
960 | // Evaluate d(sigmaHat)/d(tHat). |
---|
961 | virtual double sigmaHat(); |
---|
962 | |
---|
963 | // Select flavour, colour and anticolour. |
---|
964 | virtual void setIdColAcol(); |
---|
965 | |
---|
966 | // Info on the subprocess. |
---|
967 | virtual string name() const {return "f fbar' -> W+- gamma";} |
---|
968 | virtual int code() const {return 253;} |
---|
969 | virtual string inFlux() const {return "ffbarChg";} |
---|
970 | virtual int id3Mass() const {return 24;} |
---|
971 | |
---|
972 | private: |
---|
973 | |
---|
974 | // Values stored for later use. |
---|
975 | double sigma0, openFracPos, openFracNeg; |
---|
976 | |
---|
977 | }; |
---|
978 | |
---|
979 | //========================================================================== |
---|
980 | |
---|
981 | // A derived class for f gamma -> W+- f'. |
---|
982 | |
---|
983 | class Sigma2fgm2Wf : public Sigma2ffbarWggm { |
---|
984 | |
---|
985 | public: |
---|
986 | |
---|
987 | // Constructor. |
---|
988 | Sigma2fgm2Wf() {} |
---|
989 | |
---|
990 | // Initialize process. |
---|
991 | virtual void initProc(); |
---|
992 | |
---|
993 | // Calculate flavour-independent parts of cross section. |
---|
994 | virtual void sigmaKin(); |
---|
995 | |
---|
996 | // Evaluate d(sigmaHat)/d(tHat). |
---|
997 | virtual double sigmaHat(); |
---|
998 | |
---|
999 | // Select flavour, colour and anticolour. |
---|
1000 | virtual void setIdColAcol(); |
---|
1001 | |
---|
1002 | // Info on the subprocess. |
---|
1003 | virtual string name() const {return "f gamma -> W+- f'";} |
---|
1004 | virtual int code() const {return 254;} |
---|
1005 | virtual string inFlux() const {return "fgm";} |
---|
1006 | virtual int id3Mass() const {return 24;} |
---|
1007 | |
---|
1008 | private: |
---|
1009 | |
---|
1010 | // Values stored for later use. |
---|
1011 | double sigma0, openFracPos, openFracNeg; |
---|
1012 | |
---|
1013 | }; |
---|
1014 | //========================================================================== |
---|
1015 | |
---|
1016 | // A derived class for gamma gamma -> f fbar. |
---|
1017 | |
---|
1018 | class Sigma2gmgm2ffbar : public Sigma2Process { |
---|
1019 | |
---|
1020 | public: |
---|
1021 | |
---|
1022 | // Constructor. |
---|
1023 | Sigma2gmgm2ffbar(int idIn, int codeIn) : idNew(idIn), codeSave(codeIn) {} |
---|
1024 | |
---|
1025 | // Initialize process. |
---|
1026 | virtual void initProc(); |
---|
1027 | |
---|
1028 | // Calculate flavour-independent parts of cross section. |
---|
1029 | virtual void sigmaKin(); |
---|
1030 | |
---|
1031 | // Evaluate d(sigmaHat)/d(tHat). |
---|
1032 | virtual double sigmaHat() {return sigma;} |
---|
1033 | |
---|
1034 | // Select flavour, colour and anticolour. |
---|
1035 | virtual void setIdColAcol(); |
---|
1036 | |
---|
1037 | // Info on the subprocess. |
---|
1038 | virtual string name() const {return nameSave;} |
---|
1039 | virtual int code() const {return codeSave;} |
---|
1040 | virtual string inFlux() const {return "gmgm";} |
---|
1041 | virtual int id3Mass() const {return idMass;} |
---|
1042 | virtual int id4Mass() const {return idMass;} |
---|
1043 | |
---|
1044 | private: |
---|
1045 | |
---|
1046 | // Member variables. |
---|
1047 | int idNew, codeSave, idMass, idNow; |
---|
1048 | string nameSave; |
---|
1049 | double ef4, s34Avg, sigTU, sigma, openFracPair; |
---|
1050 | |
---|
1051 | }; |
---|
1052 | |
---|
1053 | //========================================================================== |
---|
1054 | |
---|
1055 | } // end namespace Pythia8 |
---|
1056 | |
---|
1057 | #endif // Pythia8_SigmaEW_H |
---|