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[PWGCF] FemtoUniverse V0 Task -- changed combinations policy for v0v0 and improved v0 duplicates check #14672

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Merged
prchakra merged 2 commits into from
Jan 28, 2026
+38 −40
Merged

[PWGCF] FemtoUniverse V0 Task -- changed combinations policy for v0v0 and improved v0 duplicates check #14672

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153135e
changed combinations policy for v0v0 and improved v0 duplicates check
Jan 28, 2026
4305946
modified pair process function to identify both V0s alternatively
Jan 28, 2026
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78 changes: 38 additions & 40 deletions PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackV0Extended.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -167,6 +167,7 @@ struct FemtoUniversePairTaskTrackV0Extended {
EfficiencyCorrection effCorrection{&effCorConfGroup};

static constexpr unsigned int V0ChildTable[][2] = {{0, 1}, {1, 0}, {1, 1}}; // Table to select the V0 children
static constexpr double v0InvMass[] = {1.115, 1.115, 0.497}; // Table to select invariant mass of V0s

FemtoUniverseContainer<femto_universe_container::EventType::same, femto_universe_container::Observable::kstar> sameEventCont;
FemtoUniverseContainer<femto_universe_container::EventType::mixed, femto_universe_container::Observable::kstar> mixedEventCont;
Expand Down Expand Up @@ -584,45 +585,42 @@ struct FemtoUniversePairTaskTrackV0Extended {
return;
// track cleaning & checking for duplicate pairs
if (!pairCleanerV0.isCleanPair(p1, p2, parts)) {
// mark for rejection the cascades that share a daughter with other cascades
v0Duplicates.insert(p1.globalIndex());
v0Duplicates.insert(p2.globalIndex());
// mark for rejection the cascade that shares a daughter with another cascade and has an invariant mass further from default value
if (std::abs(p1.mLambda() - v0InvMass[ConfV0Selection.confV0Type1]) < std::abs(p2.mLambda() - v0InvMass[ConfV0Selection.confV0Type2])) {
v0Duplicates.insert(p2.globalIndex());
} else {
v0Duplicates.insert(p1.globalIndex());
}
}
};

auto pairProcessFunc = [&](auto& p1, auto& p2) -> void {
auto pairProcessFunc = [&](auto& p1, auto& p2) -> bool {
if (v0Duplicates.contains(p1.globalIndex()) || v0Duplicates.contains(p2.globalIndex()))
return;
return false;
// Lambda invariant mass cut for p1
if (!invMLambda(p1.mLambda(), p1.mAntiLambda()))
return;
return false;
// Lambda invariant mass cut for p2
if (!invMLambda(p2.mLambda(), p2.mAntiLambda()))
return;
if (confIsCPR.value) {
if (confRectV0V0CPR && pairCloseRejectionV0.isClosePair<true>(p1, p2, parts, magFieldTesla, femto_universe_container::EventType::same)) {
return;
} else if (!confRectV0V0CPR && pairCloseRejectionV0.isClosePair<false>(p1, p2, parts, magFieldTesla, femto_universe_container::EventType::same)) {
return;
}
}
return false;

const auto& posChild1 = parts.iteratorAt(p1.globalIndex() - 2 - parts.begin().globalIndex());
const auto& negChild1 = parts.iteratorAt(p1.globalIndex() - 1 - parts.begin().globalIndex());
/// p1 daughters that do not pass this condition are not selected
if constexpr (std::experimental::is_detected<hasSigma, typename PartType::iterator>::value) {
if (!isParticleTPC(posChild1, V0ChildTable[ConfV0Selection.confV0Type1][0]) || !isParticleTPC(negChild1, V0ChildTable[ConfV0Selection.confV0Type1][1]))
return;
return false;
if (!isParticleTOF(posChild1, V0ChildTable[ConfV0Selection.confV0Type1][0]) || !isParticleTOF(negChild1, V0ChildTable[ConfV0Selection.confV0Type1][1]))
return;
return false;
} else {
if ((posChild1.pidCut() & (1u << V0ChildTable[ConfV0Selection.confV0Type1][0])) == 0 || (negChild1.pidCut() & (1u << V0ChildTable[ConfV0Selection.confV0Type1][1])) == 0)
return;
return false;
if (ConfV0Selection.confUseStrangenessTOF) {
if (((ConfV0Selection.confV0Type1 == 0) && (p1.pidCut() & 3) != 3) || ((ConfV0Selection.confV0Type1 == 1) && (p1.pidCut() & 12) != 12) || ((ConfV0Selection.confV0Type1 == 2) && (p1.pidCut() & 48) != 48))
return;
return false;
} else {
if ((posChild1.pidCut() & (8u << V0ChildTable[ConfV0Selection.confV0Type1][0])) == 0 || (negChild1.pidCut() & (8u << V0ChildTable[ConfV0Selection.confV0Type1][1])) == 0)
return;
return false;
}
}

