1 | // HiddenValleyFragmentation.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 | // This file contains the classes for Hidden-Valley fragmentation. |
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7 | |
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8 | #ifndef Pythia8_HiddenValleyFragmentation_H |
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9 | #define Pythia8_HiddenValleyFragmentation_H |
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10 | |
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11 | #include "Basics.h" |
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12 | #include "Event.h" |
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13 | #include "FragmentationFlavZpT.h" |
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14 | #include "FragmentationSystems.h" |
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15 | #include "Info.h" |
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16 | #include "MiniStringFragmentation.h" |
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17 | #include "ParticleData.h" |
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18 | #include "PythiaStdlib.h" |
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19 | #include "Settings.h" |
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20 | #include "StringFragmentation.h" |
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21 | |
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22 | namespace Pythia8 { |
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23 | |
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24 | //========================================================================== |
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25 | |
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26 | // The HVStringFlav class is used to select HV-quark and HV-hadron flavours. |
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27 | |
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28 | class HVStringFlav : public StringFlav { |
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29 | |
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30 | public: |
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31 | |
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32 | // Constructor. |
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33 | HVStringFlav() {} |
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34 | |
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35 | // Destructor. |
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36 | ~HVStringFlav() {} |
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37 | |
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38 | // Initialize data members. |
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39 | void init(Settings& settings, Rndm* rndmPtrIn); |
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40 | |
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41 | // Pick a new flavour (including diquarks) given an incoming one. |
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42 | FlavContainer pick(FlavContainer& flavOld); |
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43 | |
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44 | // Combine two flavours (including diquarks) to produce a hadron. |
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45 | int combine(FlavContainer& flav1, FlavContainer& flav2); |
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46 | |
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47 | private: |
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48 | |
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49 | // Initialization data, to be read from Settings. |
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50 | int nFlav; |
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51 | double probVector; |
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52 | |
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53 | }; |
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54 | |
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55 | //========================================================================== |
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56 | |
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57 | // The HVStringPT class is used to select select HV transverse momenta. |
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58 | |
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59 | class HVStringPT : public StringPT { |
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60 | |
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61 | public: |
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62 | |
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63 | // Constructor. |
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64 | HVStringPT() {} |
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65 | |
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66 | // Destructor. |
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67 | ~HVStringPT() {} |
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68 | |
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69 | // Initialize data members. |
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70 | void init(Settings& settings, ParticleData& particleData, Rndm* rndmPtrIn); |
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71 | |
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72 | }; |
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73 | |
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74 | //========================================================================== |
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75 | |
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76 | // The HVStringZ class is used to sample the HV fragmentation function f(z). |
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77 | |
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78 | class HVStringZ : public StringZ { |
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79 | |
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80 | public: |
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81 | |
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82 | // Constructor. |
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83 | HVStringZ() {} |
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84 | |
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85 | // Destructor. |
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86 | ~HVStringZ() {} |
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87 | |
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88 | // Initialize data members. |
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89 | void init(Settings& settings, ParticleData& particleData, Rndm* rndmPtrIn); |
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90 | |
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91 | // Fragmentation function: top-level to determine parameters. |
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92 | double zFrag( int idOld, int idNew = 0, double mT2 = 1.); |
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93 | |
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94 | // Parameters for stopping in the middle; for now hardcoded. |
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95 | virtual double stopMass() {return 1.5 * mhvMeson;} |
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96 | virtual double stopNewFlav() {return 2.0;} |
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97 | virtual double stopSmear() {return 0.2;} |
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98 | |
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99 | private: |
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100 | |
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101 | // Initialization data, to be read from Settings and ParticleData. |
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102 | double mqv2, bmqv2, rFactqv, mhvMeson; |
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103 | |
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104 | }; |
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105 | |
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106 | //========================================================================== |
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107 | |
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108 | // The HiddenValleyFragmentation class contains the routines |
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109 | // to fragment a Hidden Valley partonic system. |
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110 | |
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111 | class HiddenValleyFragmentation { |
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112 | |
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113 | public: |
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114 | |
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115 | // Constructor. |
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116 | HiddenValleyFragmentation() : hvFlavSelPtr(NULL), hvPTSelPtr(NULL), |
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117 | hvZSelPtr(NULL) {} |
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118 | |
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119 | // Destructor. |
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120 | ~HiddenValleyFragmentation() { if (doHVfrag) { |
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121 | if (hvZSelPtr) delete hvZSelPtr; if (hvPTSelPtr) delete hvPTSelPtr; |
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122 | if (hvFlavSelPtr) delete hvFlavSelPtr;} } |
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123 | |
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124 | // Initialize and save pointers. |
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125 | bool init(Info* infoPtrIn, Settings& settings, |
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126 | ParticleData* particleDataPtrIn, Rndm* rndmPtrIn); |
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127 | |
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128 | // Do the fragmentation: driver routine. |
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129 | bool fragment(Event& event); |
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130 | |
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131 | private: |
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132 | |
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133 | // Pointer to various information on the generation. |
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134 | Info* infoPtr; |
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135 | |
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136 | // Pointer to the particle data table. |
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137 | ParticleData* particleDataPtr; |
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138 | |
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139 | // Pointer to the random number generator. |
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140 | Rndm* rndmPtr; |
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141 | |
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142 | // Data mambers. |
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143 | bool doHVfrag; |
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144 | int nFlav, hvOldSize, hvNewSize; |
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145 | double mhvMeson, mSys; |
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146 | vector<int> ihvParton; |
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147 | |
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148 | // Configuration of colour-singlet systems. |
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149 | ColConfig hvColConfig; |
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150 | |
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151 | // Temporary event record for the Hidden Valley system. |
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152 | Event hvEvent; |
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153 | |
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154 | // The generator class for Hidden Valley string fragmentation. |
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155 | StringFragmentation hvStringFrag; |
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156 | |
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157 | // The generator class for special low-mass HV string fragmentation. |
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158 | MiniStringFragmentation hvMinistringFrag; |
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159 | |
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160 | // Pointers to classes for flavour, pT and z generation in HV sector. |
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161 | StringFlav* hvFlavSelPtr; |
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162 | StringPT* hvPTSelPtr; |
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163 | StringZ* hvZSelPtr; |
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164 | |
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165 | // Extract HV-particles from event to hvEvent. Assign HV-colours. |
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166 | bool extractHVevent(Event& event); |
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167 | |
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168 | // Collapse of low-mass system to one HV-meson. |
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169 | bool collapseToMeson(); |
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170 | |
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171 | // Insert HV particles from hvEvent to event. |
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172 | bool insertHVevent(Event& event); |
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173 | |
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174 | }; |
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175 | |
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176 | //========================================================================== |
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177 | |
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178 | } // end namespace Pythia8 |
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179 | |
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180 | #endif // Pythia8_HiddenValleyFragmentation_H |
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