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[PWGCF] FemtoUniverse -- Improve K0Short histogramming. #16222

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Merged
prchakra merged 12 commits into from
May 13, 2026
+33 −26
Merged

[PWGCF] FemtoUniverse -- Improve K0Short histogramming. #16222

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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
35cd3d0
Add fake K0Short histograms
a-m-andrushko May 11, 2026
9e172c4
Merge branch 'AliceO2Group:master' into hInvMassK0Short_fake_improved
a-m-andrushko May 12, 2026
b8e9de6
Improve K0Short histogramming
a-m-andrushko May 12, 2026
e326226
Improve K0Short histogramming
a-m-andrushko May 12, 2026
aaeb1d4
Improve K0Short histogramming
a-m-andrushko May 12, 2026
a889d49
Improve K0Short histogramming
a-m-andrushko May 12, 2026
2afcf28
Merge branch 'master' into hInvMassK0Short_fake_improved
a-m-andrushko May 12, 2026
b99ac0b
Trigger CI
a-m-andrushko May 13, 2026
3b22026
Fix build errors
a-m-andrushko May 13, 2026
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59 changes: 33 additions & 26 deletions PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackV0Helicity.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -195,6 +195,7 @@ struct FemtoUniversePairTaskTrackV0Helicity {
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"};
Configurable<bool> isRealK0Short{"isRealK0Short", true, "If true, fill invariant mass for real K0Short; if false, fill invariant mass as if dealing with Lambda (needed for estimation of K0Short fraction in the Lambda sample)"};
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;

Expand Down Expand Up @@ -330,10 +331,6 @@ struct FemtoUniversePairTaskTrackV0Helicity {
thetaRegistry.add("Theta/Mother/Data/hInvMassLambdaHel2", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {helicityconfigs.confInvMassMotherpTBinsHel, helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/Data/hInvMassLambdaHel3", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {helicityconfigs.confInvMassMotherpTBinsHel, helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/Data/hInvMassLambdaHel4", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {helicityconfigs.confInvMassMotherpTBinsHel, helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/Data/hInvMassK0ShortHel1", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/Data/hInvMassK0ShortHel2", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/Data/hInvMassK0ShortHel3", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/Data/hInvMassK0ShortHel4", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/MCReco/hInvMassLambdaMC", " ; M_{#Lambda}; ;", kTH1F, {helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/MCReco/hInvMassLambdaMCHel1", " ; M_{#Lambda}; ;", kTH1F, {helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/MCReco/hInvMassLambdaMCHel2", " ; M_{#Lambda}; ;", kTH1F, {helicityconfigs.confInvMassMotherBinsHel});
Expand Down Expand Up @@ -496,7 +493,6 @@ struct FemtoUniversePairTaskTrackV0Helicity {
auto negChildMass = pdg->Mass(V0configs.confPDGCodeNegChild);
auto posChildBoosted = FemtoUniverseMath::boostPRF<decltype(posChild)>(posChild, posChildMass, negChild, negChildMass);
auto cosineTheta = (posChildBoosted.Px() * part.px() + posChildBoosted.Py() * part.py() + posChildBoosted.Pz() * part.pz()) / (posChildBoosted.P() * part.p());
auto invMassK0Short = TMath::Sqrt(TMath::Power(TMath::Sqrt(posChild.p() * posChild.p() + pdg->Mass(V0configs.confPDGCodePosChild) * pdg->Mass(V0configs.confPDGCodePosChild)) + TMath::Sqrt(negChild.p() * negChild.p() + pdg->Mass(V0configs.confPDGCodeNegChild) * pdg->Mass(V0configs.confPDGCodeNegChild)), 2) - TMath::Power(posChild.p() + negChild.p(), 2)); // "fake" K0Short invariant mass to estimate their fraction in the Lambda sample

trackHistoPartTwo.fillQA<false, true>(part);
posChildHistos.fillQA<false, true>(posChild);
Expand All @@ -512,19 +508,14 @@ struct FemtoUniversePairTaskTrackV0Helicity {
thetaRegistry.fill(HIST("Theta/NegativeChild/hThetaEta"), negChild.eta(), cosineTheta);
thetaRegistry.fill(HIST("Theta/NegativeChild/hThetaPhi"), negChild.phi(), cosineTheta);

