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[PWGCF] FemtoUniverse -- Add extra histograms for K0S and Lambda. #16117

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Merged
prchakra merged 4 commits into from
May 5, 2026
+82 −42
Merged

[PWGCF] FemtoUniverse -- Add extra histograms for K0S and Lambda. #16117

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9cf21c8
Add hInvMassK0Short to helicity analysis
a-m-andrushko May 4, 2026
8e4fd6f
Add extra histos
a-m-andrushko May 5, 2026
0dc6c86
Add extra histos and fix some O2 linter errors
a-m-andrushko May 5, 2026
7215c09
Merge branch 'master' into hInvMassK0Short_histos
a-m-andrushko May 5, 2026
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124 changes: 82 additions & 42 deletions PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackV0Helicity.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -182,14 +182,21 @@ struct FemtoUniversePairTaskTrackV0Helicity {
} twotracksconfigs;

/// Helicity ranges and configurables
Configurable<bool> cfgProcessHel{"cfgProcessHel", true, "Process particle pairs from all helicity ranges"};
Configurable<bool> cfgProcessHel1{"cfgProcessHel1", false, "Process particle pairs from the helicity range 1"}; // 1.0 >= cosineTheta >= 0.1
Configurable<bool> cfgProcessHel2{"cfgProcessHel2", false, "Process particle pairs from the helicity range 2"}; // 0.1 > cosineTheta >= -0.1
Configurable<bool> cfgProcessHel3{"cfgProcessHel3", false, "Process particle pairs from the helicity range 3"}; // -0.1 > cosineTheta >= -0.5
Configurable<bool> cfgProcessHel4{"cfgProcessHel4", false, "Process particle pairs from the helicity range 4"}; // -0.5 > cosineTheta >= -1.0
ConfigurableAxis confInvMassMotherpTBinsHel{"confInvMassMotherpTBinsHel", {5, 0, 5}, "pT binning in the pT vs. InvMassMother plot for helicity"};
ConfigurableAxis confInvMassMotherBinsHel{"confInvMassMotherBinsHel", {1000, 0.8, 1.4}, "InvMassMother binning in the pT vs. InvMassMother plot for helicity"};
ConfigurableAxis confInvMassK0Short{"confInvMassK0s", {1000, 0.2, 0.8}, "Invariant mass binning for K0 Short"};
struct : o2::framework::ConfigurableGroup {
Configurable<bool> cfgProcessHel{"cfgProcessHel", true, "Process particle pairs from all helicity ranges"};
Configurable<bool> cfgProcessHel1{"cfgProcessHel1", false, "Process particle pairs from the helicity range 1"}; // 1.0 >= cosineTheta >= 0.1
Configurable<bool> cfgProcessHel2{"cfgProcessHel2", false, "Process particle pairs from the helicity range 2"}; // 0.1 > cosineTheta >= -0.1
Configurable<bool> cfgProcessHel3{"cfgProcessHel3", false, "Process particle pairs from the helicity range 3"}; // -0.1 > cosineTheta >= -0.5
Configurable<bool> cfgProcessHel4{"cfgProcessHel4", false, "Process particle pairs from the helicity range 4"}; // -0.5 > cosineTheta >= -1.0
Configurable<float> confLimitHel0{"confLimitHel0", 1.0, "Highest value of the helicity angle"};
Configurable<float> confLimitHel1{"confLimitHel1", 0.1, "Border value between ranges 1 and 2"};
Configurable<float> confLimitHel2{"confLimitHel2", -0.1, "Border value between ranges 2 and 3"};
Configurable<float> confLimitHel3{"confLimitHel3", -0.5, "Border value between ranges 3 and 4"};
Configurable<float> confLimitHel4{"confLimitHel4", -1.0, "Lowest value of the helicity angle"};
ConfigurableAxis confInvMassMotherpTBinsHel{"confInvMassMotherpTBinsHel", {5, 0, 5}, "pT binning in the pT vs. InvMassMother plot for helicity"};
ConfigurableAxis confInvMassMotherBinsHel{"confInvMassMotherBinsHel", {1000, 0.8, 1.4}, "InvMassMother binning in the pT vs. InvMassMother plot for helicity"};
ConfigurableAxis confInvMassK0Short{"confInvMassK0Short", {1000, 0.2, 0.8}, "Invariant mass binning for K0 Short"}; // o2-linter: disable=lowerCamelCase (consistency with generally accepted particle name)
} helicityconfigs;

