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[ALICE3] Add tracking performance info to task #15781

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Merged
njacazio merged 1 commit into from
Apr 15, 2026
+35 −23
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[ALICE3] Add tracking performance info to task #15781

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58 changes: 35 additions & 23 deletions ALICE3/Tasks/alice3TrackingPerformance.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@
///
/// \brief This task produces the tracking performance
///
/// \author Nicolò Jacazio, Universita del Piemonte Orientale (IT)
/// \author Nicolò Jacazio, Università del Piemonte Orientale (IT)
/// \since May 27, 2025
///

Expand Down Expand Up @@ -46,7 +46,9 @@ std::map<int, std::shared_ptr<TH1>> particlePtDistribution;
std::map<int, std::shared_ptr<TH1>> particleEtaDistribution;
std::map<int, std::shared_ptr<TH1>> ptDistribution;
std::map<int, std::shared_ptr<TH2>> ptResolutionVsPt;
std::map<int, std::shared_ptr<TProfile2D>> ptResolutionVsEta;
std::map<int, std::shared_ptr<TH2>> invPtResolutionVsPt;
std::map<int, std::shared_ptr<TProfile2D>> invPtResolutionVsEta;
std::map<int, std::shared_ptr<TH2>> dcaXyResolutionVsPt;
std::map<int, std::shared_ptr<TH2>> dcaZResolutionVsPt;

Expand All @@ -57,26 +59,30 @@ struct Alice3TrackingPerformance {

void init(o2::framework::InitContext&)
{
const AxisSpec axisPt{100, 0, 10, "p_{T} (GeV/c)"};
const AxisSpec axisPt{500, 0, 100, "#it{p}_{T} (GeV/#it{c})"};
const AxisSpec axisEta{100, etaRange.value.first, etaRange.value.second, "#eta"};
const AxisSpec axisPtDelta{100, -1, 1, "p_{T}^{gen} - p_{T}^{reco} (GeV/c)"};
const AxisSpec axisInvPtDelta{100, -1, 1, "1./p_{T}^{gen} - 1./p_{T}^{reco} (GeV/c)^{-1}"};
const AxisSpec axisPtDelta{100, -1, 1, "(#it{p}_{T}^{reco} - #it{p}_{T}^{gen}) / #it{p}_{T}^{gen}"};
const AxisSpec axisInvPtDelta{100, -1, 1, "1./#it{p}_{T}^{gen} - 1./#it{p}_{T}^{reco} (GeV/#it{c})^{-1}"};
const AxisSpec axisDcaXy{100, -1, 1, "DCA_{xy} (cm)"};
const AxisSpec axisDcaZ{100, -1, 1, "DCA_{z} (cm)"};
particlePdgCodes = histos.add<TH1>("particlePdgCodes", "", kTH1D, {AxisSpec{100, -0.5, 99.5, "PDG Code"}});
for (const int& pdg : pdgCodes.value) {
std::string tag = Form("_%d", pdg);
std::string prefix = Form("%i", pdg);
if (pdg < 0) {
tag = Form("_m%d", -pdg);
prefix = Form("m%i", -pdg);
}
particlePtDistribution[pdg] = histos.add<TH1>("particlePtDistribution" + tag, "", kTH1D, {axisPt});
particleEtaDistribution[pdg] = histos.add<TH1>("particleEtaDistribution" + tag, "", kTH1D, {axisEta});
const std::string tag = "_" + prefix;
prefix += "/";
particlePtDistribution[pdg] = histos.add<TH1>(prefix + "particlePtDistribution" + tag, "", kTH1D, {axisPt});
particleEtaDistribution[pdg] = histos.add<TH1>(prefix + "particleEtaDistribution" + tag, "", kTH1D, {axisEta});

