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[PWGHF] XicToXiPiPi: Add DecayLengthMcGen column #12627

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Merged
vkucera merged 3 commits into from
Aug 21, 2025
Merged

[PWGHF] XicToXiPiPi: Add DecayLengthMcGen column #12627

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3aa1446
Add a variable of the generated particle to the tree for QA
JaeYoonCHO Aug 18, 2025
cd96dc0
Replace double[3] arrays with std::array
JaeYoonCHO Aug 20, 2025
2ed8131
Address reviewer's comments
JaeYoonCHO Aug 20, 2025
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4 changes: 3 additions & 1 deletion PWGHF/DataModel/CandidateReconstructionTables.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1905,6 +1905,7 @@ DECLARE_SOA_COLUMN(FlagMcMatchRec, flagMcMatchRec, int8_t); // reconstruction le
DECLARE_SOA_COLUMN(FlagMcMatchGen, flagMcMatchGen, int8_t); // generator level
DECLARE_SOA_COLUMN(OriginMcRec, originMcRec, int8_t);
DECLARE_SOA_COLUMN(OriginMcGen, originMcGen, int8_t);
DECLARE_SOA_COLUMN(DecayLengthMcGen, decayLengthMcGen, float);
// Residuals and pulls
DECLARE_SOA_COLUMN(PtResidual, ptResidual, float);
DECLARE_SOA_COLUMN(PResidual, pResidual, float);
Expand Down Expand Up @@ -2012,7 +2013,8 @@ DECLARE_SOA_TABLE(HfCandXicMcRec, "AOD", "HFCANDXICMCREC",
DECLARE_SOA_TABLE(HfCandXicMcGen, "AOD", "HFCANDXICMCGEN",
hf_cand_xic_to_xi_pi_pi::FlagMcMatchGen,
hf_cand_xic_to_xi_pi_pi::OriginMcGen,
hf_cand::PdgBhadMotherPart);
hf_cand::PdgBhadMotherPart,
hf_cand_xic_to_xi_pi_pi::DecayLengthMcGen);

// table with residuals and pulls of PV
DECLARE_SOA_TABLE(HfCandXicResid, "AOD", "HFCANDXICRESID",
Expand Down
12 changes: 9 additions & 3 deletions PWGHF/TableProducer/candidateCreatorXicToXiPiPi.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -912,6 +912,7 @@ struct HfCandidateCreatorXicToXiPiPiExpressions {
int8_t sign = 0;
int8_t flag = 0;
int8_t origin = RecoDecay::OriginType::None;
float decayLengthGen = -999.f;
int8_t nPionsDecayed = 0;
int8_t nInteractionsWithMaterial = 0;
// for resonance matching
Expand Down Expand Up @@ -1088,7 +1089,7 @@ struct HfCandidateCreatorXicToXiPiPiExpressions {
if (rejectionMask != 0) {
// at least one event selection not satisfied --> reject all particles from this collision
for (unsigned int i = 0; i < mcParticlesPerMcColl.size(); ++i) {
rowMcMatchGen(-99, -99, -99);
rowMcMatchGen(-99, -99, -99, decayLengthGen);
}
continue;
}
Expand Down Expand Up @@ -1134,13 +1135,18 @@ struct HfCandidateCreatorXicToXiPiPiExpressions {
// Check whether the charm baryon is non-prompt (from a b quark).
if (flag != 0) {
origin = RecoDecay::getCharmHadronOrigin(mcParticles, particle, false, &idxBhadMothers);
// Calculate the decay length of the generated particle
auto dau0 = particle.template daughters_as<aod::McParticles>().begin();
std::array<double, 3> vtxDau = {dau0.vx(), dau0.vy(), dau0.vz()};
std::array<double, 3> vtxPV = {mcCollision.posX(), mcCollision.posY(), mcCollision.posZ()};
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decayLengthGen = RecoDecay::distance(vtxPV, vtxDau);
}
// Fill table
if (origin == RecoDecay::OriginType::NonPrompt) {
auto bHadMother = mcParticles.rawIteratorAt(idxBhadMothers[0]);
rowMcMatchGen(flag, origin, bHadMother.pdgCode());
rowMcMatchGen(flag, origin, bHadMother.pdgCode(), decayLengthGen);
} else {
rowMcMatchGen(flag, origin, 0);
rowMcMatchGen(flag, origin, 0, decayLengthGen);
}
} // close loop over generated particles
} // close loop over McCollisions
Expand Down
9 changes: 6 additions & 3 deletions PWGHF/TableProducer/treeCreatorXicToXiPiPi.cxx
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Expand Up @@ -334,7 +334,8 @@ DECLARE_SOA_TABLE(HfCandXicToXiPiPiFullPs, "AOD", "HFXICXI2PIFULLP",
full::Pt,
full::Eta,
full::Phi,
full::Y);
full::Y,
hf_cand_xic_to_xi_pi_pi::DecayLengthMcGen);
} // namespace o2::aod

/// Writes the full information in an output TTree
Expand Down Expand Up @@ -723,7 +724,8 @@ struct HfTreeCreatorXicToXiPiPi {
particle.pt(),
particle.eta(),
particle.phi(),
RecoDecay::y(particle.pVector(), o2::constants::physics::MassXiCPlus));
RecoDecay::y(particle.pVector(), o2::constants::physics::MassXiCPlus),
particle.decayLengthMcGen());
}
}
}
Expand Down Expand Up @@ -776,7 +778,8 @@ struct HfTreeCreatorXicToXiPiPi {
particle.pt(),
particle.eta(),
particle.phi(),
RecoDecay::y(particle.pVector(), o2::constants::physics::MassXiCPlus));
RecoDecay::y(particle.pVector(), o2::constants::physics::MassXiCPlus),
particle.decayLengthMcGen());
}
}
}
Expand Down
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