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[PWGCF] Added an event occupancy cut #13696

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Merged
victor-gonzalez merged 3 commits into from
Nov 5, 2025
Merged

[PWGCF] Added an event occupancy cut #13696

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0c8d506
Added an event occupancy cut
JStaa Nov 5, 2025
66f6158
Please consider the following formatting changes
alibuild Nov 5, 2025
089c625
Merge pull request #44 from alibuild/alibot-cleanup-13696
JStaa Nov 5, 2025
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49 changes: 43 additions & 6 deletions PWGCF/MultiparticleCorrelations/Tasks/threeParticleCorrelations.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -48,12 +48,18 @@ struct ThreeParticleCorrelations {
float trackPtMin = 0.2, trackPtMax = 3.0;
float trackEtaMax = 0.8;

Configurable<float> zvtxMax{"zvtxMax", 10.0, "Maximum collision Z-vertex position (cm)"};

// Track PID parameters
double pionID = 0.0, kaonID = 1.0, protonID = 2.0;
float nSigma0 = 0.0, nSigma1 = 1.0, nSigma2 = 2.0, nSigma4 = 4.0, nSigma5 = 5.0;

// Event selection parameters
struct : ConfigurableGroup {
std::string prefix = "EventSelection";
Configurable<float> zvtxMax{"zvtxMax", 10.0, "Maximum collision Z-vertex position (cm)"};
Configurable<int> occupMin{"occupMin", 0, "Minimum collision occupancy"};
Configurable<int> occupMax{"occupMax", 15000, "Maximum collision occupancy"};
} evSelGroup;

// V0 filter parameters
struct : ConfigurableGroup {
std::string prefix = "V0Selection";
Expand All @@ -77,7 +83,7 @@ struct ThreeParticleCorrelations {

// Lambda invariant mass fit
Configurable<float> invMassNSigma{"invMassNSigma", 4.0, "Number of standard deviations from the mean of the Lambda invariant mass peak"};
double dGaussSigma = 0.0019;
double dGaussSigma = 0.002;

// Histogram registry
HistogramRegistry rMECorrRegistry{"MECorrRegistry", {}, OutputObjHandlingPolicy::AnalysisObject, false, true};
Expand All @@ -88,8 +94,8 @@ struct ThreeParticleCorrelations {

// Collision & Event filters
Filter collCent = aod::cent::centFT0C > centMin&& aod::cent::centFT0C < centMax;
Filter collZvtx = nabs(aod::collision::posZ) < zvtxMax;
Filter mcCollZvtx = nabs(aod::mccollision::posZ) < zvtxMax;
Filter collZvtx = nabs(aod::collision::posZ) < evSelGroup.zvtxMax;
Filter mcCollZvtx = nabs(aod::mccollision::posZ) < evSelGroup.zvtxMax;
Filter evSelect = aod::evsel::sel8 == true;

// Track filters
Expand Down Expand Up @@ -184,6 +190,7 @@ struct ThreeParticleCorrelations {
const AxisSpec centralityAxis{confCentBins};
const AxisSpec fineCentralityAxis{fineCentBins};
const AxisSpec zvtxAxis{confZvtxBins};
const AxisSpec occupancyAxis{200, 0, 20000};
const AxisSpec dPhiAxis{36, (-1. / 2) * constants::math::PI, (3. / 2) * constants::math::PI};
const AxisSpec dEtaAxis{32, -1.52, 1.52};
const AxisSpec v0PtAxis{114, 0.6, 12};
Expand All @@ -193,14 +200,17 @@ struct ThreeParticleCorrelations {
const AxisSpec lambdaInvMassAxis{100, 1.08, 1.16};

// QA & PID
rQARegistry.add("hNEvents", "hNEvents", {HistType::kTH1D, {{3, 0, 3}}});
rQARegistry.add("hNEvents", "hNEvents", {HistType::kTH1D, {{5, 0, 5}}});
rQARegistry.get<TH1>(HIST("hNEvents"))->GetXaxis()->SetBinLabel(1, "All");
rQARegistry.get<TH1>(HIST("hNEvents"))->GetXaxis()->SetBinLabel(2, "kIsGoodZvtxFT0vsPV");
rQARegistry.get<TH1>(HIST("hNEvents"))->GetXaxis()->SetBinLabel(3, "kNoSameBunchPileup");
rQARegistry.get<TH1>(HIST("hNEvents"))->GetXaxis()->SetBinLabel(4, "Occupancy window");
rQARegistry.get<TH1>(HIST("hNEvents"))->GetXaxis()->SetBinLabel(5, "kNoCollInTimeRangeStandard");

