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[PWGEM] emcalPhotonMcTask: Add three new TruthClasses for Bremsstrahl… #17343

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mhemmer-cern merged 1 commit into from
Aug 6, 2026
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[PWGEM] emcalPhotonMcTask: Add three new TruthClasses for Bremsstrahl… #17343

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13 changes: 12 additions & 1 deletion PWGEM/PhotonMeson/DataModel/ConversionMl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@

namespace convtag
{
DECLARE_SOA_COLUMN(PMEvent, pmevent, int); //! index column to the pmevent

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[name/o2-column] 

Use UpperCamelCase for names of O2 columns and matching lowerCamelCase names for their getters.
DECLARE_SOA_COLUMN(Minv, minv, float); //! invariant mass of the pair
DECLARE_SOA_COLUMN(HarmonicET, harmonicET, float); //! ET1 * ET2 / (ET1 + ET2) in GeV
DECLARE_SOA_COLUMN(DeltaEta, deltaEta, float); //! difference in eta of the two clusters
Expand All @@ -39,15 +39,26 @@
DECLARE_SOA_COLUMN(Time2, time2, float); //! time of second cluster in ns
DECLARE_SOA_COLUMN(NCells1, nCells1, uint8_t); //! NCells of first cluster
DECLARE_SOA_COLUMN(NCells2, nCells2, uint8_t); //! NCells of second cluster
DECLARE_SOA_COLUMN(TruthLabel, truthLabel, int8_t); //! truth label for ML training (0 == conversion, 1 == from Pi0, 2 == background)
DECLARE_SOA_COLUMN(TruthLabel, truthLabel, int8_t); //! truth label for ML training -- see TruthClass enum for the mapping
DECLARE_SOA_COLUMN(CentOrMult, centOrMult, float); //! centrality or multiplicity value of the collision
DECLARE_SOA_COLUMN(Purity1, purity1, float); // leading-contributor amplitude fraction, cluster 1
DECLARE_SOA_COLUMN(Purity2, purity2, float); // leading-contributor amplitude fraction, cluster 2

} // namespace convtag
DECLARE_SOA_TABLE(ConvTagCandidates, "AOD", "CONVTAGCAND",
convtag::PMEvent,
convtag::Minv, convtag::HarmonicET, convtag::DeltaEta, convtag::DeltaPhi, convtag::Phiv,
convtag::E1, convtag::E2, convtag::M021, convtag::M022,
convtag::Time1, convtag::Time2, convtag::NCells1, convtag::NCells2,
convtag::TruthLabel, convtag::CentOrMult);

DECLARE_SOA_TABLE_VERSIONED(ConvTagCandidates_001, "AOD", "CONVTAGCAND", 1,
convtag::PMEvent,
convtag::Minv, convtag::HarmonicET, convtag::DeltaEta, convtag::DeltaPhi, convtag::Phiv,
convtag::E1, convtag::E2, convtag::M021, convtag::M022,
convtag::Time1, convtag::Time2, convtag::NCells1, convtag::NCells2, convtag::Purity1, convtag::Purity2,
convtag::TruthLabel, convtag::CentOrMult);

} // namespace o2::aod

#endif // PWGEM_PHOTONMESON_DATAMODEL_CONVERSIONML_H_
50 changes: 34 additions & 16 deletions PWGEM/PhotonMeson/Tasks/emcalPhotonMcTask.cxx
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Expand Up @@ -94,16 +94,19 @@ enum class TruthClass {
PhotonElectronSamePi0, // 4: photon + electron cluster, same Pi0
PhotonElectronDiffPi0, // 5: photon + electron cluster, different Pi0s
PhotonElectronOnePi0, // 6: photon + electron cluster, only one from a Pi0
PhotonElectronBS, // 7: photon + electron cluster, from Bremsstrahlung
BSPhotonElectron, // 7: photon + electron cluster, from Bremsstrahlung

