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[PWGLF] omega2012Analysis.cxx - improve loop condition #13314

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Merged
dmallick2 merged 2 commits into from
Oct 10, 2025
Merged

[PWGLF] omega2012Analysis.cxx - improve loop condition #13314

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ea7f7bd
update loop
BongHwi Oct 9, 2025
f8dfc2a
fix simple issue
BongHwi Oct 10, 2025
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156 changes: 108 additions & 48 deletions PWGLF/Tasks/Resonances/omega2012Analysis.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,8 @@

#include <Math/Vector4D.h>

#include <set>

using namespace o2;
using namespace o2::framework;
using namespace o2::framework::expressions;
Expand Down Expand Up @@ -129,6 +131,10 @@ struct Omega2012Analysis {
Configurable<std::vector<float>> cPionTOFNSigmaCuts{"cPionTOFNSigmaCuts", {3.0f, 3.0f, 3.0f, 3.0f}, "TOF NSigma cuts per pT bin (pion)"};
Configurable<std::vector<int>> cPionTOFRequired{"cPionTOFRequired", {0, 0, 1, 1}, "Require TOF per pT bin (pion)"};

// Xi1530 mass window cut
Configurable<float> cXi1530Mass{"cXi1530Mass", 1.53, "Xi(1530) mass (GeV/c^2)"};
Configurable<float> cXi1530MassWindow{"cXi1530MassWindow", 0.01, "Xi(1530) mass window (GeV/c^2)"};

// PDG masses
double massK0 = MassK0Short;

Expand Down Expand Up @@ -475,6 +481,21 @@ struct Omega2012Analysis {
return true;
}

// Xi1530 mass window cut
template <typename XiType, typename PionType>
bool xi1530MassCut(const XiType& xi, const PionType& pion)
{
// Calculate Xi + pion invariant mass
ROOT::Math::PxPyPzEVector pXi, pPion, pXi1530;
pXi = ROOT::Math::PxPyPzEVector(ROOT::Math::PtEtaPhiMVector(xi.pt(), xi.eta(), xi.phi(), xi.mXi()));
pPion = ROOT::Math::PxPyPzEVector(ROOT::Math::PtEtaPhiMVector(pion.pt(), pion.eta(), pion.phi(), MassPionCharged));
pXi1530 = pXi + pPion;

// Check if mass is within Xi(1530) window
float massDiff = std::abs(pXi1530.M() - cXi1530Mass);
return massDiff < cXi1530MassWindow;
}

// Primary-level cascade kinematics
template <typename CascT>
bool cascprimaryTrackCut(const CascT& c)
Expand Down Expand Up @@ -801,67 +822,106 @@ struct Omega2012Analysis {
{
auto cent = collision.cent();

// Collect track IDs used in xi and v0 construction to exclude them from pion selection
std::set<int> usedTrackIds;

// Collect track IDs from xi cascades
for (const auto& xi : cascades) {
if (!cascprimaryTrackCut(xi))
continue;
if (!casctopCut(xi))
continue;

for (const auto& v0 : v0s) {
if (!v0CutEnhanced(collision, v0))
// Add xi daughter track IDs from cascadeIndices array (ordered: positive, negative, bachelor)
auto cascIndices = xi.cascadeIndices();
usedTrackIds.insert(cascIndices[0]); // positive track
usedTrackIds.insert(cascIndices[1]); // negative track
usedTrackIds.insert(cascIndices[2]); // bachelor track
}

// Collect track IDs from v0s
for (const auto& v0 : v0s) {
if (!v0CutEnhanced(collision, v0))
continue;

// Add v0 daughter track IDs from indices array
auto v0Indices = v0.indices();
usedTrackIds.insert(v0Indices[0]); // positive track
usedTrackIds.insert(v0Indices[1]); // negative track
}

// First loop: xi + pion to check xi1530 mass window
for (const auto& xi : cascades) {
if (!cascprimaryTrackCut(xi))
continue;
if (!casctopCut(xi))
continue;

for (const auto& pion : tracks) {
// Skip pion tracks that are already used in xi construction
if (usedTrackIds.find(pion.globalIndex()) != usedTrackIds.end()) {
continue;
}

