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[PWGLF] Add BestCentrality MC events histos #15492

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Merged
romainschotter merged 6 commits into from
Mar 23, 2026
+22 −13
Merged

[PWGLF] Add BestCentrality MC events histos #15492

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24151df
Change event filling logic
yakparo Feb 13, 2026
85013e3
Formatting
yakparo Feb 13, 2026
7e92e8a
Linter fix
yakparo Feb 14, 2026
961ebdd
Merge branch 'AliceO2Group:master' into master
yakparo Mar 23, 2026
d1f112c
Add best cent to MC
yakparo Mar 23, 2026
84b02cf
Formatting
yakparo Mar 23, 2026
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35 changes: 22 additions & 13 deletions PWGLF/Tasks/Strangeness/strangeCascTrack.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -855,6 +855,7 @@ struct StrangeCascTrack {
histos.add("MC/EvRec/EvCounter", "Event Counter", kTH1D, {{1, 0, 1}});
histos.add("MC/EvRec/Mult", "Event charged multiplicty (gen events with reco>=1)", kTH1D, {{1600, 0, 3200}});
histos.add("MC/EvRec/MultCent", "Gen multiplicity vs reco centrality", kTH2D, {{100, 0, 100}, {1600, 0, 3200}});
histos.add("MC/EvRec/Cent", "FT0 Centality", kTH1D, {axesConfig.axisMult});
histos.add("MC/EvRec/Xi", "Xi", kTH2D, {axesConfig.axisPt, axesConfig.axisMult}); // generated Xis in reco>=1
histos.add("MC/EvRec/PrimaryXi", "Xi primaries", kTH2D, {axesConfig.axisPt, axesConfig.axisMult}); // generated primary Xis in reco>=1
histos.add("MC/EvRec/PrimaryXiRapidity", "Xi primaries in |y|", kTH2D, {axesConfig.axisPt, axesConfig.axisMult}); // generated primary Xis in selected rapidity range in reco>=1
Expand Down Expand Up @@ -1048,6 +1049,8 @@ struct StrangeCascTrack {
// look at reco>= 1 for corrections
auto slicedRecColls = recColls.sliceBy(perMcCollision, genColl.globalIndex());
bool recoCounter = false;
int biggestNContribs = -1;
float bestCentrality = 100.5;
for (auto const& recColl : slicedRecColls) {
if (!isValidEvent(recColl, false))
continue; // from this point on - only gen events (and cascades from such events) that were reconstructed
Expand All @@ -1059,42 +1062,48 @@ struct StrangeCascTrack {
histos.fill(HIST("MC/EvRec/Mult"), genMult);
recoCounter = true;
}
// fill multiplicity-centrality distribution
double recoMult = (doProcessIons) ? recColl.centFT0C() : recColl.centFT0M();
histos.fill(HIST("MC/EvRec/MultCent"), recoMult, genMult);
if (biggestNContribs < recColl.multPVTotalContributors()) {
biggestNContribs = recColl.multPVTotalContributors();
bestCentrality = (doProcessIons) ? recColl.centFT0C() : recColl.centFT0M();
}
// look at generated cascades within reconstructed events
for (auto const& casc : slicedGenCascs) {
if (casc.straMCCollisionId() != genCollId)
continue; // check for cascades belonging to the correct reco collision
double cascPt = casc.ptMC();
if (isValidPDG(casc, "Xi"))
histos.fill(HIST("MC/EvRec/Xi"), cascPt, recoMult);
histos.fill(HIST("MC/EvRec/Xi"), cascPt, bestCentrality);
if (isValidPDG(casc, "Omega"))
histos.fill(HIST("MC/EvRec/Omega"), cascPt, recoMult);
histos.fill(HIST("MC/EvRec/Omega"), cascPt, bestCentrality);
if (casc.isPhysicalPrimary()) {
if (isValidPDG(casc, "Xi")) {
histos.fill(HIST("MC/EvRec/PrimaryXi"), cascPt, recoMult);
histos.fill(HIST("MC/EvRec/PrimaryXi"), cascPt, bestCentrality);
if (std::abs(casc.rapidityMC(0)) < selCuts.cutRapidity) {
histos.fill(HIST("MC/EvRec/PrimaryXiRapidity"), cascPt, recoMult);
histos.fill(HIST("MC/EvRec/PrimaryXiRapidity"), cascPt, bestCentrality);
if (casc.pdgCode() == PDG_t::kXiMinus)
histos.fill(HIST("MC/EvRec/PrimaryXiMinusRapidity"), cascPt, recoMult);
histos.fill(HIST("MC/EvRec/PrimaryXiMinusRapidity"), cascPt, bestCentrality);
if (casc.pdgCode() == PDG_t::kXiPlusBar)
histos.fill(HIST("MC/EvRec/PrimaryXiPlusRapidity"), cascPt, recoMult);
histos.fill(HIST("MC/EvRec/PrimaryXiPlusRapidity"), cascPt, bestCentrality);
}
}
if (isValidPDG(casc, "Omega")) {
histos.fill(HIST("MC/EvRec/PrimaryOmega"), cascPt, recoMult);
histos.fill(HIST("MC/EvRec/PrimaryOmega"), cascPt, bestCentrality);
if (std::abs(casc.rapidityMC(2)) < selCuts.cutRapidity) {
histos.fill(HIST("MC/EvRec/PrimaryOmegaRapidity"), cascPt, recoMult);
histos.fill(HIST("MC/EvRec/PrimaryOmegaRapidity"), cascPt, bestCentrality);
if (casc.pdgCode() == PDG_t::kOmegaMinus)
histos.fill(HIST("MC/EvRec/PrimaryOmegaMinusRapidity"), cascPt, recoMult);
histos.fill(HIST("MC/EvRec/PrimaryOmegaMinusRapidity"), cascPt, bestCentrality);
if (casc.pdgCode() == PDG_t::kOmegaPlusBar)
histos.fill(HIST("MC/EvRec/PrimaryOmegaPlusRapidity"), cascPt, recoMult);
histos.fill(HIST("MC/EvRec/PrimaryOmegaPlusRapidity"), cascPt, bestCentrality);
}
}
}
}
}
// fill centrality exactly once for each rec gen event
if (biggestNContribs >= 0) {
histos.fill(HIST("MC/EvRec/MultCent"), bestCentrality, genMult);
histos.fill(HIST("MC/EvRec/Cent"), bestCentrality);
}
}
}

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