if (cosineTheta <= helicityconfigs.confLimitHel0 && cosineTheta >= helicityconfigs.confLimitHel1) {
if (cosineTheta <= helicityconfigs.confLimitHel0 && cosineTheta >= helicityconfigs.confLimitHel1)
thetaRegistry.fill(HIST("Theta/Mother/Data/hInvMassLambdaHel1"), part.pt(), part.mLambda());
thetaRegistry.fill(HIST("Theta/Mother/Data/hInvMassK0ShortHel1"), invMassK0Short);
} else if (cosineTheta < helicityconfigs.confLimitHel1 && cosineTheta >= helicityconfigs.confLimitHel2) {
else if (cosineTheta < helicityconfigs.confLimitHel1 && cosineTheta >= helicityconfigs.confLimitHel2)
thetaRegistry.fill(HIST("Theta/Mother/Data/hInvMassLambdaHel2"), part.pt(), part.mLambda());
thetaRegistry.fill(HIST("Theta/Mother/Data/hInvMassK0ShortHel2"), invMassK0Short);
} else if (cosineTheta < helicityconfigs.confLimitHel2 && cosineTheta >= helicityconfigs.confLimitHel3) {
else if (cosineTheta < helicityconfigs.confLimitHel2 && cosineTheta >= helicityconfigs.confLimitHel3)
thetaRegistry.fill(HIST("Theta/Mother/Data/hInvMassLambdaHel3"), part.pt(), part.mLambda());
thetaRegistry.fill(HIST("Theta/Mother/Data/hInvMassK0ShortHel3"), invMassK0Short);
} else if (cosineTheta < helicityconfigs.confLimitHel3 && cosineTheta >= helicityconfigs.confLimitHel4) {
else if (cosineTheta < helicityconfigs.confLimitHel3 && cosineTheta >= helicityconfigs.confLimitHel4)
thetaRegistry.fill(HIST("Theta/Mother/Data/hInvMassLambdaHel4"), part.pt(), part.mLambda());
thetaRegistry.fill(HIST("Theta/Mother/Data/hInvMassK0ShortHel4"), invMassK0Short);
}

/// Histogramming for MC Reco to calculate fraction of K0Short in the Lambda sample for each helicity bin
if constexpr (confIsMC) {
Expand All @@ -535,25 +526,41 @@ struct FemtoUniversePairTaskTrackV0Helicity {
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMC"), part.mKaon());

if (cosineTheta <= helicityconfigs.confLimitHel0 && cosineTheta >= helicityconfigs.confLimitHel1) {
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0)
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0) {
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassLambdaMCHel1"), part.mLambda());
else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short)
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel1"), part.mKaon());
} else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short) {
if (helicityconfigs.isRealK0Short)
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel1"), part.mKaon());
else
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel1"), part.mLambda());
}
} else if (cosineTheta < helicityconfigs.confLimitHel1 && cosineTheta >= helicityconfigs.confLimitHel2) {
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0)
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0) {
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassLambdaMCHel2"), part.mLambda());
else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short)
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel2"), part.mKaon());
} else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short) {
if (helicityconfigs.isRealK0Short)
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel2"), part.mKaon());
else
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel2"), part.mLambda());
}
} else if (cosineTheta < helicityconfigs.confLimitHel2 && cosineTheta >= helicityconfigs.confLimitHel3) {
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0)
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0) {
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassLambdaMCHel3"), part.mLambda());
else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short)
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel3"), part.mKaon());
} else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short) {
if (helicityconfigs.isRealK0Short)
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel3"), part.mKaon());
else
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel3"), part.mLambda());
}
} else if (cosineTheta < helicityconfigs.confLimitHel3 && cosineTheta >= helicityconfigs.confLimitHel4) {
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0)
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0) {
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassLambdaMCHel4"), part.mLambda());
else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short)
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel4"), part.mKaon());
} else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short) {
if (helicityconfigs.isRealK0Short)
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel4"), part.mKaon());
else
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMCHel4"), part.mLambda());
}
}
}
}
Expand Down
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