// Pion QA before cuts
histos.fill(HIST("QAbefore/pionPt"), pion.pt());
histos.fill(HIST("QAbefore/pionEta"), pion.eta());

for (const auto& pion : tracks) {
// Pion QA before cuts
histos.fill(HIST("QAbefore/pionPt"), pion.pt());
histos.fill(HIST("QAbefore/pionEta"), pion.eta());

if constexpr (IsResoMicrotrack) {
histos.fill(HIST("QAbefore/pionDCAxy"), pion.pt(), o2::aod::resomicrodaughter::ResoMicroTrackSelFlag::decodeDCAxy(pion.trackSelectionFlags()));
histos.fill(HIST("QAbefore/pionDCAz"), pion.pt(), o2::aod::resomicrodaughter::ResoMicroTrackSelFlag::decodeDCAz(pion.trackSelectionFlags()));
histos.fill(HIST("QAbefore/pionTPCNSigma"), pion.pt(), o2::aod::resomicrodaughter::PidNSigma::getTPCnSigma(pion.pidNSigmaPiFlag()));
if (pion.hasTOF()) {
histos.fill(HIST("QAbefore/pionTOFNSigma"), pion.pt(), o2::aod::resomicrodaughter::PidNSigma::getTOFnSigma(pion.pidNSigmaPiFlag()));
}
} else {
histos.fill(HIST("QAbefore/pionDCAxy"), pion.pt(), pion.dcaXY());
histos.fill(HIST("QAbefore/pionDCAz"), pion.pt(), pion.dcaZ());
histos.fill(HIST("QAbefore/pionTPCNSigma"), pion.pt(), pion.tpcNSigmaPi());
if (pion.hasTOF()) {
histos.fill(HIST("QAbefore/pionTOFNSigma"), pion.pt(), pion.tofNSigmaPi());
}
if constexpr (requires { pion.tpcNClsFound(); }) {
histos.fill(HIST("QAbefore/pionTPCNcls"), pion.tpcNClsFound());
}
if constexpr (IsResoMicrotrack) {
histos.fill(HIST("QAbefore/pionDCAxy"), pion.pt(), o2::aod::resomicrodaughter::ResoMicroTrackSelFlag::decodeDCAxy(pion.trackSelectionFlags()));
histos.fill(HIST("QAbefore/pionDCAz"), pion.pt(), o2::aod::resomicrodaughter::ResoMicroTrackSelFlag::decodeDCAz(pion.trackSelectionFlags()));
histos.fill(HIST("QAbefore/pionTPCNSigma"), pion.pt(), o2::aod::resomicrodaughter::PidNSigma::getTPCnSigma(pion.pidNSigmaPiFlag()));
if (pion.hasTOF()) {
histos.fill(HIST("QAbefore/pionTOFNSigma"), pion.pt(), o2::aod::resomicrodaughter::PidNSigma::getTOFnSigma(pion.pidNSigmaPiFlag()));
}
} else {
histos.fill(HIST("QAbefore/pionDCAxy"), pion.pt(), pion.dcaXY());
histos.fill(HIST("QAbefore/pionDCAz"), pion.pt(), pion.dcaZ());
histos.fill(HIST("QAbefore/pionTPCNSigma"), pion.pt(), pion.tpcNSigmaPi());
if (pion.hasTOF()) {
histos.fill(HIST("QAbefore/pionTOFNSigma"), pion.pt(), pion.tofNSigmaPi());
}
if constexpr (requires { pion.tpcNClsFound(); }) {
histos.fill(HIST("QAbefore/pionTPCNcls"), pion.tpcNClsFound());
}
}

if (!pionCut<IsResoMicrotrack>(pion))
continue;
if (!pionCut<IsResoMicrotrack>(pion))
continue;