rQARegistry.add("hEventCentrality", "hEventCentrality", {HistType::kTH1D, {{fineCentralityAxis}}});
rQARegistry.add("hEventCentrality_MC", "hEventCentrality_MC", {HistType::kTH1D, {{fineCentralityAxis}}});
rQARegistry.add("hEventZvtx", "hEventZvtx", {HistType::kTH1D, {{zvtxAxis}}});
rQARegistry.add("hEventOccupancy", "hEventOccupancy", {HistType::kTH1D, {{occupancyAxis}}});
rQARegistry.add("hEventBfield", "hEventBfield", {HistType::kTH1D, {{2, -1, 1}}});
rQARegistry.add("hTrackPt", "hTrackPt", {HistType::kTH1D, {{100, 0, 4}}});
rQARegistry.add("hTrackEta", "hTrackEta", {HistType::kTH1D, {{100, -1, 1}}});
Expand All @@ -215,6 +225,9 @@ struct ThreeParticleCorrelations {
rQARegistry.add("hPtKaon_Corrected", "hPtKaon_Corrected", {HistType::kTH3D, {{trackPtAxis}, {fineCentralityAxis}, {2, -2, 2}}});
rQARegistry.add("hPtProton_Corrected", "hPtProton_Corrected", {HistType::kTH3D, {{trackPtAxis}, {fineCentralityAxis}, {2, -2, 2}}});
rQARegistry.add("hPtV0_Corrected", "hPtV0_Corrected", {HistType::kTH3D, {{v0PtAxis}, {fineCentralityAxis}, {2, -2, 2}}});
rQARegistry.add("hPtPion_Looped", "hPtPion_Looped", {HistType::kTH3D, {{trackPtAxis}, {fineCentralityAxis}, {2, -2, 2}}});
rQARegistry.add("hPtKaon_Looped", "hPtKaon_Looped", {HistType::kTH3D, {{trackPtAxis}, {fineCentralityAxis}, {2, -2, 2}}});
rQARegistry.add("hPtProton_Looped", "hPtProton_Looped", {HistType::kTH3D, {{trackPtAxis}, {fineCentralityAxis}, {2, -2, 2}}});
rQARegistry.add("hPtPion_MC", "hPtPion_MC", {HistType::kTH3D, {{trackPtAxis}, {fineCentralityAxis}, {2, -2, 2}}});
rQARegistry.add("hPtKaon_MC", "hPtKaon_MC", {HistType::kTH3D, {{trackPtAxis}, {fineCentralityAxis}, {2, -2, 2}}});
rQARegistry.add("hPtProton_MC", "hPtProton_MC", {HistType::kTH3D, {{trackPtAxis}, {fineCentralityAxis}, {2, -2, 2}}});
Expand Down Expand Up @@ -364,6 +377,7 @@ struct ThreeParticleCorrelations {
void processSame(MyFilteredCollision const& collision, aod::V0Datas const& v0s, MyFilteredTracks const& tracks, aod::BCsWithTimestamps const&)
{

rQARegistry.fill(HIST("hEventOccupancy"), collision.trackOccupancyInTimeRange());
if (!acceptEvent(collision, true)) {
return;
}
Expand Down Expand Up @@ -444,6 +458,14 @@ struct ThreeParticleCorrelations {
deltaPhi = RecoDecay::constrainAngle(trigger.phi() - associate.phi(), -constants::math::PIHalf);
deltaEta = trigger.eta() - associate.eta();

if (assocPID[0] == pionID) { // Pions
rQARegistry.fill(HIST("hPtPion_Looped"), associate.pt(), collision.centFT0C(), associate.sign(), ratioCorrection(hCorrectionPions, associate, collision.centFT0C()) / trackEff(hEffPions, associate, collision.centFT0C()));
} else if (assocPID[0] == kaonID) { // Kaons
rQARegistry.fill(HIST("hPtKaon_Looped"), associate.pt(), collision.centFT0C(), associate.sign(), ratioCorrection(hCorrectionKaons, associate, collision.centFT0C()) / trackEff(hEffKaons, associate, collision.centFT0C()));
} else if (assocPID[0] == protonID) { // Protons
rQARegistry.fill(HIST("hPtProton_Looped"), associate.pt(), collision.centFT0C(), associate.sign(), ratioCorrection(hCorrectionProtons, associate, collision.centFT0C()) / trackEff(hEffProtons, associate, collision.centFT0C()));
}

if (candMass >= MassLambda0 - invMassNSigma * dGaussSigma && candMass <= MassLambda0 + invMassNSigma * dGaussSigma) {
if (assocPID[0] == pionID) { // Pions
rSECorrRegistry.fill(HIST("hSameLambdaPion_SGNL"), deltaPhi, deltaEta, collision.centFT0C(), collision.posZ(), triggSign, associate.sign(), ratioCorrection(hCorrectionPions, associate, collision.centFT0C()) / (trackEff(hEffPions, associate, collision.centFT0C()) * v0Efficiency));
Expand Down Expand Up @@ -1002,6 +1024,21 @@ struct ThreeParticleCorrelations {
rQARegistry.fill(HIST("hNEvents"), 2.5);
}

int occupEstim = col.trackOccupancyInTimeRange();
if (occupEstim <= evSelGroup.occupMin || occupEstim >= evSelGroup.occupMax) { // Occupancy window
return false;
}
if (FillHist) {
rQARegistry.fill(HIST("hNEvents"), 3.5);
}

if (!col.selection_bit(aod::evsel::kNoCollInTimeRangeStandard)) { // kNoCollInTimeRangeStandard
return false;
}
if (FillHist) {
rQARegistry.fill(HIST("hNEvents"), 4.5);
}

return true;
}

Expand Down
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