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| 1 | +int External() { |
| 2 | + std::string path{"o2sim_Kine.root"}; |
| 3 | + |
| 4 | + int pdgCDeuteron{2010010020}; |
| 5 | + int checkNumberOfCDeuteronPerEvent{10}; |
| 6 | + float checkLifetimeCDeuteron{0.05f}; |
| 7 | + std::map<int, std::vector<std::vector<int>>> checkDecays{ |
| 8 | + {2010010020, {{-321, 211, 1000010020}}} // c-deuteron -> K- + pi+ + deuteron |
| 9 | + }; |
| 10 | + float checkFracCDeuteronFromBeauty{0.25}; |
| 11 | + |
| 12 | + TFile file(path.c_str(), "READ"); |
| 13 | + if (file.IsZombie()) { |
| 14 | + std::cerr << "Cannot open ROOT file " << path << "\n"; |
| 15 | + return 1; |
| 16 | + } |
| 17 | + |
| 18 | + auto tree = (TTree *)file.Get("o2sim"); |
| 19 | + std::vector<o2::MCTrack> *tracks{}; |
| 20 | + tree->SetBranchAddress("MCTrack", &tracks); |
| 21 | + |
| 22 | + int nCDeuteron{}, nCDeuteronGoodDecay{}, nCDeuteronFromBeauty{}; |
| 23 | + std::array<float, 2> averageLifetimeCDeuteron{0.f, 0.f}; // prompt and non-prompt |
| 24 | + float massCDeuteron = 3.226f; |
| 25 | + auto nEvents = tree->GetEntries(); |
| 26 | + |
| 27 | + for (int i = 0; i < nEvents; i++) { |
| 28 | + tree->GetEntry(i); |
| 29 | + |
| 30 | + for (auto &track : *tracks) { |
| 31 | + auto pdg = track.GetPdgCode(); |
| 32 | + auto absPdg = std::abs(pdg); |
| 33 | + // std::cout << "Event " << i << ": found particle with PDG " << pdg << std::endl; |
| 34 | + |
| 35 | + if (absPdg == pdgCDeuteron) { // found signal |
| 36 | + nCDeuteron++; // count signal PDG |
| 37 | + |
| 38 | + // std::cout << "Event " << i << ": found c-deuteron with PDG " << pdg << std::endl; |
| 39 | + |
| 40 | + std::vector<int> pdgsDecay{}; |
| 41 | + std::vector<int> pdgsDecayAntiPart{}; |
| 42 | + if (track.getFirstDaughterTrackId() >= 0 && track.getLastDaughterTrackId() >= 0) { |
| 43 | + for (int j{track.getFirstDaughterTrackId()}; j <= track.getLastDaughterTrackId(); ++j) { |
| 44 | + // std::cout << "Fetching daughter track with ID " << j << std::endl; |
| 45 | + auto pdgDau = tracks->at(j).GetPdgCode(); |
| 46 | + // std::cout << "PDG of daughter track " << j << ": " << pdgDau << std::endl; |
| 47 | + pdgsDecay.push_back(pdgDau); |
| 48 | + if (pdgDau != 333 && pdgDau != 111) { // phi and pi0 are antiparticles of themselves |
| 49 | + pdgsDecayAntiPart.push_back(-pdgDau); |
| 50 | + } else { |
| 51 | + pdgsDecayAntiPart.push_back(pdgDau); |
| 52 | + } |
| 53 | + } |
| 54 | + } |
| 55 | + // std::cout << "Daughters fetched" << std::endl; |
| 56 | + |
| 57 | + auto mother = track.getMotherTrackId(); |
| 58 | + bool isFromBeauty{false}; |
| 59 | + if (mother >= 0 && std::abs(tracks->at(mother).GetPdgCode()) == 5122) { // check if c-deuteron comes from Lb |
| 60 | + nCDeuteronFromBeauty++; |
| 61 | + isFromBeauty = true; |
| 62 | + } |
| 63 | + |
| 64 | + auto dauTrack = tracks->at(track.getFirstDaughterTrackId()); |
| 65 | + float decayLength = std::sqrt((track.GetStartVertexCoordinatesX() - dauTrack.GetStartVertexCoordinatesX()) * (track.GetStartVertexCoordinatesX() - dauTrack.GetStartVertexCoordinatesX()) + (track.GetStartVertexCoordinatesY() - dauTrack.GetStartVertexCoordinatesY()) * (track.GetStartVertexCoordinatesY() - dauTrack.GetStartVertexCoordinatesY()) + (track.GetStartVertexCoordinatesZ() - dauTrack.GetStartVertexCoordinatesZ()) * (track.GetStartVertexCoordinatesZ() - dauTrack.GetStartVertexCoordinatesZ())); |
| 66 | + if (!isFromBeauty) { |
| 67 | + averageLifetimeCDeuteron[0] += decayLength * massCDeuteron / track.GetP(); |
| 68 | + } else { |