// Pion QA after cuts
histos.fill(HIST("QAafter/pionPt"), pion.pt());
histos.fill(HIST("QAafter/pionEta"), pion.eta());

if constexpr (IsResoMicrotrack) {
histos.fill(HIST("QAafter/pionDCAxy"), pion.pt(), o2::aod::resomicrodaughter::ResoMicroTrackSelFlag::decodeDCAxy(pion.trackSelectionFlags()));
histos.fill(HIST("QAafter/pionDCAz"), pion.pt(), o2::aod::resomicrodaughter::ResoMicroTrackSelFlag::decodeDCAz(pion.trackSelectionFlags()));
histos.fill(HIST("QAafter/pionTPCNSigma"), pion.pt(), o2::aod::resomicrodaughter::PidNSigma::getTPCnSigma(pion.pidNSigmaPiFlag()));
if (pion.hasTOF()) {
histos.fill(HIST("QAafter/pionTOFNSigma"), pion.pt(), o2::aod::resomicrodaughter::PidNSigma::getTOFnSigma(pion.pidNSigmaPiFlag()));
}
} else {
histos.fill(HIST("QAafter/pionDCAxy"), pion.pt(), pion.dcaXY());
histos.fill(HIST("QAafter/pionDCAz"), pion.pt(), pion.dcaZ());
histos.fill(HIST("QAafter/pionTPCNSigma"), pion.pt(), pion.tpcNSigmaPi());
if (pion.hasTOF()) {
histos.fill(HIST("QAafter/pionTOFNSigma"), pion.pt(), pion.tofNSigmaPi());
}
if constexpr (requires { pion.tpcNClsFound(); }) {
histos.fill(HIST("QAafter/pionTPCNcls"), pion.tpcNClsFound());
}
// Pion QA after cuts
histos.fill(HIST("QAafter/pionPt"), pion.pt());
histos.fill(HIST("QAafter/pionEta"), pion.eta());

if constexpr (IsResoMicrotrack) {
histos.fill(HIST("QAafter/pionDCAxy"), pion.pt(), o2::aod::resomicrodaughter::ResoMicroTrackSelFlag::decodeDCAxy(pion.trackSelectionFlags()));
histos.fill(HIST("QAafter/pionDCAz"), pion.pt(), o2::aod::resomicrodaughter::ResoMicroTrackSelFlag::decodeDCAz(pion.trackSelectionFlags()));
histos.fill(HIST("QAafter/pionTPCNSigma"), pion.pt(), o2::aod::resomicrodaughter::PidNSigma::getTPCnSigma(pion.pidNSigmaPiFlag()));
if (pion.hasTOF()) {
histos.fill(HIST("QAafter/pionTOFNSigma"), pion.pt(), o2::aod::resomicrodaughter::PidNSigma::getTOFnSigma(pion.pidNSigmaPiFlag()));
}
} else {
histos.fill(HIST("QAafter/pionDCAxy"), pion.pt(), pion.dcaXY());
histos.fill(HIST("QAafter/pionDCAz"), pion.pt(), pion.dcaZ());
histos.fill(HIST("QAafter/pionTPCNSigma"), pion.pt(), pion.tpcNSigmaPi());
if (pion.hasTOF()) {
histos.fill(HIST("QAafter/pionTOFNSigma"), pion.pt(), pion.tofNSigmaPi());
}
if constexpr (requires { pion.tpcNClsFound(); }) {
histos.fill(HIST("QAafter/pionTPCNcls"), pion.tpcNClsFound());
}
}

// Check xi1530 mass window cut
if (!xi1530MassCut(xi, pion))
continue;

// Second loop: v0 for the selected xi-pion pair
for (const auto& v0 : v0s) {
if (!v0CutEnhanced(collision, v0))
continue;

// 4-vectors for 3-body
// 4-vectors for 3-body decay: Xi + K0s + pion
ROOT::Math::PxPyPzEVector pXi, pK0s, pPion, pRes;
pXi = ROOT::Math::PxPyPzEVector(ROOT::Math::PtEtaPhiMVector(xi.pt(), xi.eta(), xi.phi(), xi.mXi()));
pK0s = ROOT::Math::PxPyPzEVector(ROOT::Math::PtEtaPhiMVector(v0.pt(), v0.eta(), v0.phi(), massK0));
Expand Down
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