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[PWGJE] Fix leading-jet selection (Rec) and event normalization #18050

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[PWGJE] Fix leading-jet selection (Rec) and event normalization #18050

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7ddb95e
[PWGJE] Fix leading-jet selection (Rec) and event normalization
Arvindiiti Sep 24, 2026
778a227
Merge branch 'AliceO2Group:master' into master
arvindkhuntia Sep 24, 2026
cac60a3
Use corrected jet pT for leading-jet selection
Arvindiiti Sep 25, 2026
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54 changes: 48 additions & 6 deletions PWGJE/Tasks/nucleiInJets.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -328,7 +328,8 @@ struct nucleiInJets {
jetHist.add("jet/h2JetPtVsBkgRho", "jet_{p_{T}} vs background #rho; jet_{p_{T}} (GeV/c); #rho (GeV/c/area)", kTH2F, {PtJetAxis, {100, 0, 20}});
jetHist.add("jet/h1BkgRho", "Background #rho; #rho (GeV/c/area); Entries", kTH1F, {{100, 0, 20}});
jetHist.add("jet/h1JetEvents", "NumbeOfJetEvents", kTH1F, {{1, 0, 1}});
jetHist.add("jetBkgSub/h1JetEvents", "Number of jet events with leading p_{T}^{jet,bkg sub} above cfgjetPtBkgSubMin", kTH1F, {{1, 0, 1}});
jetHist.add("jetBkgSub/h1JetEventsBeforeRhoSelection", "Number of jet events with leading p_{T}^{jet,bkg sub} above cfgjetPtBkgSubMin before rho selection", kTH1F, {{1, 0, 1}});
jetHist.add("jetBkgSub/h1JetEvents", "Number of jet events with leading p_{T}^{jet,bkg sub} above cfgjetPtBkgSubMin and rho > 0", kTH1F, {{1, 0, 1}});
jetHist.add("jetBkgSub/h1BkgRhoLeadingJetPtBkgSubAboveCut", "Background #rho for events with leading p_{T}^{jet,bkg sub} above cfgjetPtBkgSubMin; #rho (GeV/#it{c}/area); Entries", kTH1F, {{100, 0, 20}});
jetHist.add("jet/h1JetEta", "jet_{#eta}", kTH1F, {{100, -1.0, 1.0}});
jetHist.add("jet/h1JetPhi", "jet_{#phi}", kTH1F, {{80, -1.0, 7.}});
Expand Down Expand Up @@ -1818,7 +1819,7 @@ struct nucleiInJets {
jetHist.fill(HIST("jetBkgSub/h1LeadingJetPtBkgSub"), leadingJetPtBkgSub);
jetHist.fill(HIST("jetBkgSub/h2LeadingJetPtBkgSubVsVertexZ"), leadingJetPtBkgSub, collision.posZ());
}
if (leadingJetPtBkgSub > cfgjetPtBkgSubMin) {
if (backgroundRho > 0 && leadingJetPtBkgSub > cfgjetPtBkgSubMin) {
jetHist.fill(HIST("jetBkgSub/vertexZ"), collision.posZ());
jetHist.fill(HIST("jetBkgSub/h1BkgRhoLeadingJetPtBkgSubAboveCut"), backgroundRho);
jetHist.fill(HIST("hNEvents"), 8.5);
Expand All @@ -1829,7 +1830,10 @@ struct nucleiInJets {
return;
jetHist.fill(HIST("jet/h1JetEvents"), 0.5);
if (leadingJetPtBkgSub > cfgjetPtBkgSubMin) {
jetHist.fill(HIST("jetBkgSub/h1JetEvents"), 0.5);
jetHist.fill(HIST("jetBkgSub/h1JetEventsBeforeRhoSelection"), 0.5);
if (backgroundRho > 0) {
jetHist.fill(HIST("jetBkgSub/h1JetEvents"), 0.5);
}
}
for (const auto& track : tracks) {
auto trk = track.track_as<TrackCandidates>();
Expand Down Expand Up @@ -1920,7 +1924,7 @@ struct nucleiInJets {
jetHist.fill(HIST("jetBkgSub/h1LeadingJetPtBkgSub"), leadingJetPtBkgSub);
jetHist.fill(HIST("jetBkgSub/h2LeadingJetPtBkgSubVsVertexZ"), leadingJetPtBkgSub, collision.posZ());
}
if (leadingJetPtBkgSub > cfgjetPtBkgSubMin) {
if (backgroundRho > 0 && leadingJetPtBkgSub > cfgjetPtBkgSubMin) {
jetHist.fill(HIST("jetBkgSub/vertexZ"), collision.posZ());
jetHist.fill(HIST("jetBkgSub/h1BkgRhoLeadingJetPtBkgSubAboveCut"), backgroundRho);
jetHist.fill(HIST("hNEvents"), 8.5);
Expand All @@ -1931,7 +1935,10 @@ struct nucleiInJets {
return;
jetHist.fill(HIST("jet/h1JetEvents"), 0.5);
if (leadingJetPtBkgSub > cfgjetPtBkgSubMin) {
jetHist.fill(HIST("jetBkgSub/h1JetEvents"), 0.5);
jetHist.fill(HIST("jetBkgSub/h1JetEventsBeforeRhoSelection"), 0.5);
if (backgroundRho > 0) {
jetHist.fill(HIST("jetBkgSub/h1JetEvents"), 0.5);
}
}
for (auto& track : tracks) {
auto trk = track.track_as<TrackCandidatesLfPid>();
Expand Down Expand Up @@ -2453,16 +2460,43 @@ struct nucleiInJets {
if (!jetderiveddatautilities::selectCollision(collision, jetderiveddatautilities::initialiseEventSelectionBits("sel8")))
return;

