[PWGCF] Femto: add Lc support to the femto framework - #17424
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Please consider the following formatting changes to AliceO2Group#17424
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Error while checking build/O2Physics/code-check for 08c0583 at 2026-08-13 00:13: Full log here. |
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Adds Lc baryons as a new particle species to the unified femto framework, enabling
Lc-hadron femtoscopic correlations.
Data model - four new tables:
FLcs- kinematics, mass of the accepted hypothesis and the three daughter indicesFLcMasks- selection bitmaskFLcExtras- QA/debug: mass of the competing hypothesis, three-prong topologicalvariables, BDT scores and the PWGHF selection flags
FLcLabels- MC labelsCore:
charmHadronBuilder.handcharmHadronHistManager.hextended to thethree-prong topology, so both species share the same builder and histogram manager.
Lc candidates are taken from PWGHF (
HfCand3Prong), with the acceptance applied asa rapidity cut via
HfHelper. Unlike D0, the sign of the stored signed pT is thephysical baryon charge, taken from the charge of the first prong - the PWGHF flags
only tell which mass assignment passed. Prongs are stored remapped onto the accepted
hypothesis, so
Prong0Daualways points at the proton.The naming of everything shared by the family was generalised from D0 to charm
hadron (
ConfD0Filters->ConfCharmHadronFilters,fillD0s->fillCharmHadrons,and so on). Species-level names (
D0Bits,D0Selection1) are unchanged.Tasks: the two D0 workflows now cover the whole family.
femto-charm-hadron-qa(wasfemto-d0-qa) - QA for D0 and Lc candidatesand their daughters
femto-pair-track-charm-hadron(wasfemto-pair-track-d0) - D0-hadron andLc-hadron correlations, same and mixed event
JSON prefixes changed accordingly:
D0Filters->CharmHadronFilters,D0Tables->CharmHadronTables.Pairs:
TrackLcPairCleanerandClosePairRejectionTrackLcare new.MC: Lc candidates have no direct MC label, so the three prongs are
matched to a generated Lc -> p K pi decay with
RecoDecay::getMatchedMCRec.Mass hypotheses: an Lc candidate can pass both the pKpi and the piKp hypothesis.
One row is stored per accepted hypothesis, so such a candidate appears twice, each
row with its own mass and prong assignment.
CharmHadronFilters.rejectAmbiguousHypothesisallows dropping them entirely.