/// Efficiency
Configurable<std::string> confLocalEfficiency{"confLocalEfficiency", "", "Local path to efficiency .root file"};
Expand Down Expand Up @@ -319,11 +326,20 @@ struct FemtoUniversePairTaskTrackV0Helicity {
thetaRegistry.add("Theta/NegativeChild/hThetaPt", " ; p_{T} (GeV/#it{c}); cos(#theta)", kTH2F, {{100, 0, 10}, {110, -1.1, 1.1}});
thetaRegistry.add("Theta/NegativeChild/hThetaEta", " ; #eta; cos(#theta)", kTH2F, {{100, -1, 1}, {110, -1.1, 1.1}});
thetaRegistry.add("Theta/NegativeChild/hThetaPhi", " ; #phi; cos(#theta)", kTH2F, {{100, -1, 7}, {110, -1.1, 1.1}});
thetaRegistry.add("Theta/Mother/hInvMassMotherHel1", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {confInvMassMotherpTBinsHel, confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassMotherHel2", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {confInvMassMotherpTBinsHel, confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassMotherHel3", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {confInvMassMotherpTBinsHel, confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassMotherHel4", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {confInvMassMotherpTBinsHel, confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassK0Short", " ; M_{K^{0}_{S}}; ;", kTH1F, {confInvMassK0Short});
thetaRegistry.add("Theta/Mother/hInvMassMotherHel1", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {helicityconfigs.confInvMassMotherpTBinsHel, helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassMotherHel2", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {helicityconfigs.confInvMassMotherpTBinsHel, helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassMotherHel3", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {helicityconfigs.confInvMassMotherpTBinsHel, helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassMotherHel4", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {helicityconfigs.confInvMassMotherpTBinsHel, helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassLambdaMC", " ; M_{#Lambda}; ;", kTH1F, {helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassLambdaMCHel1", " ; M_{#Lambda}; ;", kTH1F, {helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassLambdaMCHel2", " ; M_{#Lambda}; ;", kTH1F, {helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassLambdaMCHel3", " ; M_{#Lambda}; ;", kTH1F, {helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassLambdaMCHel4", " ; M_{#Lambda}; ;", kTH1F, {helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/hInvMassK0ShortMC", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/hInvMassK0ShortMCHel1", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/hInvMassK0ShortMCHel2", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/hInvMassK0ShortMCHel3", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/hInvMassK0ShortMCHel4", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});

/// MC Truth
registryMCtruth.add("plus/MCtruthLambda", "MC truth Lambdas;#it{p}_{T} (GeV/c); #eta", {HistType::kTH2F, {{500, 0, 5}, {400, -1.0, 1.0}}});
Expand Down Expand Up @@ -387,39 +403,39 @@ struct FemtoUniversePairTaskTrackV0Helicity {
registryMCreco.add("ThetaMCReco/NegativeChild/hThetaPhi", " ; #phi; cos(#theta)", kTH2F, {{100, -1, 7}, {110, -1.1, 1.1}});

