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| 1 | +#include "Pythia8/Pythia.h" |
| 2 | +#include "Pythia8/HeavyIons.h" |
| 3 | +#include "FairGenerator.h" |
| 4 | +#include "FairPrimaryGenerator.h" |
| 5 | +#include "Generators/GeneratorPythia8.h" |
| 6 | +#include "TRandom3.h" |
| 7 | +#include "TParticlePDG.h" |
| 8 | +#include "TDatabasePDG.h" |
| 9 | + |
| 10 | +#include <map> |
| 11 | +#include <unordered_set> |
| 12 | + |
| 13 | +using namespace Pythia8; |
| 14 | + |
| 15 | +class GeneratorPythia8HFLeptonpp : public o2::eventgen::GeneratorPythia8 |
| 16 | +{ |
| 17 | +public: |
| 18 | + /// default constructor |
| 19 | + GeneratorPythia8HFLeptonpp() = default; |
| 20 | + |
| 21 | + /// constructor |
| 22 | + GeneratorPythia8HFLeptonpp(TString configsignal, int quarkPdg = 4, int lInputExternalID = 0) |
| 23 | + { |
| 24 | + |
| 25 | + lGeneratedEvents = 0; |
| 26 | + lExternalID = lInputExternalID; |
| 27 | + mQuarkPdg = quarkPdg; |
| 28 | + |
| 29 | + auto seed = (gRandom->TRandom::GetSeed() % 900000000); |
| 30 | + |
| 31 | + int offset = (int)(gRandom->Uniform(1)); // create offset to mitigate edge effects due to small number of events per job |
| 32 | + lGeneratedEvents += offset; |
| 33 | + |
| 34 | + cout << "Initalizing PYTHIA object used to generate signal events..." << endl; |
| 35 | + TString pathconfigSignal = gSystem->ExpandPathName(configsignal.Data()); |
| 36 | + pythiaObjectSignal.readFile(pathconfigSignal.Data()); |
| 37 | + pythiaObjectSignal.readString("Random:setSeed on"); |
| 38 | + pythiaObjectSignal.readString("Random:seed " + std::to_string(seed)); |
| 39 | + pythiaObjectSignal.readString("Beams:eCM = 5360.0"); |
| 40 | + pythiaObjectSignal.init(); |
| 41 | + cout << "Initalization of signal event is complete" << endl; |
| 42 | + |
| 43 | + // flag the generators using type |
| 44 | + // addCocktailConstituent(type, "interesting"); |
| 45 | + // addCocktailConstitent(0, "minbias"); |
| 46 | + // Add Sub generators |
| 47 | + addSubGenerator(1, "charm lepton"); |
| 48 | + addSubGenerator(2, "beauty forced decay"); |
| 49 | + addSubGenerator(3, "beauty no foced decay"); |
| 50 | + } |
| 51 | + |
| 52 | + /// Destructor |
| 53 | + ~GeneratorPythia8HFLeptonpp() = default; |
| 54 | + |
| 55 | + void addTriggerOnDaughter(int nb, int pdg) |
| 56 | + { |
| 57 | + mNbDaughter = nb; |
| 58 | + mPdgDaughter = pdg; |
| 59 | + }; |
| 60 | + void setQuarkRapidity(float yMin, float yMax) |
| 61 | + { |
| 62 | + mQuarkRapidityMin = yMin; |
| 63 | + mQuarkRapidityMax = yMax; |
| 64 | + }; |
| 65 | + void setDaughterRapidity(float yMin, float yMax) |
| 66 | + { |
| 67 | + mDaughterRapidityMin = yMin; |
| 68 | + mDaughterRapidityMax = yMax; |
| 69 | + }; |
| 70 | + |
| 71 | +protected: |
| 72 | + //__________________________________________________________________ |
| 73 | + Bool_t generateEvent() override |
| 74 | + { |
| 75 | + /// reset event |