ptDistribution[pdg] = histos.add<TH1>("ptDistribution" + tag, "", kTH1D, {axisPt});
ptResolutionVsPt[pdg] = histos.add<TH2>("ptResolutionVsPt" + tag, "", kTH2D, {axisPt, axisPtDelta});
invPtResolutionVsPt[pdg] = histos.add<TH2>("invPtResolutionVsPt" + tag, "", kTH2D, {axisPt, axisInvPtDelta});
dcaXyResolutionVsPt[pdg] = histos.add<TH2>("dcaXyResolutionVsPt" + tag, "", kTH2D, {axisPt, axisDcaXy});
dcaZResolutionVsPt[pdg] = histos.add<TH2>("dcaZResolutionVsPt" + tag, "", kTH2D, {axisPt, axisDcaZ});
ptDistribution[pdg] = histos.add<TH1>(prefix + "ptDistribution" + tag, "", kTH1D, {axisPt});
ptResolutionVsPt[pdg] = histos.add<TH2>(prefix + "ptResolutionVsPt" + tag, "", kTH2D, {axisPt, axisPtDelta});
ptResolutionVsEta[pdg] = histos.add<TProfile2D>(prefix + "ptResolutionVsEta" + tag, "", kTProfile2D, {axisPt, axisEta});
invPtResolutionVsPt[pdg] = histos.add<TH2>(prefix + "invPtResolutionVsPt" + tag, "", kTH2D, {axisPt, axisInvPtDelta});
invPtResolutionVsEta[pdg] = histos.add<TProfile2D>(prefix + "invPtResolutionVsEta" + tag, "", kTProfile2D, {axisPt, axisEta});
dcaXyResolutionVsPt[pdg] = histos.add<TH2>(prefix + "dcaXyResolutionVsPt" + tag, "", kTH2D, {axisPt, axisDcaXy});
dcaZResolutionVsPt[pdg] = histos.add<TH2>(prefix + "dcaZResolutionVsPt" + tag, "", kTH2D, {axisPt, axisDcaZ});
}
}

Expand Down Expand Up @@ -110,26 +116,32 @@ struct Alice3TrackingPerformance {
particleEtaDistribution[mcParticle.pdgCode()]->Fill(mcParticle.eta());
}
for (const auto& track : tracks) {
ptDistribution[0]->Fill(track.pt());
if (!track.has_mcParticle()) {
continue;
}
const auto& mcParticle = track.mcParticle();
ptResolutionVsPt[0]->Fill(mcParticle.pt(), mcParticle.pt() - track.pt());
invPtResolutionVsPt[0]->Fill(mcParticle.pt(), 1.f / mcParticle.pt() - 1.f / track.pt());
dcaXyResolutionVsPt[0]->Fill(mcParticle.pt(), track.dcaXY());
dcaZResolutionVsPt[0]->Fill(mcParticle.pt(), track.dcaZ());
const float ptResolution = (track.pt() - mcParticle.pt()) / mcParticle.pt();
const float invptResolution = 1.f / track.pt() - 1.f / mcParticle.pt();

auto fillResolutionHistograms = [&](const int p) {
ptDistribution[p]->Fill(track.pt());
ptResolutionVsPt[p]->Fill(mcParticle.pt(), ptResolution);
ptResolutionVsEta[p]->Fill(mcParticle.pt(), mcParticle.eta(), ptResolution);
invPtResolutionVsPt[p]->Fill(mcParticle.pt(), invptResolution);
invPtResolutionVsEta[p]->Fill(mcParticle.pt(), mcParticle.eta(), invptResolution);
dcaXyResolutionVsPt[p]->Fill(mcParticle.pt(), track.dcaXY());
dcaZResolutionVsPt[p]->Fill(mcParticle.pt(), track.dcaZ());
};

fillResolutionHistograms(0);

if (!isParticleSelected(mcParticle)) {
continue;
}
if (ptResolutionVsPt.find(mcParticle.pdgCode()) == ptResolutionVsPt.end()) {
continue;
}
ptDistribution[mcParticle.pdgCode()]->Fill(mcParticle.pt());
ptResolutionVsPt[mcParticle.pdgCode()]->Fill(mcParticle.pt(), mcParticle.pt() - track.pt());
invPtResolutionVsPt[mcParticle.pdgCode()]->Fill(mcParticle.pt(), 1.f / mcParticle.pt() - 1.f / track.pt());
dcaXyResolutionVsPt[mcParticle.pdgCode()]->Fill(mcParticle.pt(), track.dcaXY());
dcaZResolutionVsPt[mcParticle.pdgCode()]->Fill(mcParticle.pt(), track.dcaZ());
fillResolutionHistograms(mcParticle.pdgCode());
}
}
};
Expand Down
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