/// Correlations
if (cfgProcessHel) {
if (helicityconfigs.cfgProcessHel) {
sameEventCont.init(&resultRegistry, confkstarBins, confMultBins, confkTBins, confmTBins, confMultBins3D, confmTBins3D, confEtaBins, confPhiBins, confIsMC, confUse3D);
sameEventCont.setPDGCodes(trackconfigs.confTrkPDGCodePartOne, V0configs.confV0PDGCodePartTwo);

mixedEventCont.init(&resultRegistry, confkstarBins, confMultBins, confkTBins, confmTBins, confMultBins3D, confmTBins3D, confEtaBins, confPhiBins, confIsMC, confUse3D);
mixedEventCont.setPDGCodes(trackconfigs.confTrkPDGCodePartOne, V0configs.confV0PDGCodePartTwo);
}

if (cfgProcessHel1) {
if (helicityconfigs.cfgProcessHel1) {
sameEventContHel1.init(&resultRegistryHel1, confkstarBins, confMultBins, confkTBins, confmTBins, confMultBins3D, confmTBins3D, confEtaBins, confPhiBins, confIsMC, confUse3D);
sameEventContHel1.setPDGCodes(trackconfigs.confTrkPDGCodePartOne, V0configs.confV0PDGCodePartTwo);

mixedEventContHel1.init(&resultRegistryHel1, confkstarBins, confMultBins, confkTBins, confmTBins, confMultBins3D, confmTBins3D, confEtaBins, confPhiBins, confIsMC, confUse3D);
mixedEventContHel1.setPDGCodes(trackconfigs.confTrkPDGCodePartOne, V0configs.confV0PDGCodePartTwo);
}

if (cfgProcessHel2) {
if (helicityconfigs.cfgProcessHel2) {
sameEventContHel2.init(&resultRegistryHel2, confkstarBins, confMultBins, confkTBins, confmTBins, confMultBins3D, confmTBins3D, confEtaBins, confPhiBins, confIsMC, confUse3D);
sameEventContHel2.setPDGCodes(trackconfigs.confTrkPDGCodePartOne, V0configs.confV0PDGCodePartTwo);

mixedEventContHel2.init(&resultRegistryHel2, confkstarBins, confMultBins, confkTBins, confmTBins, confMultBins3D, confmTBins3D, confEtaBins, confPhiBins, confIsMC, confUse3D);
mixedEventContHel2.setPDGCodes(trackconfigs.confTrkPDGCodePartOne, V0configs.confV0PDGCodePartTwo);
}

if (cfgProcessHel3) {
if (helicityconfigs.cfgProcessHel3) {
sameEventContHel3.init(&resultRegistryHel3, confkstarBins, confMultBins, confkTBins, confmTBins, confMultBins3D, confmTBins3D, confEtaBins, confPhiBins, confIsMC, confUse3D);
sameEventContHel3.setPDGCodes(trackconfigs.confTrkPDGCodePartOne, V0configs.confV0PDGCodePartTwo);

mixedEventContHel3.init(&resultRegistryHel3, confkstarBins, confMultBins, confkTBins, confmTBins, confMultBins3D, confmTBins3D, confEtaBins, confPhiBins, confIsMC, confUse3D);
mixedEventContHel3.setPDGCodes(trackconfigs.confTrkPDGCodePartOne, V0configs.confV0PDGCodePartTwo);
}

if (cfgProcessHel4) {
if (helicityconfigs.cfgProcessHel4) {
sameEventContHel4.init(&resultRegistryHel4, confkstarBins, confMultBins, confkTBins, confmTBins, confMultBins3D, confmTBins3D, confEtaBins, confPhiBins, confIsMC, confUse3D);
sameEventContHel4.setPDGCodes(trackconfigs.confTrkPDGCodePartOne, V0configs.confV0PDGCodePartTwo);

