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[PWGLF] Add special treatment for decays into two positive PDG code particles #17721

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Merged
romainschotter merged 4 commits into from
Sep 2, 2026
+198 −4
Merged

[PWGLF] Add special treatment for decays into two positive PDG code particles #17721

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b6f1753
Add special treatment for decays into two positive PDG code particles
romainschotter Sep 1, 2026
613e368
Add new strategy to look at generated secondary V0s
romainschotter Sep 1, 2026
d64aad0
Please consider the following formatting changes
alibuild Sep 1, 2026
88bb7f9
Merge pull request #84 from alibuild/alibot-cleanup-17721
romainschotter Sep 1, 2026
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123 changes: 120 additions & 3 deletions PWGLF/Tasks/Strangeness/derivedlambdakzeroanalysis.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -132,7 +132,7 @@
Configurable<bool> doMCAssociation{"doMCAssociation", true, "if MC, do MC association"};
Configurable<bool> doTreatPiToMuon{"doTreatPiToMuon", false, "Take pi decay into muon into account in MC"};
Configurable<bool> doCollisionAssociationQA{"doCollisionAssociationQA", true, "check collision association"};
Configurable<bool> doSecondaryV0s{"doSecondaryV0s", false, "Look at secondary V0s?"};
Configurable<int> doSecondaryV0s{"doSecondaryV0s", 0, "Look at secondary V0s? 0: No; 1: yes via a loop on V0MCCores; 2: yes via a loop on CascMCCores"};

struct : ConfigurableGroup {
std::string prefix = "eventSelections"; // JSON group name
Expand Down Expand Up @@ -548,21 +548,21 @@
BITSET(maskTrackProperties, selPosDeepSec);
BITSET(maskTrackProperties, selPosGoodTPCTrack);
// TPC signal is available: ask for positive track PID
if (v0Selections.tpcPidNsigmaCut < 1e+5) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskK0ShortSpecific, selTPCPIDPositivePion);
BITSET(maskLambdaSpecific, selTPCPIDPositiveProton);
BITSET(maskAntiLambdaSpecific, selTPCPIDPositivePion);
}
// TOF PID
if (v0Selections.requireAtLeastOneHasTOF || v0Selections.requirePosHasTOF || v0Selections.tofPidNsigmaCutK0Pi < 1e+5 || v0Selections.maxDeltaTimePion < 1e+6) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskK0ShortSpecific, selTOFNSigmaPositivePionK0Short);
BITSET(maskK0ShortSpecific, selTOFDeltaTPositivePionK0Short);
}
if (v0Selections.requireAtLeastOneHasTOF || v0Selections.requirePosHasTOF || v0Selections.tofPidNsigmaCutLaPr < 1e+5 || v0Selections.maxDeltaTimeProton < 1e+6) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskLambdaSpecific, selTOFNSigmaPositiveProtonLambda);
BITSET(maskLambdaSpecific, selTOFDeltaTPositiveProtonLambda);
}
if (v0Selections.requireAtLeastOneHasTOF || v0Selections.requirePosHasTOF || v0Selections.tofPidNsigmaCutLaPi < 1e+5 || v0Selections.maxDeltaTimePion < 1e+6) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskAntiLambdaSpecific, selTOFNSigmaPositivePionLambda);
BITSET(maskAntiLambdaSpecific, selTOFDeltaTPositivePionLambda);
}
Expand All @@ -570,21 +570,21 @@
BITSET(maskTrackProperties, selPosGoodTPCTrack);
BITSET(maskTrackProperties, selPosGoodITSTrack);
// TPC signal is available: ask for positive track PID
if (v0Selections.tpcPidNsigmaCut < 1e+5) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskK0ShortSpecific, selTPCPIDPositivePion);
BITSET(maskLambdaSpecific, selTPCPIDPositiveProton);
BITSET(maskAntiLambdaSpecific, selTPCPIDPositivePion);
}
// TOF PID
if (v0Selections.requireAtLeastOneHasTOF || v0Selections.requirePosHasTOF || v0Selections.tofPidNsigmaCutK0Pi < 1e+5 || v0Selections.maxDeltaTimePion < 1e+6) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskK0ShortSpecific, selTOFNSigmaPositivePionK0Short);
BITSET(maskK0ShortSpecific, selTOFDeltaTPositivePionK0Short);
}
if (v0Selections.requireAtLeastOneHasTOF || v0Selections.requirePosHasTOF || v0Selections.tofPidNsigmaCutLaPr < 1e+5 || v0Selections.maxDeltaTimeProton < 1e+6) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskLambdaSpecific, selTOFNSigmaPositiveProtonLambda);
BITSET(maskLambdaSpecific, selTOFDeltaTPositiveProtonLambda);
}
if (v0Selections.requireAtLeastOneHasTOF || v0Selections.requirePosHasTOF || v0Selections.tofPidNsigmaCutLaPi < 1e+5 || v0Selections.maxDeltaTimePion < 1e+6) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskAntiLambdaSpecific, selTOFNSigmaPositivePionLambda);
BITSET(maskAntiLambdaSpecific, selTOFDeltaTPositivePionLambda);
}
Expand All @@ -599,13 +599,13 @@
BITSET(maskTrackProperties, selNegDeepSec);
BITSET(maskTrackProperties, selNegGoodTPCTrack);
// TPC signal is available: ask for negative track PID
if (v0Selections.tpcPidNsigmaCut < 1e+5) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskK0ShortSpecific, selTPCPIDNegativePion);
BITSET(maskLambdaSpecific, selTPCPIDNegativePion);
BITSET(maskAntiLambdaSpecific, selTPCPIDNegativeProton);
}
// TOF PID
if (v0Selections.requireAtLeastOneHasTOF || v0Selections.requireNegHasTOF || v0Selections.tofPidNsigmaCutK0Pi < 1e+5 || v0Selections.maxDeltaTimePion < 1e+6) { // safeguard for no cut