| 76 | + mPythia.event.reset(); |
| 77 | + |
| 78 | + // Generate event of interest |
| 79 | + Bool_t lGenerationOK = kFALSE; |
| 80 | + while (!lGenerationOK) { |
| 81 | + if (pythiaObjectSignal.next()) { |
| 82 | + lGenerationOK = selectEvent(pythiaObjectSignal.event); |
| 83 | + } |
| 84 | + } |
| 85 | + mPythia.event = pythiaObjectSignal.event; |
| 86 | + notifySubGenerator(lExternalID); |
| 87 | + |
| 88 | + lGeneratedEvents++; |
| 89 | + // mPythia.next(); |
| 90 | + |
| 91 | + return true; |
| 92 | + } |
| 93 | + |
| 94 | + bool selectEvent(const Pythia8::Event& event) |
| 95 | + { |
| 96 | + bool isGoodAtPartonLevel = false, isGoodAtDaughterLevel = (mPdgDaughter != 0) ? false : true; |
| 97 | + int nbDaughter = 0; |
| 98 | + for (auto iPart{0}; iPart < event.size(); ++iPart) { |
| 99 | + // search for Q-Qbar mother with at least one Q in rapidity window |
| 100 | + if (!isGoodAtPartonLevel) { |
| 101 | + auto daughterList = event[iPart].daughterList(); |
| 102 | + bool hasQ = false, hasQbar = false, atSelectedY = false; |
| 103 | + for (auto iDau : daughterList) { |
| 104 | + if (event[iDau].id() == mQuarkPdg) { |
| 105 | + hasQ = true; |
| 106 | + } |
| 107 | + if (event[iDau].id() == -mQuarkPdg) { |
| 108 | + hasQbar = true; |
| 109 | + } |
| 110 | + if ((std::abs(event[iDau].id()) == mQuarkPdg) && (event[iDau].y() > mQuarkRapidityMin) && (event[iDau].y() < mQuarkRapidityMax)) |
| 111 | + atSelectedY = true; |
| 112 | + } |
| 113 | + if (hasQ && hasQbar && atSelectedY) { |
| 114 | + isGoodAtPartonLevel = true; |
| 115 | + } |
| 116 | + } |
| 117 | + // search for mNbDaughter daughters of type mPdgDaughter in rapidity window |
| 118 | + if (!isGoodAtDaughterLevel) { |
| 119 | + int id = std::abs(event[iPart].id()); |
| 120 | + float rap = event[iPart].y(); |
| 121 | + if (id == mPdgDaughter) { |
| 122 | + int motherindexa = event[iPart].mother1(); |
| 123 | + if (motherindexa > 0) { |
| 124 | + int idmother = std::abs(event[motherindexa].id()); |
| 125 | + if (int(std::abs(idmother) / 100.) == 4 || int(std::abs(idmother) / 1000.) == 4 || int(std::abs(idmother) / 100.) == 5 || int(std::abs(idmother) / 1000.) == 5) { |
| 126 | + if (rap > mDaughterRapidityMin && rap < mDaughterRapidityMax) { |
| 127 | + nbDaughter++; |
| 128 | + if (nbDaughter >= mNbDaughter) isGoodAtDaughterLevel = true; |
| 129 | + } |
| 130 | + } |
| 131 | + } |
| 132 | + } |
| 133 | + } |
| 134 | + // we send the trigger |
| 135 | + if (isGoodAtPartonLevel && isGoodAtDaughterLevel) { |
| 136 | + return true; |
| 137 | + } |
| 138 | + } |
| 139 | + return false; |
| 140 | + }; |
| 141 | + |
| 142 | +private: |
| 143 | + // Interface to override import particles |
| 144 | + Pythia8::Event mOutputEvent; |
| 145 | + |
| 146 | + // Properties of selection |
| 147 | + int mQuarkPdg; |
| 148 | + float mQuarkRapidityMin; |
| 149 | + float mQuarkRapidityMax; |
| 150 | + int mPdgDaughter; |
