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[PWGCF] FemtoUniverse -- Add "fake" K0Short histograms. #16198

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Merged
prchakra merged 5 commits into from
May 11, 2026
+43 −33
Merged

[PWGCF] FemtoUniverse -- Add "fake" K0Short histograms. #16198

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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
c558ef1
Merge branch 'master' into hInvMassK0Short_fake
a-m-andrushko May 11, 2026
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76 changes: 43 additions & 33 deletions PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackV0Helicity.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -326,20 +326,24 @@ 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, {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});
thetaRegistry.add("Theta/Mother/Data/hInvMassLambdaHel1", " ; p_{T} (GeV/#it{c}); M_{#Lambda};", kTH2F, {helicityconfigs.confInvMassMotherpTBinsHel, helicityconfigs.confInvMassMotherBinsHel});
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});
thetaRegistry.add("Theta/Mother/MCReco/hInvMassLambdaMCHel3", " ; M_{#Lambda}; ;", kTH1F, {helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/MCReco/hInvMassLambdaMCHel4", " ; M_{#Lambda}; ;", kTH1F, {helicityconfigs.confInvMassMotherBinsHel});
thetaRegistry.add("Theta/Mother/MCReco/hInvMassK0ShortMC", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/MCReco/hInvMassK0ShortMCHel1", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/MCReco/hInvMassK0ShortMCHel2", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/MCReco/hInvMassK0ShortMCHel3", " ; M_{K^{0}_{S}}; ;", kTH1F, {helicityconfigs.confInvMassK0Short});
thetaRegistry.add("Theta/Mother/MCReco/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 @@ -492,6 +496,7 @@ 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 @@ -507,43 +512,48 @@ 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)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassMotherHel1"), part.pt(), part.mLambda());
else if (cosineTheta < helicityconfigs.confLimitHel1 && cosineTheta >= helicityconfigs.confLimitHel2)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassMotherHel2"), part.pt(), part.mLambda());
else if (cosineTheta < helicityconfigs.confLimitHel2 && cosineTheta >= helicityconfigs.confLimitHel3)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassMotherHel3"), part.pt(), part.mLambda());
else if (cosineTheta < helicityconfigs.confLimitHel3 && cosineTheta >= helicityconfigs.confLimitHel4)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassMotherHel4"), part.pt(), part.mLambda());
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) {
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) {
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) {
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 K0S in the Lambda sample for each helicity bin
/// Histogramming for MC Reco to calculate fraction of K0Short in the Lambda sample for each helicity bin
if constexpr (confIsMC) {
if (part.has_fdMCParticle()) {
if ((part.fdMCParticle()).pdgMCTruth() == kLambda0)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassLambdaMC"), part.mLambda());
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassLambdaMC"), part.mLambda());
else if ((part.fdMCParticle()).pdgMCTruth() == kK0Short)
thetaRegistry.fill(HIST("Theta/Mother/hInvMassK0ShortMC"), part.mKaon());
thetaRegistry.fill(HIST("Theta/Mother/MCReco/hInvMassK0ShortMC"), part.mKaon());

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