| 69 | + averageLifetimeCDeuteron[1] += decayLength * massCDeuteron / track.GetP(); |
| 70 | + } |
| 71 | + |
| 72 | + std::sort(pdgsDecay.begin(), pdgsDecay.end()); |
| 73 | + std::sort(pdgsDecayAntiPart.begin(), pdgsDecayAntiPart.end()); |
| 74 | + |
| 75 | + for (auto &decay : checkDecays[std::abs(pdg)]) { |
| 76 | + if (pdgsDecay == decay || pdgsDecayAntiPart == decay) { |
| 77 | + nCDeuteronGoodDecay++; |
| 78 | + break; |
| 79 | + } |
| 80 | + } |
| 81 | + // std::cout << "Daughters checked " << std::endl; |
| 82 | + } |
| 83 | + } |
| 84 | + } |
| 85 | + |
| 86 | + averageLifetimeCDeuteron[0] /= nCDeuteron - nCDeuteronFromBeauty; |
| 87 | + averageLifetimeCDeuteron[1] /= nCDeuteronFromBeauty; |
| 88 | + |
| 89 | + std::cout << "--------------------------------\n"; |
| 90 | + std::cout << "# Events: " << nEvents << "\n"; |
| 91 | + std::cout <<"# signal c-deuteron: " << nCDeuteron << "\n"; |
| 92 | + std::cout <<"# signal c-deuteron decaying in the correct channel: " << nCDeuteronGoodDecay << "\n"; |
| 93 | + std::cout <<"# signal c-deuteron from beauty: " << nCDeuteronFromBeauty << "\n"; |
| 94 | + std::cout <<"Average lifetime of c-deuteron (prompt): " << averageLifetimeCDeuteron[0] << " (cm) \n"; |
| 95 | + std::cout <<"Average lifetime of c-deuteron (non-prompt): " << averageLifetimeCDeuteron[1] << " (cm) \n"; |
| 96 | + |
| 97 | + float numberOfCDeuteronPerEvent = float(nCDeuteron) / nEvents; |
| 98 | + float fracCDeuteronGoodDecay = float(nCDeuteronGoodDecay) / nCDeuteron; |
| 99 | + float fracCDeuteronFromBeauty = float(nCDeuteronFromBeauty) / nCDeuteron; |
| 100 | + |
| 101 | + if (std::abs(numberOfCDeuteronPerEvent - checkNumberOfCDeuteronPerEvent) / numberOfCDeuteronPerEvent > 0.05) { // we put some tolerance since the number of generated events is small |
| 102 | + std::cerr << "Number of C-deuterons per event " << numberOfCDeuteronPerEvent << " different than expected " << checkNumberOfCDeuteronPerEvent << "\n"; |
| 103 | + return 1; |
| 104 | + } |
| 105 | + |
| 106 | + if (fracCDeuteronGoodDecay < 0.95) { // we put some tolerance since the number of generated events is small |
| 107 | + std::cerr << "Fraction of signals decaying into the correct channel " << fracCDeuteronGoodDecay << " lower than expected\n"; |
| 108 | + return 1; |
| 109 | + } |
| 110 | + |
| 111 | + if (std::abs(fracCDeuteronFromBeauty - checkFracCDeuteronFromBeauty) / checkFracCDeuteronFromBeauty > 0.10) { // we put some tolerance since the number of generated events is small |
| 112 | + std::cerr << "Fraction of signals from beauty " << fracCDeuteronFromBeauty << " different than expected " << checkFracCDeuteronFromBeauty << "\n"; |
| 113 | + return 1; |
| 114 | + } |
| 115 | + |
| 116 | + if (std::abs(averageLifetimeCDeuteron[0] - checkLifetimeCDeuteron) / checkLifetimeCDeuteron > 0.10) { // we put some tolerance since the number of generated events is small |
| 117 | + std::cerr << "Lifetime for prompt c-deuteron " << averageLifetimeCDeuteron[0] << " different than expected " << checkLifetimeCDeuteron << "\n"; |
| 118 | + return 1; |
| 119 | + } |
| 120 | + |
| 121 | + if (std::abs(averageLifetimeCDeuteron[1] - checkLifetimeCDeuteron) / checkLifetimeCDeuteron > 0.10) { // we put some tolerance since the number of generated events is small |
| 122 | + std::cerr << "Lifetime for non-prompt c-deuteron " << averageLifetimeCDeuteron[1] << " different than expected " << checkLifetimeCDeuteron << "\n"; |
| 123 | + return 1; |
| 124 | + } |
| 125 | + |
| 126 | + return 0; |
| 127 | +} |
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