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[ALICE3] Add covariance histograms for track performance #16068

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Merged
njacazio merged 1 commit into from
May 3, 2026
+28 −18
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[ALICE3] Add covariance histograms for track performance #16068

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46 changes: 28 additions & 18 deletions ALICE3/Tasks/alice3TrackingPerformance.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -52,20 +52,25 @@ 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;
std::map<int, std::shared_ptr<TH2>> covariancePtPtVsPt;
std::map<int, std::shared_ptr<TH2>> covarianceDcaXyDcaXyVsPt;
std::map<int, std::shared_ptr<TH2>> covarianceDcaZDcaZVsPt;

struct Alice3TrackingPerformance {
Configurable<std::vector<int>> pdgCodes{"pdgCodes", {0, 211}, "List of PDG codes to consider for efficiency calculation. (0 means all)"};
HistogramRegistry histos{"Histos", {}, OutputObjHandlingPolicy::AnalysisObject};
Configurable<std::pair<float, float>> etaRange{"etaRange", {-5.f, 5.f}, "Eta range for efficiency calculation"};
ConfigurableAxis ptAxis{"ptAxis", {500, 0, 100}, "#it{p}_{T} (GeV/#it{c})"};
ConfigurableAxis etaAxis{"etaAxis", {100, -5.f, 5.f}, "#eta"};
ConfigurableAxis invPtDeltaAxis{"invPtDeltaAxis", {1000, -0.1f, 0.1f}, "1./#it{p}_{T}^{gen} - 1./#it{p}_{T}^{reco} (GeV/#it{c})^{-1}"};

void init(o2::framework::InitContext&)
{
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, "(#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)"};
const AxisSpec axisCovariancePtPt{100, 0, 10, "cov(#it{p}_{T}, #it{p}_{T}) ((GeV/#it{c})^{2})"};
const AxisSpec axisCovarianceDcaXyDcaXy{100, 0, 1, "cov(DCA_{xy}, DCA_{xy}) (cm^{2})"};
const AxisSpec axisCovarianceDcaZDcaZ{100, 0, 1, "cov(DCA_{z}, DCA_{z}) (cm^{2})"};
particlePdgCodes = histos.add<TH1>("particlePdgCodes", "", kTH1D, {AxisSpec{100, -0.5, 99.5, "PDG Code"}});
for (const int& pdg : pdgCodes.value) {
std::string prefix = Form("%i", pdg);
Expand All @@ -74,30 +79,31 @@ struct Alice3TrackingPerformance {
}
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});
particlePtDistribution[pdg] = histos.add<TH1>(prefix + "particlePtDistribution" + tag, "", kTH1D, {ptAxis});
particleEtaDistribution[pdg] = histos.add<TH1>(prefix + "particleEtaDistribution" + tag, "", kTH1D, {etaAxis});

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});
ptDistribution[pdg] = histos.add<TH1>(prefix + "ptDistribution" + tag, "", kTH1D, {ptAxis});
ptResolutionVsPt[pdg] = histos.add<TH2>(prefix + "ptResolutionVsPt" + tag, "", kTH2D, {ptAxis, axisPtDelta});
ptResolutionVsEta[pdg] = histos.add<TProfile2D>(prefix + "ptResolutionVsEta" + tag, "", kTProfile2D, {ptAxis, etaAxis});
invPtResolutionVsPt[pdg] = histos.add<TH2>(prefix + "invPtResolutionVsPt" + tag, "", kTH2D, {ptAxis, invPtDeltaAxis});
invPtResolutionVsEta[pdg] = histos.add<TProfile2D>(prefix + "invPtResolutionVsEta" + tag, "", kTProfile2D, {ptAxis, etaAxis});
dcaXyResolutionVsPt[pdg] = histos.add<TH2>(prefix + "dcaXyResolutionVsPt" + tag, "", kTH2D, {ptAxis, axisDcaXy});
dcaZResolutionVsPt[pdg] = histos.add<TH2>(prefix + "dcaZResolutionVsPt" + tag, "", kTH2D, {ptAxis, axisDcaZ});
covariancePtPtVsPt[pdg] = histos.add<TH2>(prefix + "covariancePtPtVsPt" + tag, "", kTH2D, {ptAxis, axisCovariancePtPt});
covarianceDcaXyDcaXyVsPt[pdg] = histos.add<TH2>(prefix + "covarianceDcaXyDcaXyVsPt" + tag, "", kTH2D, {ptAxis, axisCovarianceDcaXyDcaXy});
covarianceDcaZDcaZVsPt[pdg] = histos.add<TH2>(prefix + "covarianceDcaZDcaZVsPt" + tag, "", kTH2D, {ptAxis, axisCovarianceDcaZDcaZ});
}
}

void process(soa::Join<aod::Tracks, o2::aod::McTrackLabels, o2::aod::TracksDCA> const& tracks,
void process(soa::Join<aod::Tracks, o2::aod::TracksCov, o2::aod::McTrackLabels, o2::aod::TracksDCA, o2::aod::TracksDCACov> const& tracks,
aod::McParticles const& mcParticles)
{
auto isParticleSelected = [&](const o2::aod::McParticle& p) {
if (!p.isPhysicalPrimary()) {
return false;
}
if (p.eta() < etaRange.value.first) {
return false;
}
if (p.eta() > etaRange.value.second) {
const int etaBin = particleEtaDistribution[0]->GetXaxis()->FindBin(p.eta());
if (etaBin < 1 || etaBin > particleEtaDistribution[0]->GetXaxis()->GetNbins()) {
return false;
}
return true;
Expand All @@ -123,6 +129,7 @@ struct Alice3TrackingPerformance {
const auto& mcParticle = track.mcParticle();
const float ptResolution = (track.pt() - mcParticle.pt()) / mcParticle.pt();
const float invptResolution = 1.f / track.pt() - 1.f / mcParticle.pt();
const float covariancePtPt = track.sigma1Pt() * track.sigma1Pt() * track.pt() * track.pt() * track.pt() * track.pt();

auto fillResolutionHistograms = [&](const int p) {
ptDistribution[p]->Fill(track.pt());
Expand All @@ -132,6 +139,9 @@ struct Alice3TrackingPerformance {
invPtResolutionVsEta[p]->Fill(mcParticle.pt(), mcParticle.eta(), invptResolution);
dcaXyResolutionVsPt[p]->Fill(mcParticle.pt(), track.dcaXY());
dcaZResolutionVsPt[p]->Fill(mcParticle.pt(), track.dcaZ());
covariancePtPtVsPt[p]->Fill(mcParticle.pt(), covariancePtPt);
covarianceDcaXyDcaXyVsPt[p]->Fill(mcParticle.pt(), track.sigmaDcaXY2());
covarianceDcaZDcaZVsPt[p]->Fill(mcParticle.pt(), track.sigmaDcaZ2());
};

fillResolutionHistograms(0);
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