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[ALICE3] set trackParCov pid before fasttracker smearing #15056

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Merged
njacazio merged 1 commit into from
Feb 20, 2026
+39 −6
Merged

[ALICE3] set trackParCov pid before fasttracker smearing #15056

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45 changes: 39 additions & 6 deletions ALICE3/TableProducer/OTF/onTheFlyTracker.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@
#include <Framework/StaticFor.h>
#include <Framework/runDataProcessing.h>
#include <ReconstructionDataFormats/DCA.h>
#include <ReconstructionDataFormats/PID.h>
#include <SimulationDataFormat/InteractionSampler.h>

#include <TGenPhaseSpace.h>
Expand Down Expand Up @@ -597,6 +598,31 @@ struct OnTheFlyTracker {
gRandom->SetSeed(seed);
}

/// Function to get the internal PID for a given pdgCode
/// \param pdgCode pdg code for a common particle (particle handled by the tracker)
int pdgCodeToPID(int pdgCode) const
{
if (std::abs(pdgCode) == PDG_t::kElectron) {
return o2::track::PID::Electron;
} else if (std::abs(pdgCode) == PDG_t::kMuonMinus) {
return o2::track::PID::Muon;
} else if (std::abs(pdgCode) == PDG_t::kPiPlus) {
return o2::track::PID::Pion;
} else if (std::abs(pdgCode) == PDG_t::kKPlus) {
return o2::track::PID::Kaon;
} else if (std::abs(pdgCode) == PDG_t::kProton) {
return o2::track::PID::Proton;
} else if (std::abs(pdgCode) == PDG_t::kLambda0) {
return o2::track::PID::Lambda;
} else if (std::abs(pdgCode) == PDG_t::kXiMinus) {
return o2::track::PID::XiMinus;
} else if (std::abs(pdgCode) == PDG_t::kOmegaMinus) {
return o2::track::PID::OmegaMinus;
} else {
return o2::track::PID::Pion; // Default trackParCov assumption
}
}

/// Function to decay the xi
/// \param particle the particle to decay
/// \param track track of particle to decay
Expand Down Expand Up @@ -878,9 +904,12 @@ struct OnTheFlyTracker {
getHist(TH1, histPath + "hXiBuilding")->Fill(0.0f);
}

o2::upgrade::convertTLorentzVectorToO2Track(kPiMinus, cascadeDecayProducts[0], xiDecayVertex, xiDaughterTrackParCovsPerfect[0], pdgDB);
o2::upgrade::convertTLorentzVectorToO2Track(kPiMinus, cascadeDecayProducts[1], laDecayVertex, xiDaughterTrackParCovsPerfect[1], pdgDB);
o2::upgrade::convertTLorentzVectorToO2Track(kProton, cascadeDecayProducts[2], laDecayVertex, xiDaughterTrackParCovsPerfect[2], pdgDB);
o2::upgrade::convertTLorentzVectorToO2Track(PDG_t::kPiMinus, cascadeDecayProducts[0], xiDecayVertex, xiDaughterTrackParCovsPerfect[0], pdgDB);
xiDaughterTrackParCovsPerfect[0].setPID(pdgCodeToPID(PDG_t::kPiMinus));
o2::upgrade::convertTLorentzVectorToO2Track(PDG_t::kPiMinus, cascadeDecayProducts[1], laDecayVertex, xiDaughterTrackParCovsPerfect[1], pdgDB);
xiDaughterTrackParCovsPerfect[1].setPID(pdgCodeToPID(PDG_t::kPiMinus));
o2::upgrade::convertTLorentzVectorToO2Track(PDG_t::kProton, cascadeDecayProducts[2], laDecayVertex, xiDaughterTrackParCovsPerfect[2], pdgDB);
xiDaughterTrackParCovsPerfect[2].setPID(pdgCodeToPID(PDG_t::kProton));

for (int i = 0; i < kCascProngs; i++) {
isReco[i] = false;
Expand Down Expand Up @@ -1001,7 +1030,7 @@ struct OnTheFlyTracker {
{posP[0] + negP[0], posP[1] + negP[1], posP[2] + negP[2]},
covV, 0, true);
v0Track.setAbsCharge(0);
v0Track.setPID(o2::track::PID::Lambda);
v0Track.setPID(pdgCodeToPID(PDG_t::kLambda0));

// dca fitter step
nCand = 0;
Expand Down Expand Up @@ -1040,8 +1069,8 @@ struct OnTheFlyTracker {

// initialize cascade track
o2::track::TrackParCov cascadeTrack = fitter.createParentTrackParCov();
cascadeTrack.setAbsCharge(-1); // may require more adjustments
cascadeTrack.setPID(o2::track::PID::XiMinus); // FIXME: not OK for omegas
cascadeTrack.setAbsCharge(-1); // may require more adjustments
cascadeTrack.setPID(pdgCodeToPID(PDG_t::kXiMinus)); // FIXME: not OK for omegas

thisCascade.cascradiusMC = xiDecayRadius2D;
thisCascade.pt = cascadeTrack.getPt();
Expand Down Expand Up @@ -1131,6 +1160,7 @@ struct OnTheFlyTracker {
o2::upgrade::convertMCParticleToO2Track(mcParticle, prefectCascadeTrack, pdgDB);

// back track is already smeared
prefectCascadeTrack.setPID(pdgCodeToPID(PDG_t::kXiMinus)); // FIXME: not OK for omegas
int nCascHits = fastTracker[icfg]->FastTrack(prefectCascadeTrack, trackedCasc, dNdEta);
reconstructedCascade = (fastTrackerSettings.minSiliconHitsForKinkReco < nCascHits) ? false : true;

Expand Down Expand Up @@ -1201,6 +1231,7 @@ struct OnTheFlyTracker {
std::array{pV0[0], pV0[1], pV0[2]}},
std::array{o2::constants::physics::MassPionCharged, o2::constants::physics::MassLambda});

newCascadeTrack.setPID(pdgCodeToPID(PDG_t::kXiMinus)); // FIXME: not OK for omegas
tracksAlice3.push_back(TrackAlice3{newCascadeTrack, mcParticle.globalIndex(), time, timeResolutionUs, false, false, 1, thisCascade.foundClusters});

// add this cascade to vector (will fill cursor later with collision ID)
Expand Down Expand Up @@ -1436,6 +1467,7 @@ struct OnTheFlyTracker {
} else if (fastPrimaryTrackerSettings.fastTrackPrimaries) {
o2::track::TrackParCov o2Track;
o2::upgrade::convertMCParticleToO2Track(mcParticle, o2Track, pdgDB);
o2Track.setPID(pdgCodeToPID(mcParticle.pdgCode()));
const int nHits = fastTracker[icfg]->FastTrack(o2Track, trackParCov, dNdEta);
if (nHits < fastPrimaryTrackerSettings.minSiliconHits) {
reconstructed = false;
Expand Down Expand Up @@ -1838,6 +1870,7 @@ struct OnTheFlyTracker {
} else if (enableSecondarySmearing) {
o2::track::TrackParCov perfectTrackParCov;
o2::upgrade::convertMCParticleToO2Track(mcParticle, perfectTrackParCov, pdgDB);
perfectTrackParCov.setPID(pdgCodeToPID(mcParticle.pdgCode()));
const int nHits = fastTracker[icfg]->FastTrack(perfectTrackParCov, trackParCov, dNdEta);
if (nHits < fastTrackerSettings.minSiliconHits) {
reconstructed = false;
Expand Down
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