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[PWGLF] Fixed misidentification bug #14313

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Merged
dmallick2 merged 1 commit into from
Dec 22, 2025
+23 −21
Merged

[PWGLF] Fixed misidentification bug #14313

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44 changes: 23 additions & 21 deletions PWGLF/Tasks/Resonances/kstar892LightIon.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1498,7 +1498,18 @@ struct Kstar892LightIon {
return;
}

centrality = collision.centFT0M();
if (selectCentEstimator == kFT0M) {
centrality = collision.centFT0M();
} else if (selectCentEstimator == kFT0A) {
centrality = collision.centFT0A();
} else if (selectCentEstimator == kFT0C) {
centrality = collision.centFT0C();
} else if (selectCentEstimator == kFV0A) {
centrality = collision.centFV0A();
} else {
centrality = collision.centFT0M(); // default
}

if (!selectionEvent(collision, false)) {
return;
}
Expand All @@ -1508,7 +1519,7 @@ struct Kstar892LightIon {
if (!selectionTrack(track1) || !selectionTrack(track2))
continue;

if (track1.index() == track2.index())
if (track1.index() >= track2.index())
continue;

if (track1.sign() * track2.sign() >= 0)
Expand All @@ -1531,31 +1542,22 @@ struct Kstar892LightIon {
if (!ok1 || !ok2)
continue;

ROOT::Math::PxPyPzMVector p1(track1.px(), track1.py(), track1.pz(), pdg1 == PDG_t::kPiPlus ? massPi : massKa);
ROOT::Math::PxPyPzMVector p2(track2.px(), track2.py(), track2.pz(), pdg2 == PDG_t::kPiPlus ? massPi : massKa);

if (pdg1 == PDG_t::kPiPlus) {
// pi-pi misidentification
if (pdg1 == PDG_t::kPiPlus && pdg2 == PDG_t::kPiPlus) {
ROOT::Math::PxPyPzMVector p1Fake(track1.px(), track1.py(), track1.pz(), massKa);
auto misIDMother = p1Fake + p2;
hMC.fill(HIST("RecMisID/hMassMisID"), centrality, misIDMother.Pt(), misIDMother.M());
}
ROOT::Math::PxPyPzMVector p2True(track2.px(), track2.py(), track2.pz(), massPi);

if (pdg2 == PDG_t::kPiPlus) {
ROOT::Math::PxPyPzMVector p2Fake(track2.px(), track2.py(), track2.pz(), massKa);
auto misIDMother = p1 + p2Fake;
hMC.fill(HIST("RecMisID/hMassMisID"), centrality, misIDMother.Pt(), misIDMother.M());
auto misIDMother = p1Fake + p2True;
hMC.fill(HIST("RecMisID/hMassMisID"), misIDMother.Pt(), centrality, misIDMother.M());
}

if (pdg1 == PDG_t::kKPlus) {
// KK misidentification
if (pdg1 == PDG_t::kKPlus && pdg2 == PDG_t::kKPlus) {
ROOT::Math::PxPyPzMVector p1Fake(track1.px(), track1.py(), track1.pz(), massPi);
auto misIDMother = p1Fake + p2;
hMC.fill(HIST("RecMisID/hMassMisID"), centrality, misIDMother.Pt(), misIDMother.M());
}
ROOT::Math::PxPyPzMVector p2True(track2.px(), track2.py(), track2.pz(), massKa);

if (pdg2 == PDG_t::kKPlus) {
ROOT::Math::PxPyPzMVector p2Fake(track2.px(), track2.py(), track2.pz(), massPi);
auto misIDMother = p1 + p2Fake;
hMC.fill(HIST("RecMisID/hMassMisID"), centrality, misIDMother.Pt(), misIDMother.M());
auto misIDMother = p1Fake + p2True;
hMC.fill(HIST("RecMisID/hMassMisID"), misIDMother.Pt(), centrality, misIDMother.M());
}
}
}
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