| 151 | + int mNbDaughter; |
| 152 | + float mDaughterRapidityMin; |
| 153 | + float mDaughterRapidityMax; |
| 154 | + |
| 155 | + Long64_t lGeneratedEvents; |
| 156 | + // ID for different generators |
| 157 | + int lExternalID; |
| 158 | + |
| 159 | + // Base event generators |
| 160 | + Pythia8::Pythia pythiaObjectSignal; ///Signal collision generator |
| 161 | +}; |
| 162 | + |
| 163 | +// Predefined generators: |
| 164 | + |
| 165 | +// Charm-enriched forced decay |
| 166 | +FairGenerator* GeneratorPythia8CharmLepton(int inputExternalID, int pdgLepton, float yMinQ = -1.5, float yMaxQ = 1.5, float yMinL = -1, float yMaxL = 1) |
| 167 | +{ |
| 168 | + auto myGen = new GeneratorPythia8HFLeptonpp("${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGEM/pythia8/generator/pythia8_pp_cr2_forceddecayscharm.cfg", 4, inputExternalID); |
| 169 | + auto seed = (gRandom->TRandom::GetSeed() % 900000000); |
| 170 | + myGen->readString("Random:setSeed on"); |
| 171 | + myGen->readString("Random:seed " + std::to_string(seed)); |
| 172 | + myGen->setQuarkRapidity(yMinQ, yMaxQ); |
| 173 | + myGen->addTriggerOnDaughter(2, pdgLepton); |
| 174 | + myGen->setDaughterRapidity(yMinL, yMaxL); |
| 175 | + return myGen; |
| 176 | +} |
| 177 | + |
| 178 | +// Beauty-enriched forced decay |
| 179 | +FairGenerator* GeneratorPythia8BeautyForcedDecays(int inputExternalID, int pdgLepton, float yMinQ = -1.5, float yMaxQ = 1.5, float yMinL = -1, float yMaxL = 1) |
| 180 | +{ |
| 181 | + auto myGen = new GeneratorPythia8HFLeptonpp("${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGEM/pythia8/generator/pythia8_bbbar_forceddecayscharmbeauty.cfg", 5, inputExternalID); |
| 182 | + auto seed = (gRandom->TRandom::GetSeed() % 900000000); |
| 183 | + myGen->readString("Random:setSeed on"); |
| 184 | + myGen->readString("Random:seed " + std::to_string(seed)); |
| 185 | + myGen->setQuarkRapidity(yMinQ, yMaxQ); |
| 186 | + myGen->addTriggerOnDaughter(2, pdgLepton); |
| 187 | + myGen->setDaughterRapidity(yMinL, yMaxL); |
| 188 | + return myGen; |
| 189 | +} |
| 190 | + |
| 191 | +// Beauty-enriched no forced decay |
| 192 | +FairGenerator* GeneratorPythia8BeautyNoForcedDecays(int inputExternalID, int pdgLepton, float yMinQ = -1.5, float yMaxQ = 1.5, float yMinL = -1, float yMaxL = 1) |
| 193 | +{ |
| 194 | + auto myGen = new GeneratorPythia8HFLeptonpp("${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGEM/pythia8/generator/pythia8_bbbar.cfg", 5, inputExternalID); |
| 195 | + auto seed = (gRandom->TRandom::GetSeed() % 900000000); |
| 196 | + myGen->readString("Random:setSeed on"); |
| 197 | + myGen->readString("Random:seed " + std::to_string(seed)); |
| 198 | + myGen->setQuarkRapidity(yMinQ, yMaxQ); |
| 199 | + myGen->addTriggerOnDaughter(2, pdgLepton); |
| 200 | + myGen->setDaughterRapidity(yMinL, yMaxL); |
| 201 | + return myGen; |
| 202 | +} |
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