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Francesco Mazzaschi
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Add generator for LambdaB --> nuclei
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‎MC/config/PWGHF/ini/GeneratorHFTrigger_LambdaBToNuclei.ini‎

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### The external generator derives from GeneratorPythia8.
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[GeneratorExternal]
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fileName=${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGHF/external/generator/generator_pythia8_hfhadron_to_nuclei.C
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funcName=generateHFHadToNuclei(3, {5122}, {1000020030, 1000010030}, true, 0.5)
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[GeneratorPythia8]
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config=${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGHF/pythia8/generator/pythia8_lambdab_with_decays_Mode2.cfg

‎MC/config/PWGHF/ini/tests/GeneratorHFTrigger_LambdaBToNuclei.C‎

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int External()
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{
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std::string path{"o2sim_Kine.root"};
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std::vector<int> checkPdgHadron{5122}; // Lambda_b
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std::vector<int> nucleiDauPdg{1000020030, 1000010030}; // 3He, 3H
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TFile file(path.c_str(), "READ");
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if (file.IsZombie())
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{
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std::cerr << "Cannot open ROOT file " << path << "\n";
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return 1;
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}
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auto tree = (TTree *)file.Get("o2sim");
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std::vector<o2::MCTrack> *tracks{};
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tree->SetBranchAddress("MCTrack", &tracks);
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int nSignals{}, nSignalGoodDecay{};
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auto nEvents = tree->GetEntries();
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for (int i = 0; i < nEvents; i++)
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{
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tree->GetEntry(i);
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for (auto &track : *tracks)
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{
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auto pdg = track.GetPdgCode();
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if (std::find(checkPdgHadron.begin(), checkPdgHadron.end(), std::abs(pdg)) != checkPdgHadron.end()) // found signal
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{
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// count signal PDG
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if(std::abs(track.GetRapidity()) > 1.5) continue; // skip if outside rapidity window
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nSignals++;
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for (int j{track.getFirstDaughterTrackId()}; j <= track.getLastDaughterTrackId(); ++j)
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{
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auto pdgDau = tracks->at(j).GetPdgCode();
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if (std::find(nucleiDauPdg.begin(), nucleiDauPdg.end(), std::abs(pdgDau)) != nucleiDauPdg.end())
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{
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nSignalGoodDecay++;
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}
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}
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}
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}
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}
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std::cout << "--------------------------------\n";
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std::cout << "# Events: " << nEvents << "\n";
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std::cout <<"# signal hadrons: " << nSignals << "\n";
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std::cout <<"# signal hadrons decaying into nuclei: " << nSignalGoodDecay << "\n";
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float fracForcedDecays = float(nSignalGoodDecay) / nSignals;
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if (fracForcedDecays < 0.8) // we put some tolerance (lambdaB in MB events do not coalesce)
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{
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std::cerr << "Fraction of signals decaying into nuclei: " << fracForcedDecays << ", lower than expected\n";
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return 1;
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}
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return 0;
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}

‎MC/config/PWGHF/pythia8/generator/pythia8_lambdab_with_decays_Mode2.cfg‎

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### authors: Fabrizio Grosa (fabrizio.grosa@cern.ch)
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### Cristina Terrevoli (cristina.terrevoli@cern.ch)
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### Fabio Catalano (fabio.catalano@cern.ch)
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### last update: November 2023
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### beams
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Beams:idA 2212 # proton
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Beams:idB 2212 # proton
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Beams:eCM 13600. # GeV
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### processes
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SoftQCD:inelastic on # all inelastic processes
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### decays
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ParticleDecays:limitTau0 on
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ParticleDecays:tau0Max 10.
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### switching on Pythia Mode2
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ColourReconnection:mode 1
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ColourReconnection:allowDoubleJunRem off
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ColourReconnection:m0 0.3
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ColourReconnection:allowJunctions on
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ColourReconnection:junctionCorrection 1.20
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ColourReconnection:timeDilationMode 2
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ColourReconnection:timeDilationPar 0.18
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StringPT:sigma 0.335
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StringZ:aLund 0.36
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StringZ:bLund 0.56
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StringFlav:probQQtoQ 0.078
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StringFlav:ProbStoUD 0.2
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StringFlav:probQQ1toQQ0join 0.0275,0.0275,0.0275,0.0275
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MultiPartonInteractions:pT0Ref 2.15
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BeamRemnants:remnantMode 1
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BeamRemnants:saturation 5
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# Correct decay lengths (wrong in PYTHIA8 decay table)
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# Lb
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5122:tau0 = 0.4390
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# Xic0
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4132:tau0 = 0.0455
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# OmegaC
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4332:tau0 = 0.0803
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## Lb decay modes
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5122:onMode = off
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5122:oneChannel = 1 9.03e-05 0 2212 2212 -2212 -2212 2112
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5122:addChannel = 1 0.00181 0 2212 2212 -2212 -2212 2112 111
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5122:addChannel = 1 0.0181 0 2212 2212 -2212 -2212 2112 111 111
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5122:addChannel = 1 0.0271 0 2212 2212 -2212 -2212 2112 211 -211
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5122:addChannel = 1 0.0181 0 2212 2212 -2212 -2212 2112 211 211 -211 -211
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5122:addChannel = 1 0.181 0 2212 2212 -2212 -2212 2112 211 -211 111
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5122:addChannel = 1 0.199 0 2212 2212 -2212 -2212 2112 211 -211 111 111
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5122:addChannel = 1 0.0271 0 2212 2212 -2212 -2212 2112 211 211 -211 -211 111
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5122:addChannel = 1 0.00452 0 2212 2212 -2212 -2212 2112 211 111
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5122:addChannel = 1 0.0361 0 2212 2212 2112 -2212 -2112 -211 111
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5122:addChannel = 1 0.0452 0 2212 2212 2112 -2212 -2112 -211 111 111
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5122:addChannel = 1 0.0542 0 2212 2212 2112 -2212 -2112 -211 -211 211
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5122:addChannel = 1 0.361 0 2212 2212 2112 -2212 -2112 -211 -211 211 111
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5122:addChannel = 1 0.0271 0 2212 2212 2112 -2212 -2112 -211 -211 211 111 111
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5122:onIfMatch = 2212 2212 2212 2212 2112
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5122:onIfMatch = 2212 2212 2212 2212 2112 111
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5122:onIfMatch = 2212 2212 2212 2212 2112 111 111
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5122:onIfMatch = 2212 2212 2212 2212 2112 211 211
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5122:onIfMatch = 2212 2212 2212 2212 2112 211 211 211 211
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5122:onIfMatch = 2212 2212 2212 2212 2112 211 211 111
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5122:onIfMatch = 2212 2212 2212 2212 2112 211 211 111 111
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5122:onIfMatch = 2212 2212 2212 2212 2112 211 211 211 211 111
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5122:onIfMatch = 2212 2212 2212 2212 2112 211 111
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5122:onIfMatch = 2212 2212 2112 2212 2112 211 111
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5122:onIfMatch = 2212 2212 2112 2212 2112 211 111 111
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5122:onIfMatch = 2212 2212 2112 2212 2112 211 211 211
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5122:onIfMatch = 2212 2212 2112 2212 2112 211 211 211 111
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5122:onIfMatch = 2212 2212 2112 2212 2112 211 211 211 111 111

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