1 | // SigmaLeptoquark.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 leptoquark-process differential cross sections. |
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7 | // Contains classes derived from SigmaProcess via Sigma(1/2)Process. |
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8 | // Note: since leptoquark assumed scalar no need for decay-angles routines. |
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9 | |
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10 | #ifndef Pythia8_SigmaLeptoquark_H |
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11 | #define Pythia8_SigmaLeptoquark_H |
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12 | |
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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 | // A derived class for q l -> LQ (leptoquark). |
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20 | |
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21 | class Sigma1ql2LeptoQuark : public Sigma1Process { |
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22 | |
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23 | public: |
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24 | |
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25 | // Constructor. |
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26 | Sigma1ql2LeptoQuark() {} |
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27 | |
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28 | // Initialize process. |
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29 | virtual void initProc(); |
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30 | |
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31 | // Calculate flavour-independent parts of cross section. |
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32 | virtual void sigmaKin(); |
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33 | |
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34 | // Evaluate sigmaHat(sHat). |
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35 | virtual double sigmaHat(); |
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36 | |
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37 | // Select flavour, colour and anticolour. |
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38 | virtual void setIdColAcol(); |
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39 | |
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40 | // Info on the subprocess. |
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41 | virtual string name() const {return "q l -> LQ (leptoquark)";} |
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42 | virtual int code() const {return 3201;} |
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43 | virtual string inFlux() const {return "ff";} |
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44 | virtual int resonanceA() const {return 42;} |
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45 | |
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46 | private: |
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47 | |
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48 | // Parameters set at initialization or for current kinematics. |
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49 | int idQuark, idLepton; |
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50 | double mRes, GammaRes, m2Res, GamMRat, kCoup, widthIn, sigBW; |
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51 | |
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52 | // Pointer to properties of the particle species, to access decay channel. |
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53 | ParticleDataEntry* LQPtr; |
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54 | |
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55 | }; |
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56 | |
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57 | //========================================================================== |
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58 | |
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59 | // A derived class for q g -> LQ l (leptoquark). |
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60 | |
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61 | class Sigma2qg2LeptoQuarkl : public Sigma2Process { |
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62 | |
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63 | public: |
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64 | |
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65 | // Constructor. |
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66 | Sigma2qg2LeptoQuarkl() {} |
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67 | |
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68 | // Initialize process. |
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69 | virtual void initProc(); |
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70 | |
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71 | // Calculate flavour-independent parts of cross section. |
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72 | virtual void sigmaKin(); |
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73 | |
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74 | // Evaluate sigmaHat(sHat). |
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75 | virtual double sigmaHat(); |
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76 | |
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77 | // Select flavour, colour and anticolour. |
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78 | virtual void setIdColAcol(); |
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79 | |
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80 | // Info on the subprocess. |
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81 | virtual string name() const {return "q g -> LQ l (leptoquark)";} |
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82 | virtual int code() const {return 3202;} |
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83 | virtual string inFlux() const {return "qg";} |
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84 | virtual int id3Mass() const {return 42;} |
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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 current kinematics. |
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89 | int idQuark, idLepton; |
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90 | double mRes, GammaRes, m2Res, GamMRat, kCoup, openFracPos, openFracNeg, |
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91 | sigma0; |
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92 | |
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93 | }; |
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94 | |
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95 | //========================================================================== |
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96 | |
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97 | // A derived class for g g -> LQ LQbar (leptoquark). |
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98 | |
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99 | class Sigma2gg2LQLQbar : public Sigma2Process { |
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100 | |
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101 | public: |
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102 | |
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103 | // Constructor. |
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104 | Sigma2gg2LQLQbar() {} |
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105 | |
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106 | // Initialize process. |
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107 | virtual void initProc(); |
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108 | |
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109 | // Calculate flavour-independent parts of cross section. |
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110 | virtual void sigmaKin(); |
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111 | |
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112 | // Evaluate sigmaHat(sHat). |
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113 | virtual double sigmaHat() {return sigma;} |
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114 | |
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115 | // Select flavour, colour and anticolour. |
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116 | virtual void setIdColAcol(); |
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117 | |
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118 | // Info on the subprocess. |
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119 | virtual string name() const {return "g g -> LQ LQbar (leptoquark)";} |
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120 | virtual int code() const {return 3203;} |
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121 | virtual string inFlux() const {return "gg";} |
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122 | virtual int id3Mass() const {return 42;} |
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123 | virtual int id4Mass() const {return 42;} |
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124 | |
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125 | private: |
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126 | |
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127 | // Parameters set at initialization or for current kinematics. |
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128 | double mRes, GammaRes, m2Res, GamMRat, openFrac, sigma; |
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129 | |
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130 | }; |
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131 | |
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132 | //========================================================================== |
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133 | |
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134 | // A derived class for q qbar -> LQ LQbar (leptoquark). |
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135 | |
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136 | class Sigma2qqbar2LQLQbar : public Sigma2Process { |
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137 | |
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138 | public: |
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139 | |
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140 | // Constructor. |
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141 | Sigma2qqbar2LQLQbar() {} |
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142 | |
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143 | // Initialize process. |
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144 | virtual void initProc(); |
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145 | |
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146 | // Calculate flavour-independent parts of cross section. |
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147 | virtual void sigmaKin(); |
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148 | |
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149 | // Evaluate sigmaHat(sHat). |
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150 | virtual double sigmaHat() { |
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151 | return (abs(id1) == idQuark) ? sigmaSame : sigmaDiff;} |
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152 | |
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153 | // Select flavour, colour and anticolour. |
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154 | virtual void setIdColAcol(); |
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155 | |
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156 | // Info on the subprocess. |
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157 | virtual string name() const {return "q qbar -> LQ LQbar (leptoquark)";} |
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158 | virtual int code() const {return 3204;} |
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159 | virtual string inFlux() const {return "qqbarSame";} |
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160 | virtual int id3Mass() const {return 42;} |
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161 | virtual int id4Mass() const {return 42;} |
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162 | |
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163 | private: |
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164 | |
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165 | // Parameters set at initialization or for current kinematics. |
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166 | int idQuark; |
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167 | double mRes, GammaRes, m2Res, GamMRat, kCoup, openFrac, sigmaDiff, |
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168 | sigmaSame; |
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169 | |
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170 | }; |
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171 | |
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172 | //========================================================================== |
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173 | |
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174 | } // end namespace Pythia8 |
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175 | |
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176 | #endif // Pythia8_SigmaLeptoquark_H |
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