Expand Down Expand Up @@ -491,19 +507,43 @@ struct FemtoUniversePairTaskTrackV0Helicity {
thetaRegistry.fill(HIST("Theta/NegativeChild/hThetaEta"), negChild.eta(), cosineTheta);
thetaRegistry.fill(HIST("Theta/NegativeChild/hThetaPhi"), negChild.phi(), cosineTheta);

if (cosineTheta <= 1.0 && cosineTheta >= 0.1)
if (cosineTheta <= helicityconfigs.confLimitHel0 && cosineTheta >= helicityconfigs.confLimitHel1)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassMotherHel1"), part.pt(), part.mLambda());
else if (cosineTheta < 0.1 && cosineTheta >= -0.1)
else if (cosineTheta < helicityconfigs.confLimitHel1 && cosineTheta >= helicityconfigs.confLimitHel2)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassMotherHel2"), part.pt(), part.mLambda());
else if (cosineTheta < -0.1 && cosineTheta >= -0.5)
else if (cosineTheta < helicityconfigs.confLimitHel2 && cosineTheta >= helicityconfigs.confLimitHel3)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassMotherHel3"), part.pt(), part.mLambda());
else if (cosineTheta < -0.5 && cosineTheta >= -1)
else if (cosineTheta < helicityconfigs.confLimitHel3 && cosineTheta >= helicityconfigs.confLimitHel4)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassMotherHel4"), part.pt(), part.mLambda());

/// Histogramming for MC Reco to calculate fraction of K0S in the Lambda sample for each helicity bin
if constexpr (confIsMC) {
if (part.has_fdMCParticle()) {
if ((part.fdMCParticle()).pdgMCTruth() == kK0Short) {
thetaRegistry.fill(HIST("Theta/Mother/hInvMassK0Short"), part.mKaon());
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassLambdaMC"), part.mLambda());
else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassK0ShortMC"), part.mKaon());

if (cosineTheta <= helicityconfigs.confLimitHel0 && cosineTheta >= helicityconfigs.confLimitHel1) {
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassLambdaMCHel1"), part.mLambda());
else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassK0ShortMCHel1"), part.mKaon());
} else if (cosineTheta < helicityconfigs.confLimitHel1 && cosineTheta >= helicityconfigs.confLimitHel2) {
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassLambdaMCHel2"), part.mLambda());
else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassK0ShortMCHel2"), part.mKaon());
} else if (cosineTheta < helicityconfigs.confLimitHel2 && cosineTheta >= helicityconfigs.confLimitHel3) {
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassLambdaMCHel3"), part.mLambda());
else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassK0ShortMCHel3"), part.mKaon());
} else if (cosineTheta < helicityconfigs.confLimitHel3 && cosineTheta >= helicityconfigs.confLimitHel4) {
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassLambdaMCHel4"), part.mLambda());
else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassK0ShortMCHel4"), part.mKaon());
}
}
}
Expand Down Expand Up @@ -571,28 +611,28 @@ struct FemtoUniversePairTaskTrackV0Helicity {
}

case 1: {
if (cosineTheta <= 1.0 && cosineTheta >= 0.1)
if (cosineTheta < helicityconfigs.confLimitHel0 && cosineTheta >= helicityconfigs.confLimitHel1)
sameEventContHel1.setPair<false>(p1, p2, multCol, confUse3D, weight);

break;
}

case 2: {
if (cosineTheta < 0.1 && cosineTheta >= -0.1)
if (cosineTheta < helicityconfigs.confLimitHel1 && cosineTheta >= helicityconfigs.confLimitHel2)
sameEventContHel2.setPair<false>(p1, p2, multCol, confUse3D, weight);

break;
}

case 3: {
if (cosineTheta < -0.1 && cosineTheta >= -0.5)
if (cosineTheta < helicityconfigs.confLimitHel2 && cosineTheta >= helicityconfigs.confLimitHel3)
sameEventContHel3.setPair<false>(p1, p2, multCol, confUse3D, weight);

break;
}

case 4: {
if (cosineTheta < -0.5 && cosineTheta >= -1.0)
if (cosineTheta < helicityconfigs.confLimitHel3 && cosineTheta >= helicityconfigs.confLimitHel4)
sameEventContHel4.setPair<false>(p1, p2, multCol, confUse3D, weight);