ElectronPairSamePi0, // 8: e+e cluster pair, same Pi0 (conversion and/or Dalitz)
ElectronPairDiffPi0, // 9: e+e cluster pair, different Pi0s
ElectronPairOnePi0, // 10: e+e cluster pair, only one from a Pi0

SplitPhotonCluster, // 11: one photon producing two clusters
SplitLeptonCluster, // 12: one lepton producing two clusters
SplitPhotonCluster, // 11: one photon producing two clusters
SplitLeptonCluster, // 12: one lepton producing two clusters
PhotonBSPhotonPair, // 13: photon + photon from Bremsstrahlung
ElectronBSPhotonPair, // 14: one cluster from Bremsstrahlung and one electron cluster except case BSPhotonElectron
BSPhotonPair, // 15: both photons from Bremsstrahlung

Background, // 13: else / uncorrelated
Background, // 16: else / uncorrelated

NClasses
};
Expand Down Expand Up @@ -132,15 +135,17 @@ struct ClusterMcInfo {
bool isFromBremsstrahlung = false;
int convMotherId = -1;
int photonId = -1;
float purity = 0;
};

template <o2::soa::is_iterator TGroup, o2::soa::is_iterator TIter, o2::soa::is_table McParticles>
ClusterMcInfo classifyCluster(const TGroup& g, TIter& mcCluster, TIter& mcClusterLooper, TIter& mcClusterLooper2, McParticles const& mcParticles)
{
ClusterMcInfo info;
mcCluster.setCursor(g.emmcparticleIds()[0]);
info.isFromBremsstrahlung = isFromBremsstrahlung(mcCluster, mcClusterLooper);
info.isFromBremsstrahlung = isFromBremsstrahlung(mcCluster, mcClusterLooper); // particle has to be a photon and it has to have a e+ or e- as mother!
float leadingAmplitude = g.amplitude()[0];
info.purity = leadingAmplitude;
if (std::abs(mcCluster.pdgCode()) == PDG_t::kElectron) {
info.isLepton = true;
info.convMotherId = getMotherIndexFromChain(mcCluster, mcClusterLooper, PDG_t::kGamma);
Expand Down Expand Up @@ -178,18 +183,18 @@ struct EmcalPhotonMcTask {

static constexpr std::array<const char*, static_cast<size_t>(TruthClass::NClasses)> kTruthClassNames = {
"Conversion", "PhotonPairSamePi0", "PhotonPairDiffPi0", "PhotonPairOnePi0",
"PhotonElectronSamePi0", "PhotonElectronDiffPi0", "PhotonElectronOnePi0", "PhotonElectronBS",
"PhotonElectronSamePi0", "PhotonElectronDiffPi0", "PhotonElectronOnePi0", "BSPhotonElectron",
"ElectronPairSamePi0", "ElectronPairDiffPi0", "ElectronPairOnePi0",
"SplitPhotonCluster", "SplitLeptonCluster", "Background"};

Produces<aod::ConvTagCandidates> convTagCandidates;
Produces<aod::ConvTagCandidates_001> convTagCandidates;

Configurable<std::string> ccdbUrl{"ccdbUrl", "http://alice-ccdb.cern.ch", "url of the ccdb repository"};
Configurable<std::string> grpPath{"grpPath", "GLO/GRP/GRP", "Path of the grp file"};
Configurable<std::string> grpmagPath{"grpmagPath", "GLO/Config/GRPMagField", "CCDB path of the GRPMagField object"};
Configurable<bool> skipGRPOquery{"skipGRPOquery", true, "skip grpo query"};
Configurable<bool> writeTable{"writeTable", true, "write table for ML."};
Configurable<std::vector<int>> classPrescale{"classPrescale", {1, 1, 700, 25, 1, 350, 15, 1, 1, 35, 2, 1, 1, 1000}, "prescale factor per TruthClass, indexed 0..10 matching the enum order"};
Configurable<std::vector<int>> classPrescale{"classPrescale", {1, 1, 700, 25, 1, 350, 15, 1, 1, 35, 2, 1, 1, 1, 1, 1, 1000}, "prescale factor per TruthClass, indexed 0..10 matching the enum order"};
Configurable<uint32_t> bkgPrescaleSeed{"bkgPrescaleSeed", 42, "seed for the background-prescale RNG"};