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
BITSET(maskK0ShortSpecific, selTOFNSigmaNegativePionK0Short);
BITSET(maskK0ShortSpecific, selTOFDeltaTNegativePionK0Short);
}
Expand Down Expand Up @@ -1254,24 +1254,33 @@
}

if (doSecondaryV0s) {
histos.add("h2dGenSecK0Short", "h2dGenSecK0Short", kTH2D, {axisConfigurations.axisCentrality, axisConfigurations.axisPt});
histos.add("h2dGenSecLambda", "h2dGenSecLambda", kTH2D, {axisConfigurations.axisCentrality, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambda", "h2dGenSecAntiLambda", kTH2D, {axisConfigurations.axisCentrality, axisConfigurations.axisPt});
histos.add("h2dGenSecLambdaFromXi", "h2dGenSecLambdaFromXi", kTH2D, {axisConfigurations.axisCentrality, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambdaFromXi", "h2dGenSecAntiLambdaFromXi", kTH2D, {axisConfigurations.axisCentrality, axisConfigurations.axisPt});
histos.add("h2dGenSecLambdaFromXiAndXi0", "h2dGenSecLambdaFromXiAndXi0", kTH2D, {axisConfigurations.axisCentrality, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambdaFromXiAndXi0", "h2dGenSecAntiLambdaFromXiAndXi0", kTH2D, {axisConfigurations.axisCentrality, axisConfigurations.axisPt});
histos.add("h2dGenSecLambdaFromOmega", "h2dGenSecLambdaFromOmega", kTH2D, {axisConfigurations.axisCentrality, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambdaFromOmega", "h2dGenSecAntiLambdaFromOmega", kTH2D, {axisConfigurations.axisCentrality, axisConfigurations.axisPt});