break;
Expand All @@ -609,19 +649,19 @@ struct FemtoUniversePairTaskTrackV0Helicity {
auto groupPartsOne = partsOne->sliceByCached(aod::femtouniverseparticle::fdCollisionId, col.globalIndex(), cache);
auto groupPartsTwo = partsTwo->sliceByCached(aod::femtouniverseparticle::fdCollisionId, col.globalIndex(), cache);

if (cfgProcessHel)
if (helicityconfigs.cfgProcessHel)
doSameEvent<false>(col, parts, groupPartsOne, groupPartsTwo, 0);

if (cfgProcessHel1)
if (helicityconfigs.cfgProcessHel1)
doSameEvent<false>(col, parts, groupPartsOne, groupPartsTwo, 1);

if (cfgProcessHel2)
if (helicityconfigs.cfgProcessHel2)
doSameEvent<false>(col, parts, groupPartsOne, groupPartsTwo, 2);

if (cfgProcessHel3)
if (helicityconfigs.cfgProcessHel3)
doSameEvent<false>(col, parts, groupPartsOne, groupPartsTwo, 3);

if (cfgProcessHel4)
if (helicityconfigs.cfgProcessHel4)
doSameEvent<false>(col, parts, groupPartsOne, groupPartsTwo, 4);
}
PROCESS_SWITCH(FemtoUniversePairTaskTrackV0Helicity, processSameEvent, "Enable processing same event for track - V0", false);
Expand Down Expand Up @@ -869,28 +909,28 @@ struct FemtoUniversePairTaskTrackV0Helicity {
}

case 1: {
if (cosineTheta <= 1.0 && cosineTheta >= 0.1)
if (cosineTheta < helicityconfigs.confLimitHel0 && cosineTheta >= helicityconfigs.confLimitHel1)
mixedEventContHel1.setPair<false>(p1, p2, multCol, confUse3D, weight);

break;
}

case 2: {
if (cosineTheta < 0.1 && cosineTheta >= -0.1)
if (cosineTheta < helicityconfigs.confLimitHel1 && cosineTheta >= helicityconfigs.confLimitHel2)
mixedEventContHel2.setPair<false>(p1, p2, multCol, confUse3D, weight);

break;
}

case 3: {
if (cosineTheta < -0.1 && cosineTheta >= -0.5)
if (cosineTheta < helicityconfigs.confLimitHel2 && cosineTheta >= helicityconfigs.confLimitHel3)
mixedEventContHel3.setPair<false>(p1, p2, multCol, confUse3D, weight);

break;
}

case 4: {
if (cosineTheta < -0.5 && cosineTheta >= -1.0)
if (cosineTheta < helicityconfigs.confLimitHel3 && cosineTheta >= helicityconfigs.confLimitHel4)
mixedEventContHel4.setPair<false>(p1, p2, multCol, confUse3D, weight);

break;
Expand All @@ -917,19 +957,19 @@ struct FemtoUniversePairTaskTrackV0Helicity {

void processMixedEvent(FilteredFDCollisions const& cols, FemtoFullParticles const& parts)
{
if (cfgProcessHel)
if (helicityconfigs.cfgProcessHel)
doMixedEvent(cols, parts, partsOne, partsTwo, 0);

if (cfgProcessHel1)
if (helicityconfigs.cfgProcessHel1)
doMixedEvent(cols, parts, partsOne, partsTwo, 1);

if (cfgProcessHel2)
if (helicityconfigs.cfgProcessHel2)
doMixedEvent(cols, parts, partsOne, partsTwo, 2);

if (cfgProcessHel3)
if (helicityconfigs.cfgProcessHel3)
doMixedEvent(cols, parts, partsOne, partsTwo, 3);

if (cfgProcessHel4)
if (helicityconfigs.cfgProcessHel4)
doMixedEvent(cols, parts, partsOne, partsTwo, 4);
}
PROCESS_SWITCH(FemtoUniversePairTaskTrackV0Helicity, processMixedEvent, "Enable processing mixed event for track - V0", false);
Expand Down
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