// configurable axis
Expand Down Expand Up @@ -334,6 +339,7 @@ struct EmcalPhotonMcTask {
o2::aod::pwgem::photonmeson::utils::eventhistogram::addEventHistograms(&registry);

const AxisSpec thnAxisERec{thnConfigAxisPt, "#it{E}_{Rec} (GeV)"};
const AxisSpec thnAxisPtRec{thnConfigAxisPt, "#it{p}_{T} (GeV/#it{c})"};
const AxisSpec thnAxisInvMass{thnConfigAxisInvMass, "#it{M}_{#gamma#gamma} (GeV/#it{c}^{2})"};

const AxisSpec thnAxisrConvRec{100, 0, 500, "#it{R}_{rec}"};
Expand All @@ -354,7 +360,7 @@ struct EmcalPhotonMcTask {
thnAxisCentOrMult = {thnConfigAxisMult, "FT0C Multiplicity"};
}

auto hTruthLabel = registry.add<TH1>("hTruthLabel", "Truth label distribution;;Counts", HistType::kTH1D, {{static_cast<int>(TruthClass::NClasses), -0.5, static_cast<double>(TruthClass::NClasses) - 0.5}});
auto hTruthLabel = registry.add<TH2>("hTruthLabel", "Truth label distribution;;Counts", HistType::kTH2D, {{static_cast<int>(TruthClass::NClasses), -0.5, static_cast<double>(TruthClass::NClasses) - 0.5}, thnAxisPtRec});

// set bin labels once at init, so histogram is human-readable without decoding the enum
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::Conversion) + 1, "Conversion");
Expand All @@ -364,12 +370,15 @@ struct EmcalPhotonMcTask {
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::PhotonElectronSamePi0) + 1, "PhotonElectronSamePi0");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::PhotonElectronDiffPi0) + 1, "PhotonElectronDiffPi0");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::PhotonElectronOnePi0) + 1, "PhotonElectronOnePi0");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::PhotonElectronBS) + 1, "PhotonElectronBS");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::BSPhotonElectron) + 1, "BSPhotonElectron");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::ElectronPairSamePi0) + 1, "ElectronPairSamePi0");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::ElectronPairDiffPi0) + 1, "ElectronPairDiffPi0");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::ElectronPairOnePi0) + 1, "ElectronPairOnePi0");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::SplitPhotonCluster) + 1, "SplitPhotonCluster");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::SplitLeptonCluster) + 1, "SplitLeptonCluster");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::PhotonBSPhotonPair) + 1, "PhotonBSPhotonPair");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::ElectronBSPhotonPair) + 1, "ElectronBSPhotonPair");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::BSPhotonPair) + 1, "BSPhotonPair");
hTruthLabel->GetXaxis()->SetBinLabel(static_cast<int>(TruthClass::Background) + 1, "Background");

auto hPi0BothResolvedLost = registry.add<TH1>("EMCal/hPi0BothResolvedLost", "Confusion matrix for conversion tagging", HistType::kTH1D, {{2, -0.5, 1.5}});
Expand Down Expand Up @@ -582,7 +591,7 @@ struct EmcalPhotonMcTask {
bool areConversionLegs = false;
bool areSplitPhotonCluster = false;
bool areSplitLeptonCluster = false;
bool arePhotonElectronBS = false;
bool areBSPhotonElectron = false;

auto c1 = classifyCluster(g1, mcCluster1, mcClusterLooper, mcClusterLooper2, mcParticles);
auto c2 = classifyCluster(g2, mcCluster2, mcClusterLooper, mcClusterLooper2, mcParticles);
Expand All @@ -599,6 +608,9 @@ struct EmcalPhotonMcTask {
}
}

const bool isAnyBSPhoton = c1.isFromBremsstrahlung || c2.isFromBremsstrahlung;
const bool areBSPhotons = c1.isFromBremsstrahlung && c2.isFromBremsstrahlung;