histos.add("h2dGenSecK0ShortVsMultMC_RecoedEvt", "h2dGenSecK0ShortVsMultMC_RecoedEvt", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecLambdaVsMultMC_RecoedEvt", "h2dGenSecLambdaVsMultMC_RecoedEvt", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambdaVsMultMC_RecoedEvt", "h2dGenSecAntiLambdaVsMultMC_RecoedEvt", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecLambdaFromXiVsMultMC_RecoedEvt", "h2dGenSecLambdaFromXiVsMultMC_RecoedEvt", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambdaFromXiVsMultMC_RecoedEvt", "h2dGenSecAntiLambdaFromXiVsMultMC_RecoedEvt", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecLambdaFromXiAndXi0VsMultMC_RecoedEvt", "h2dGenSecLambdaFromXiAndXi0VsMultMC_RecoedEvt", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambdaFromXiAndXi0VsMultMC_RecoedEvt", "h2dGenSecAntiLambdaFromXiAndXi0VsMultMC_RecoedEvt", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecLambdaFromOmegaVsMultMC_RecoedEvt", "h2dGenSecLambdaFromOmegaVsMultMC_RecoedEvt", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambdaFromOmegaVsMultMC_RecoedEvt", "h2dGenSecAntiLambdaFromOmegaVsMultMC_RecoedEvt", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});

histos.add("h2dGenSecK0ShortVsMultMC", "h2dGenSecK0ShortVsMultMC", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecLambdaVsMultMC", "h2dGenSecLambdaVsMultMC", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambdaVsMultMC", "h2dGenSecAntiLambdaVsMultMC", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecLambdaFromXiVsMultMC", "h2dGenSecLambdaFromXiVsMultMC", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambdaFromXiVsMultMC", "h2dGenSecAntiLambdaFromXiVsMultMC", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecLambdaFromXiAndXi0VsMultMC", "h2dGenSecLambdaFromXiAndXi0VsMultMC", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambdaFromXiAndXi0VsMultMC", "h2dGenSecAntiLambdaFromXiAndXi0VsMultMC", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecLambdaFromOmegaVsMultMC", "h2dGenSecLambdaFromOmegaVsMultMC", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
histos.add("h2dGenSecAntiLambdaFromOmegaVsMultMC", "h2dGenSecAntiLambdaFromOmegaVsMultMC", kTH2D, {axisConfigurations.axisNch, axisConfigurations.axisPt});
}
Expand Down Expand Up @@ -3156,6 +3165,114 @@
}
}

if (doSecondaryV0s == 1) {
for (auto const& v0MC : V0MCCores) {
if (!v0MC.has_straMCCollision())
continue;

if (v0MC.isPhysicalPrimary()) // select only secondary Lambda
continue;

float ptmc = v0MC.ptMC();
float ymc = 1e3;
if (v0MC.pdgCode() == PDG_t::kK0Short)
ymc = v0MC.rapidityMC(0);
else if (std::abs(v0MC.pdgCode()) == PDG_t::kLambda0)
ymc = v0MC.rapidityMC(1);

if (ymc < v0Selections.rapidityMinCut ||
ymc > v0Selections.rapidityMaxCut)
continue;

auto mcCollision = v0MC.template straMCCollision_as<TMCCollisions>();
if (eventSelections.applyZVtxSelOnMCPV && std::abs(mcCollision.posZ()) > eventSelections.maxZVtxPosition) {
continue;
}
if (eventSelections.requireINEL0 && mcCollision.multMCNParticlesEta10() < 1) {
continue;
}

if (eventSelections.requireINEL1 && mcCollision.multMCNParticlesEta10() < 2) {
continue;
}

float centrality = 100.5f;
if (listBestCollisionIdx[mcCollision.globalIndex()] > -1) {
auto collision = collisions.iteratorAt(listBestCollisionIdx[mcCollision.globalIndex()]);
if constexpr (requires { collision.centFT0C(); }) { // check if we are in Run 3
centrality = getCentralityRun3(collision, useMcCentrality);
} else { // no, we are in Run 2
centrality = eventSelections.useSPDTrackletsCent ? collision.centRun2SPDTracklets() : collision.centRun2V0M();
}

