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[PWGHF] Fix trigger daughter rejection logic in MCGen of the D0-hadron correlator #16509

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singhra1994 merged 1 commit into from
Jun 2, 2026
+8 −0
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[PWGHF] Fix trigger daughter rejection logic in MCGen of the D0-hadron correlator #16509

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8 changes: 8 additions & 0 deletions PWGHF/HFC/TableProducer/correlatorD0Hadrons.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -966,6 +966,14 @@ struct HfCorrelatorD0Hadrons {
if (!particleAssoc.isPhysicalPrimary()) {
continue;
}

// Explicitly reject direct daughters of the current trigger D0/D0bar.
auto const motherIdxD0 = RecoDecay::getMother(mcParticles, particleAssoc, Pdg::kD0, true, nullptr, 1);
auto const motherIdxD0bar = RecoDecay::getMother(mcParticles, particleAssoc, -Pdg::kD0, true, nullptr, 1);
if (motherIdxD0 == particleTrigg.globalIndex() || motherIdxD0bar == particleTrigg.globalIndex()) {
continue;
}

// ==============================soft pion removal================================
registry.fill(HIST("hTrackCounter"), 1); // fill before soft pi removal
// method used: indexMother = -1 by default if the mother doesn't match with given PID of the mother. We find mother of pion if it is D* and mother of D0 if it is D*. If they are both positive and they both match each other, then it is detected as a soft pion
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