// if they are not a split cluster check for proper conversion pair
if (!isSameDominantParticle && c1.isFromConv && c2.isFromConv && c1.convMotherId == c2.convMotherId) {
emcFlagsFromTrueConversion.set(g1.globalIndex());
Expand All @@ -616,7 +628,7 @@ struct EmcalPhotonMcTask {
// bremsstrahlung: one side is a photon born from the other side's lepton lineage
const bool photonIsBS = (c1.isPhoton && c1.isFromBremsstrahlung) || (c2.isPhoton && c2.isFromBremsstrahlung);
if (photonIsBS && ((c1.isLepton && c2.isPhoton) || (c2.isLepton && c1.isPhoton))) {
arePhotonElectronBS = true;
areBSPhotonElectron = true;
} else {
areFromSamePi0 = true;
emcFlagsFromTrueMesonSameGamma.set(g1.globalIndex());
Expand All @@ -637,8 +649,14 @@ struct EmcalPhotonMcTask {
bTruthLabel = static_cast<int8_t>(TruthClass::SplitLeptonCluster);
} else if (areConversionLegs) {
bTruthLabel = static_cast<int8_t>(TruthClass::Conversion);
} else if (arePhotonElectronBS) {
bTruthLabel = static_cast<int8_t>(TruthClass::PhotonElectronBS);
} else if (areBSPhotonElectron) {
bTruthLabel = static_cast<int8_t>(TruthClass::BSPhotonElectron);
} else if (areBSPhotons && (c1.isFromPi0 || c2.isFromPi0)) {
bTruthLabel = static_cast<int8_t>(TruthClass::BSPhotonPair);
} else if (isAnyBSPhoton && (c1.isFromPi0 || c2.isFromPi0) && ((c1.isPhoton && c2.isLepton) || (c2.isPhoton && c1.isLepton))) {
bTruthLabel = static_cast<int8_t>(TruthClass::ElectronBSPhotonPair);
} else if (isAnyBSPhoton && (c1.isFromPi0 || c2.isFromPi0) && (c1.isPhoton && c2.isPhoton)) {
bTruthLabel = static_cast<int8_t>(TruthClass::PhotonBSPhotonPair);
} else if (areFromSamePi0) {
if ((c1.isLepton && c2.isPhoton) || (c2.isLepton && c1.isPhoton)) {
bTruthLabel = static_cast<int8_t>(TruthClass::PhotonElectronSamePi0);
Expand All @@ -665,13 +683,13 @@ struct EmcalPhotonMcTask {
}
}

registry.fill(HIST("hTruthLabel"), bTruthLabel);
registry.fill(HIST("hTruthLabel"), bTruthLabel, vMeson.Pt());

// final tree values plus filling
const int prescale = classPrescale.value[static_cast<uint>(bTruthLabel)];
const bool keepThisRow = (prescale <= 1) || (std::uniform_int_distribution<int>(0, prescale - 1)(mRandGen) == 0);
if (writeTable.value && keepThisRow) {
convTagCandidates(collision.globalIndex(), vMeson.M(), harmonicET, deltaEta, deltaPhi, phiV, g1.e(), g2.e(), g1.m02(), g2.m02(), g1.time(), g2.time(), g1.nCells(), g2.nCells(), bTruthLabel, centOrMult);
convTagCandidates(collision.globalIndex(), vMeson.M(), harmonicET, deltaEta, deltaPhi, phiV, g1.e(), g2.e(), g1.m02(), g2.m02(), g1.time(), g2.time(), g1.nCells(), g2.nCells(), c1.purity, c2.purity, bTruthLabel, centOrMult);
}
} // pair loop
} // collision loop
Expand Down
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