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[PWGHF] Fix PID assignment in Xic0 and Omegac0 candidate creator #16352

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Merged
fcatalan92 merged 3 commits into from
May 26, 2026
+37 −6
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[PWGHF] Fix PID assignment in Xic0 and Omegac0 candidate creator #16352

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c00e930
Fix PID assignment in Xic0 and Omegac0 candidate creator
mtorresc15 May 20, 2026
9dc3218
Fix PID assignment in Xic0 and Omegac0 candidate creator
mtorresc15 May 22, 2026
ad37c71
Use ROOT PDG constants for KF track PID mapping
mtorresc15 May 25, 2026
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43 changes: 37 additions & 6 deletions PWGHF/TableProducer/candidateCreatorXic0Omegac0.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,28 @@ enum McMatchFlag : uint8_t {
V0Unmatched
};

// Convert the absolute KFParticle PDG code to the O2 track PID enum needed by getTrackParCovFromKFP()
o2::track::PID::ID getTrackPIDFromPDG(const int pdg)
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@vkucera vkucera May 22, 2026

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There is no way this conversion does not exist in some common utilities yet.

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@fcatalan92 fcatalan92 May 25, 2026

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@vkucera I had a quick look in O2 and O2Physics and I didn't find any common utility. Similar functions are defined in a couple of other places (

O2Physics/Common/TableProducer/PID/pidTPCBase.h

Line 49 in 9eebc16

int getPIDIndex(const int pdgCode) // Get O2 PID index corresponding to MC PDG code
and

O2Physics/Common/Tools/PID/pidTPCModule.h

Line 142 in 9eebc16

int getPIDIndex(const int pdgCode) // Get O2 PID index corresponding to MC PDG code
).
Do you have a concrete common utility that could be used?

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@vkucera vkucera May 26, 2026

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Thanks for the links. I expected this to already exist somewhere close to the declaration of the o2::track::PID::ID but it seems I was wrong.

{
switch (std::abs(pdg)) {
case kPiPlus:
return o2::track::PID::Pion;
case kKPlus:
return o2::track::PID::Kaon;
case kProton:
return o2::track::PID::Proton;
case kLambda0:
return o2::track::PID::Lambda;
case kXiMinus:
return o2::track::PID::XiMinus;
case kOmegaMinus:
return o2::track::PID::OmegaMinus;
default:
LOGF(fatal, "Unsupported PDG code %d in getTrackPIDFromPDG()", pdg);
return o2::track::PID::Pion;
}
}

// Reconstruction of omegac0 and xic0 candidates
struct HfCandidateCreatorXic0Omegac0 {
Produces<aod::HfCandToXiPi> rowCandToXiPi;
Expand Down Expand Up @@ -959,12 +981,16 @@ struct HfCandidateCreatorXic0Omegac0 {

omegaDauChargedTrackParCov = getTrackParCovFromKFP(kfBachKaonToOmega, o2::track::PID::Kaon, bachCharge); // Cascade bach kaon
omegaDauChargedTrackParCov.setAbsCharge(1);
o2::track::TrackParCov trackCasc = getTrackParCovFromKFP(kfOmegaToOmegaC, kfOmegaToOmegaC.GetPDG(), bachCharge);
o2::track::PID::ID pidCasc = getTrackPIDFromPDG(kfOmegaToOmegaC.GetPDG());
o2::track::TrackParCov trackCasc = getTrackParCovFromKFP(kfOmegaToOmegaC, pidCasc, bachCharge);
trackCasc.setAbsCharge(1);

trackParCovV0Dau0 = getTrackParCovFromKFP(kfPos, kfPos.GetPDG(), 1); // V0 postive daughter
o2::track::PID::ID pidV0Dau0 = getTrackPIDFromPDG(kfPos.GetPDG());
trackParCovV0Dau0 = getTrackParCovFromKFP(kfPos, pidV0Dau0, +1); // V0 postive daughter
trackParCovV0Dau0.setAbsCharge(1);
trackParCovV0Dau1 = getTrackParCovFromKFP(kfNeg, kfNeg.GetPDG(), -1); // V0 negtive daughter

o2::track::PID::ID pidV0Dau1 = getTrackPIDFromPDG(kfNeg.GetPDG());
trackParCovV0Dau1 = getTrackParCovFromKFP(kfNeg, pidV0Dau1, -1); // V0 negative daughter
trackParCovV0Dau1.setAbsCharge(1);

//-------------------------- V0 info---------------------------
Expand Down Expand Up @@ -1452,12 +1478,17 @@ struct HfCandidateCreatorXic0Omegac0 {

xiDauChargedTrackParCov = getTrackParCovFromKFP(kfBachPionToXi, o2::track::PID::Pion, bachCharge); // Cascade bach pion
xiDauChargedTrackParCov.setAbsCharge(1);
o2::track::TrackParCov trackCasc = getTrackParCovFromKFP(kfXiToXiC, kfXiToXiC.GetPDG(), bachCharge);

o2::track::PID::ID pidCasc = getTrackPIDFromPDG(kfXiToXiC.GetPDG());
o2::track::TrackParCov trackCasc = getTrackParCovFromKFP(kfXiToXiC, pidCasc, bachCharge);
trackCasc.setAbsCharge(1);

trackParCovV0Dau0 = getTrackParCovFromKFP(kfPos, kfPos.GetPDG(), 1); // V0 postive daughter
o2::track::PID::ID pidV0Dau0 = getTrackPIDFromPDG(kfPos.GetPDG());
trackParCovV0Dau0 = getTrackParCovFromKFP(kfPos, pidV0Dau0, +1); // V0 postive daughter
trackParCovV0Dau0.setAbsCharge(1);
trackParCovV0Dau1 = getTrackParCovFromKFP(kfNeg, kfNeg.GetPDG(), -1); // V0 negtive daughter

o2::track::PID::ID pidV0Dau1 = getTrackPIDFromPDG(kfNeg.GetPDG());
trackParCovV0Dau1 = getTrackParCovFromKFP(kfNeg, pidV0Dau1, -1); // V0 negative daughter
trackParCovV0Dau1.setAbsCharge(1);

//-------------------------- V0 info---------------------------
Expand Down
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