if (v0MC.pdgCode() == PDG_t::kK0Short) {
histos.fill(HIST("h2dGenSecK0ShortVsMultMC_RecoedEvt"), mcCollision.multMCNParticlesEta05(), ptmc);
}
if (v0MC.pdgCode() == PDG_t::kLambda0) {
histos.fill(HIST("h2dGenSecLambdaVsMultMC_RecoedEvt"), mcCollision.multMCNParticlesEta05(), ptmc);
if (v0MC.pdgCodeMother() == PDG_t::kXiMinus) {
histos.fill(HIST("h2dGenSecLambdaFromXiVsMultMC_RecoedEvt"), mcCollision.multMCNParticlesEta05(), ptmc);
}
if (v0MC.pdgCodeMother() == PDG_t::kXiMinus || v0MC.pdgCodeMother() == o2::constants::physics::Pdg::kXi0) {
histos.fill(HIST("h2dGenSecLambdaFromXiAndXi0VsMultMC_RecoedEvt"), mcCollision.multMCNParticlesEta05(), ptmc);
}
if (v0MC.pdgCodeMother() == PDG_t::kOmegaMinus) {
histos.fill(HIST("h2dGenSecLambdaFromOmegaVsMultMC_RecoedEvt"), mcCollision.multMCNParticlesEta05(), ptmc);
}
}
if (v0MC.pdgCode() == PDG_t::kLambda0Bar) {
histos.fill(HIST("h2dGenSecAntiLambdaVsMultMC_RecoedEvt"), mcCollision.multMCNParticlesEta05(), ptmc);
if (v0MC.pdgCodeMother() == PDG_t::kXiPlusBar) {
histos.fill(HIST("h2dGenSecAntiLambdaFromXiVsMultMC_RecoedEvt"), mcCollision.multMCNParticlesEta05(), ptmc);
}
if (v0MC.pdgCodeMother() == PDG_t::kXiPlusBar || v0MC.pdgCodeMother() == -o2::constants::physics::Pdg::kXi0) {
histos.fill(HIST("h2dGenSecAntiLambdaFromXiAndXi0VsMultMC_RecoedEvt"), mcCollision.multMCNParticlesEta05(), ptmc);
}
if (v0MC.pdgCodeMother() == PDG_t::kOmegaPlusBar) {
histos.fill(HIST("h2dGenSecAntiLambdaFromOmegaVsMultMC_RecoedEvt"), mcCollision.multMCNParticlesEta05(), ptmc);
}
}
}