Expand All @@ -631,44 +629,44 @@ struct FemtoUniversePairTaskTrackV0Extended {
/// p2 daughters that do not pass this condition are not selected
if constexpr (std::experimental::is_detected<hasSigma, typename PartType::iterator>::value) {
if (!isParticleTPC(posChild2, V0ChildTable[ConfV0Selection.confV0Type2][0]) || !isParticleTPC(negChild2, V0ChildTable[ConfV0Selection.confV0Type2][1]))
return;
return false;
if (!isParticleTOF(posChild2, V0ChildTable[ConfV0Selection.confV0Type2][0]) || !isParticleTOF(negChild2, V0ChildTable[ConfV0Selection.confV0Type2][1]))
return;
return false;
} else {
if ((posChild2.pidCut() & (1u << V0ChildTable[ConfV0Selection.confV0Type2][0])) == 0 || (negChild2.pidCut() & (1u << V0ChildTable[ConfV0Selection.confV0Type2][1])) == 0)
return;
return false;
if (ConfV0Selection.confUseStrangenessTOF) {
if (((ConfV0Selection.confV0Type2 == 0) && (p2.pidCut() & 3) != 3) || ((ConfV0Selection.confV0Type2 == 1) && (p2.pidCut() & 12) != 12) || ((ConfV0Selection.confV0Type2 == 2) && (p2.pidCut() & 48) != 48))
return;
return false;
} else {
if ((posChild2.pidCut() & (8u << V0ChildTable[ConfV0Selection.confV0Type2][0])) == 0 || (negChild2.pidCut() & (8u << V0ChildTable[ConfV0Selection.confV0Type2][1])) == 0)
return;
return false;
}
}

if (confIsCPR.value) {
if (confRectV0V0CPR && pairCloseRejectionV0.isClosePair<true>(p1, p2, parts, magFieldTesla, femto_universe_container::EventType::same)) {
return false;
} else if (!confRectV0V0CPR && pairCloseRejectionV0.isClosePair<false>(p1, p2, parts, magFieldTesla, femto_universe_container::EventType::same)) {
return false;
}
}

if constexpr (std::is_same<PartType, FemtoRecoParticles>::value)
sameEventCont.setPair<true>(p1, p2, multCol, confUse3D);
else
sameEventCont.setPair<false>(p1, p2, multCol, confUse3D);
return true;
};

v0Duplicates.clear();
if (ConfV0Selection.confV0Type1 == ConfV0Selection.confV0Type2) {
for (const auto& [p1, p2] : combinations(CombinationsStrictlyUpperIndexPolicy(groupPartsTwo, groupPartsTwo))) {
pairDuplicateCheckFunc(p1, p2);
}
/// Now build the combinations for identical V0s
for (const auto& [p1, p2] : combinations(CombinationsStrictlyUpperIndexPolicy(groupPartsTwo, groupPartsTwo))) {
pairProcessFunc(p1, p2);
}
} else {
for (const auto& [p1, p2] : combinations(CombinationsFullIndexPolicy(groupPartsTwo, groupPartsTwo))) {
pairDuplicateCheckFunc(p1, p2);
}
/// Now build the combinations for non-identical V0s
for (const auto& [p1, p2] : combinations(CombinationsFullIndexPolicy(groupPartsTwo, groupPartsTwo))) {
pairProcessFunc(p1, p2);
}
for (const auto& [p1, p2] : combinations(CombinationsStrictlyUpperIndexPolicy(groupPartsTwo, groupPartsTwo))) {
pairDuplicateCheckFunc(p1, p2);
}
/// Now build the combinations for V0s
for (const auto& [p1, p2] : combinations(CombinationsStrictlyUpperIndexPolicy(groupPartsTwo, groupPartsTwo))) {
if (!pairProcessFunc(p1, p2))
pairProcessFunc(p2, p1);
}
}

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