if (selNoSameBunchPileup && !jetderiveddatautilities::selectCollision(collision, jetderiveddatautilities::initialiseEventSelectionBits("NoSameBunchPileup")))
return;
if (selIsGoodZvtxFT0vsPV && !jetderiveddatautilities::selectCollision(collision, jetderiveddatautilities::initialiseEventSelectionBits("IsGoodZvtxFT0vsPV")))
return;
if (useOccupancy && !isOccupancyAccepted(collision))
return;

jetHist.fill(HIST("recmatched/vertexZ"), collision.posZ());

// Event-wise random splitting for closure test: decide once per event
bool useDataLikeHist = (randUniform.Uniform(0, 1) < 0.5);
const float backgroundRho = collision.rho();
if (usebkgSubractionMC && backgroundRho <= 0.f) {
return;
}
const float jetArea = M_PI * cfgjetR * cfgjetR;
if (usebkgSubractionMC) {
jetHist.fill(HIST("jet/h1BkgRho"), backgroundRho);
}

// Select the accepted detector-level leading jet before considering matches.
int64_t leadingDetJetId = -1;
float leadingDetJetPt = -1.f;
if (isWithLeadingJet) {
for (const auto& mcdjet : mcdjets) {
const float mcdJetPtForResponseSel = usebkgSubractionMC ? mcdjet.pt() - backgroundRho * jetArea : mcdjet.pt();
if (isConeAxisAccepted(mcdjet.eta()) && mcdJetPtForResponseSel > leadingDetJetPt) {
leadingDetJetPt = mcdJetPtForResponseSel;
leadingDetJetId = mcdjet.globalIndex();
}
}
if (leadingDetJetId < 0) {
return;
}
}

std::vector<int64_t> mcdJetIds{};
std::vector<double> mcdJetPt{};
std::vector<double> mcdJetPhi{};
std::vector<double> mcdJetEta{};
Expand All @@ -2483,7 +2517,7 @@ struct nucleiInJets {
continue;

const float mcdJetPtForResponse = usebkgSubractionMC ? mcdjet.pt() - backgroundRho * jetArea : mcdjet.pt();
if (mcdJetPtForResponse < cfgjetPtBkgSubMinMC) {
if (mcdJetPtForResponse <= cfgjetPtBkgSubMinMC) {
continue;
}
const double jetAxisEtaForEff = isWithLeadingJet ? (useLeadingJetDetLevelValue ? mcdjet.eta() : mcpjet.eta()) : mcdjet.eta();
Expand All @@ -2496,6 +2530,7 @@ struct nucleiInJets {
jetHist.fill(HIST("recmatched/qa/h2JetConeEtaPhiAfterAcceptance"), jetAxisEtaForEff, jetAxisPhiForEff);
jetHist.fill(HIST("recmatched/qa/h2PerpConeEtaPhiAfterAcceptance"), jetAxisEtaForEff, perpConePhiJet[0]);
jetHist.fill(HIST("recmatched/qa/h2PerpConeEtaPhiAfterAcceptance"), jetAxisEtaForEff, perpConePhiJet[1]);
mcdJetIds.push_back(mcdjet.globalIndex());
mcdJetPt.push_back(mcdJetPtForResponse);
mcdJetPhi.push_back(mcdjet.phi());
mcdJetEta.push_back(mcdjet.eta());
Expand Down Expand Up @@ -2523,6 +2558,13 @@ struct nucleiInJets {
} else {
LOGP(fatal, "Error: Index {} is out of range for vectors!", indexJet);
}
if (isWithLeadingJet) {
const auto leadingMatch = std::find(mcdJetIds.begin(), mcdJetIds.end(), leadingDetJetId);
if (leadingMatch == mcdJetIds.end()) {
return; // Do not replace an unmatched or rejected leading jet with a subleading jet.
}
indexJet = std::distance(mcdJetIds.begin(), leadingMatch);
}
if (useMcC) {
if (useDataLikeHist)
jetHist.fill(HIST("recmatched/h2ResponseMatrixLeadingJet"), mcdJetPt.at(indexJet), mcpJetPt.at(indexJet));
Expand Down
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