if (v0MC.pdgCode() == PDG_t::kK0Short) {
histos.fill(HIST("h2dGenSecK0Short"), centrality, ptmc);
histos.fill(HIST("h2dGenSecK0ShortVsMultMC"), mcCollision.multMCNParticlesEta05(), ptmc);
}
if (v0MC.pdgCode() == PDG_t::kLambda0) {
histos.fill(HIST("h2dGenSecLambda"), centrality, ptmc);
histos.fill(HIST("h2dGenSecLambdaVsMultMC"), mcCollision.multMCNParticlesEta05(), ptmc);
if (v0MC.pdgCodeMother() == PDG_t::kXiMinus) {
histos.fill(HIST("h2dGenSecLambdaFromXi"), centrality, ptmc);
histos.fill(HIST("h2dGenSecLambdaFromXiVsMultMC"), mcCollision.multMCNParticlesEta05(), ptmc);
}
if (v0MC.pdgCodeMother() == PDG_t::kXiMinus || v0MC.pdgCodeMother() == o2::constants::physics::Pdg::kXi0) {
histos.fill(HIST("h2dGenSecLambdaFromXiAndXi0"), centrality, ptmc);
histos.fill(HIST("h2dGenSecLambdaFromXiAndXi0VsMultMC"), mcCollision.multMCNParticlesEta05(), ptmc);
}
if (v0MC.pdgCodeMother() == PDG_t::kOmegaMinus) {
histos.fill(HIST("h2dGenSecLambdaFromOmega"), centrality, ptmc);
histos.fill(HIST("h2dGenSecLambdaFromOmegaVsMultMC"), mcCollision.multMCNParticlesEta05(), ptmc);
}
}
if (v0MC.pdgCode() == PDG_t::kLambda0Bar) {
histos.fill(HIST("h2dGenSecAntiLambda"), centrality, ptmc);
histos.fill(HIST("h2dGenSecAntiLambdaVsMultMC"), mcCollision.multMCNParticlesEta05(), ptmc);
if (v0MC.pdgCodeMother() == PDG_t::kXiPlusBar) {
histos.fill(HIST("h2dGenSecAntiLambdaFromXi"), centrality, ptmc);
histos.fill(HIST("h2dGenSecAntiLambdaFromXiVsMultMC"), mcCollision.multMCNParticlesEta05(), ptmc);
}
if (v0MC.pdgCodeMother() == PDG_t::kXiPlusBar || v0MC.pdgCodeMother() == -o2::constants::physics::Pdg::kXi0) {
histos.fill(HIST("h2dGenSecAntiLambdaFromXiAndXi0"), centrality, ptmc);
histos.fill(HIST("h2dGenSecAntiLambdaFromXiAndXi0VsMultMC"), mcCollision.multMCNParticlesEta05(), ptmc);
}
if (v0MC.pdgCodeMother() == PDG_t::kOmegaPlusBar) {
histos.fill(HIST("h2dGenSecAntiLambdaFromOmega"), centrality, ptmc);
histos.fill(HIST("h2dGenSecAntiLambdaFromOmegaVsMultMC"), mcCollision.multMCNParticlesEta05(), ptmc);
}
}
}
}

for (auto const& cascMC : CascMCCores) {
if (!cascMC.has_straMCCollision())
continue;
Expand Down Expand Up @@ -3240,7 +3357,7 @@
}
}

if (doSecondaryV0s && std::abs(cascMC.pdgCodeV0()) == kLambda0) {
if (doSecondaryV0s == 2 && std::abs(cascMC.pdgCodeV0()) == kLambda0) {
float v0PtMc = std::hypot(cascMC.pxPosMC() + cascMC.pxNegMC(), cascMC.pyPosMC() + cascMC.pyNegMC());
float v0RapMc = RecoDecay::y(std::array{cascMC.pxPosMC() + cascMC.pxNegMC(), cascMC.pyPosMC() + cascMC.pyNegMC(), cascMC.pzPosMC() + cascMC.pzNegMC()}, o2::constants::physics::MassLambda);
if (v0Selections.rapidityMinCut < v0RapMc && v0RapMc < v0Selections.rapidityMaxCut) {
Expand Down Expand Up @@ -3315,7 +3432,7 @@
}
}

if (doSecondaryV0s && std::abs(cascMC.pdgCodeV0()) == kLambda0) {
if (doSecondaryV0s == 2 && std::abs(cascMC.pdgCodeV0()) == kLambda0) {
float v0PtMc = std::hypot(cascMC.pxPosMC() + cascMC.pxNegMC(), cascMC.pyPosMC() + cascMC.pyNegMC());
float v0RapMc = RecoDecay::y(std::array{cascMC.pxPosMC() + cascMC.pxNegMC(), cascMC.pyPosMC() + cascMC.pyNegMC(), cascMC.pzPosMC() + cascMC.pzNegMC()}, o2::constants::physics::MassLambda);
if (v0Selections.rapidityMinCut < v0RapMc && v0RapMc < v0Selections.rapidityMaxCut) {
Expand Down
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