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[PWGHF] Bugfixes of correlated background processing in 3-prong decays #13609

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Merged
mfaggin merged 2 commits into from
Oct 31, 2025
Merged

[PWGHF] Bugfixes of correlated background processing in 3-prong decays #13609

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97c8866
add Xic->PKPi into swapping calculation when matchCorrelatedBackgroun…
lubynets Oct 30, 2025
4158b47
include Lc reflection into corrBkg; adjust naming kepp[Signal,Bkg,Cor…
lubynets Oct 30, 2025
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4 changes: 2 additions & 2 deletions PWGHF/TableProducer/candidateCreator3Prong.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1126,8 +1126,8 @@ struct HfCandidateCreator3ProngExpressions {
if (indexRec > -1) {
flagChannelMain = sign * channelMain;

/// swapping for D+, Ds->Kpipi and Lc->pKpi
if (std::abs(flagChannelMain) == DecayChannelMain::DplusToPiKK || std::abs(flagChannelMain) == DecayChannelMain::DsToPiKK || std::abs(flagChannelMain) == DecayChannelMain::LcToPKPi) {
/// swapping for D+, Ds->Kpipi; Lc, Xic->pKpi
if (std::abs(flagChannelMain) == DecayChannelMain::DplusToPiKK || std::abs(flagChannelMain) == DecayChannelMain::DsToPiKK || std::abs(flagChannelMain) == DecayChannelMain::LcToPKPi || std::abs(flagChannelMain) == DecayChannelMain::XicToPKPi) {
if (arrayDaughters[0].has_mcParticle()) {
swapping = static_cast<int8_t>(std::abs(arrayDaughters[0].mcParticle().pdgCode()) == kPiPlus);
}
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10 changes: 5 additions & 5 deletions PWGHF/TableProducer/treeCreatorLcToPKPi.cxx
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Expand Up @@ -401,8 +401,8 @@ struct HfTreeCreatorLcToPKPi {
Configurable<bool> fillCollIdTable{"fillCollIdTable", false, "Fill a single-column table with collision index"};
Configurable<bool> fillCandidateMcTable{"fillCandidateMcTable", false, "Switch to fill a table with MC particles matched to candidates"};
Configurable<bool> applyMl{"applyMl", false, "Whether ML was used in candidateSelectorLc"};
Configurable<bool> keepOnlySignalMc{"keepOnlySignalMc", false, "Fill MC tree only with signal candidates"};
Configurable<bool> keepOnlyBkg{"keepOnlyBkg", false, "Fill MC tree only with background candidates"};
Configurable<bool> keepSignalMc{"keepSignalMc", false, "Fill MC tree with signal candidates"};
Configurable<bool> keepBkgMc{"keepBkgMc", false, "Fill MC tree with background candidates"};
Configurable<bool> keepCorrBkgMC{"keepCorrBkgMC", false, "Flag to keep correlated background sources (Λc+ -> p K− π+ π0, p π− π+, p K− K+ and other charm hadrons)"};
Configurable<double> downSampleBkgFactor{"downSampleBkgFactor", 1., "Fraction of candidates to store in the tree"};
Configurable<float> downSampleBkgPtMax{"downSampleBkgPtMax", 100.f, "Max. pt for background downsampling"};
Expand Down Expand Up @@ -940,11 +940,11 @@ struct HfTreeCreatorLcToPKPi {
const int sigbgstatus = determineSignalBgStatus(candidate, candFlag);
const bool isMcCandidateSignal = (sigbgstatus == Prompt) || (sigbgstatus == NonPrompt);
const bool passSelection = functionSelection >= selectionFlagLc;
const bool keepAll = !keepOnlySignalMc && !keepOnlyBkg && !keepCorrBkgMC;
const bool keepAll = !keepSignalMc && !keepBkgMc && !keepCorrBkgMC;
const int flag = candidate.flagMcMatchRec();
const bool isCorrBkg = (std::abs(flag) != 0 && std::abs(flag) != o2::hf_decay::hf_cand_3prong::DecayChannelMain::LcToPKPi);
const bool isCorrBkg = (std::abs(flag) != 0 && std::abs(flag) != o2::hf_decay::hf_cand_3prong::DecayChannelMain::LcToPKPi) || sigbgstatus == WrongOrder;
const bool notSkippedBkg = isMcCandidateSignal || candidate.pt() > downSampleBkgPtMax || pseudoRndm < downSampleBkgFactor;
if (passSelection && notSkippedBkg && (keepAll || (keepOnlySignalMc && isMcCandidateSignal) || (keepOnlyBkg && !isMcCandidateSignal) || (keepCorrBkgMC && isCorrBkg))) {
if (passSelection && notSkippedBkg && (keepAll || (keepSignalMc && isMcCandidateSignal) || (keepBkgMc && !isMcCandidateSignal) || (keepCorrBkgMC && isCorrBkg))) {
if (fillCandidateLiteTable) {
fillLiteTable<IsMc>(candidate, candidateMlScore, candFlag);
} else {
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