1 | // ProcessLevel.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 main class for process-level event generation. |
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7 | // ProcessLevel: administrates the selection of "hard" process. |
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8 | |
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9 | #ifndef Pythia8_ProcessLevel_H |
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10 | #define Pythia8_ProcessLevel_H |
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11 | |
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12 | #include "Basics.h" |
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13 | #include "BeamParticle.h" |
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14 | #include "Event.h" |
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15 | #include "Info.h" |
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16 | #include "ParticleData.h" |
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17 | #include "PartonDistributions.h" |
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18 | #include "ProcessContainer.h" |
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19 | #include "PythiaStdlib.h" |
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20 | #include "ResonanceDecays.h" |
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21 | #include "Settings.h" |
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22 | #include "SigmaTotal.h" |
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23 | #include "SusyCouplings.h" |
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24 | #include "SusyLesHouches.h" |
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25 | #include "StandardModel.h" |
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26 | #include "UserHooks.h" |
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27 | |
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28 | namespace Pythia8 { |
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29 | |
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30 | //========================================================================== |
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31 | |
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32 | // The ProcessLevel class contains the top-level routines to generate |
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33 | // the characteristic "hard" process of an event. |
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34 | |
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35 | class ProcessLevel { |
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36 | |
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37 | public: |
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38 | |
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39 | // Constructor. |
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40 | ProcessLevel() : iLHACont(-1) {} |
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41 | |
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42 | // Destructor to delete processes in containers. |
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43 | ~ProcessLevel(); |
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44 | |
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45 | // Initialization. |
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46 | bool init( Info* infoPtrIn, Settings& settings, |
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47 | ParticleData* particleDataPtrIn, Rndm* rndmPtrIn, |
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48 | BeamParticle* beamAPtrIn, BeamParticle* beamBPtrIn, |
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49 | Couplings* couplingsPtrIn, SigmaTotal* sigmaTotPtrIn, bool doLHAin, |
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50 | SusyLesHouches* slhaPtrIn, UserHooks* userHooksPtrIn, |
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51 | vector<SigmaProcess*>& sigmaPtrs, ostream& os = cout); |
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52 | |
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53 | // Store or replace Les Houches pointer. |
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54 | void setLHAPtr( LHAup* lhaUpPtrIn) {lhaUpPtr = lhaUpPtrIn; |
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55 | if (iLHACont >= 0) containerPtrs[iLHACont]->setLHAPtr(lhaUpPtr);} |
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56 | |
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57 | // Generate the next "hard" process. |
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58 | bool next( Event& process); |
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59 | |
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60 | // Special case: LHA input of resonance decay only. |
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61 | bool nextLHAdec( Event& process); |
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62 | |
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63 | // Accumulate and update statistics (after possible user veto). |
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64 | void accumulate(); |
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65 | |
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66 | // Print statistics on cross sections and number of events. |
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67 | void statistics(bool reset = false, ostream& os = cout); |
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68 | |
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69 | // Reset statistics. |
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70 | void resetStatistics(); |
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71 | |
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72 | // Add any junctions to the process event record list. |
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73 | void findJunctions( Event& junEvent); |
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74 | |
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75 | // Initialize and call resonance decays separately. |
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76 | void initDecays( Info* infoPtrIn, ParticleData* particleDataPtrIn, |
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77 | Rndm* rndmPtrIn, LHAup* lhaUpPtrIn) { infoPtr = infoPtrIn; |
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78 | resonanceDecays.init( infoPtrIn, particleDataPtrIn, rndmPtrIn); |
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79 | containerLHAdec.setLHAPtr(lhaUpPtrIn, particleDataPtrIn); } |
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80 | bool nextDecays( Event& process) { return resonanceDecays.next( process);} |
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81 | |
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82 | private: |
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83 | |
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84 | // Constants: could only be changed in the code itself. |
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85 | static const int MAXLOOP; |
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86 | |
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87 | // Generic info for process generation. |
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88 | bool doSecondHard, doSameCuts, allHardSame, noneHardSame, |
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89 | someHardSame, cutsAgree, cutsOverlap, doResDecays; |
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90 | int nImpact, startColTag; |
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91 | double mHatMin1, mHatMax1, pTHatMin1, pTHatMax1, mHatMin2, mHatMax2, |
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92 | pTHatMin2, pTHatMax2, sigmaND, sumImpactFac, sum2ImpactFac; |
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93 | |
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94 | // Vector of containers of internally-generated processes. |
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95 | vector<ProcessContainer*> containerPtrs; |
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96 | int iContainer, iLHACont; |
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97 | double sigmaMaxSum; |
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98 | |
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99 | // Ditto for optional choice of a second hard process. |
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100 | vector<ProcessContainer*> container2Ptrs; |
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101 | int i2Container; |
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102 | double sigma2MaxSum; |
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103 | |
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104 | // Single half-dummy container for LHA input of resonance decay only. |
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105 | ProcessContainer containerLHAdec; |
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106 | |
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107 | // Pointer to various information on the generation. |
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108 | Info* infoPtr; |
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109 | |
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110 | // Pointer to the particle data table. |
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111 | ParticleData* particleDataPtr; |
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112 | |
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113 | // Pointer to the random number generator. |
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114 | Rndm* rndmPtr; |
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115 | |
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116 | // Pointers to the two incoming beams. |
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117 | BeamParticle* beamAPtr; |
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118 | BeamParticle* beamBPtr; |
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119 | |
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120 | // Pointer to Standard Model couplings, including alphaS and alphaEM. |
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121 | Couplings* couplingsPtr; |
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122 | |
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123 | // Pointer to SigmaTotal object needed to handle soft QCD processes. |
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124 | SigmaTotal* sigmaTotPtr; |
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125 | |
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126 | // Pointer to SusyLesHouches object for interface to SUSY spectra. |
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127 | SusyLesHouches* slhaPtr; |
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128 | |
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129 | // Pointer to userHooks object for user interaction with program. |
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130 | UserHooks* userHooksPtr; |
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131 | |
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132 | // Pointer to LHAup for generating external events. |
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133 | LHAup* lhaUpPtr; |
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134 | |
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135 | // Initialization of some SLHA blocks. |
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136 | void initSLHA(); |
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137 | |
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138 | // ResonanceDecay object does sequential resonance decays. |
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139 | ResonanceDecays resonanceDecays; |
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140 | |
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141 | // Generate the next event with one interaction. |
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142 | bool nextOne( Event& process); |
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143 | |
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144 | // Generate the next event with two hard interactions. |
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145 | bool nextTwo( Event& process); |
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146 | |
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147 | // Append the second to the first process list. |
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148 | void combineProcessRecords( Event& process, Event& process2); |
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149 | |
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150 | // Check that colours match up. |
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151 | bool checkColours( Event& process); |
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152 | |
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153 | // Print statistics when two hard processes allowed. |
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154 | void statistics2(bool reset, ostream& os = cout); |
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155 | |
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156 | // Statistics for Les Houches event classification. |
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157 | vector<int> codeLHA, nEvtLHA; |
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158 | |
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159 | }; |
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160 | |
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161 | //========================================================================== |
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162 | |
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163 | } // end namespace Pythia8 |
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164 | |
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165 | #endif // Pythia8_ProcessLevel_H |
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