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[ALICE3] fix fasttracker initialization in otf-tracker #17851

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Merged
jesgum merged 1 commit into from
Sep 9, 2026
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[ALICE3] fix fasttracker initialization in otf-tracker #17851

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4 changes: 3 additions & 1 deletion ALICE3/TableProducer/OTF/onTheFlyTracker.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,7 @@
#include <TGeoGlobalMagField.h>
#include <TH1.h>
#include <TH2.h>
#include <TLorentzVector.h>

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
#include <TMCProcess.h>
#include <TMath.h>
#include <TPDGCode.h>
Expand Down Expand Up @@ -531,7 +531,9 @@
getHist<TH1>(histPath + "hVtxTrials")->GetXaxis()->SetBinLabel(2, "Succeeded");
}

if (enableSecondarySmearing) {
if (enableSecondarySmearing ||
fastPrimaryTrackerSettings.fastTrackPrimaries ||
fastPrimaryTrackerSettings.fastTrackShortLivedParticles) {
fastTracker.emplace_back(std::make_unique<o2::fastsim::FastTracker>());
fastTracker[icfg]->SetMagneticField(mMagneticField);
fastTracker[icfg]->SetApplyZacceptance(fastTrackerSettings.applyZacceptance);
Expand Down Expand Up @@ -812,7 +814,7 @@
/// \param xiDecayVertex the address of the xi decay vertex
/// \param laDecayVertex the address of the la decay vertex
template <typename McParticleType>
void decayCascade(const McParticleType& particle, o2::track::TrackParCov track, std::vector<TLorentzVector>& decayDaughters, std::vector<double>& xiDecayVertex, std::vector<double>& laDecayVertex)

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
{
const double uXi = rand.Uniform(0, 1);
const double ctauXi = 4.91; // cm
Expand All @@ -835,12 +837,12 @@
xiDecayVertex.push_back(particle.vz() + rxyzXi * (particle.pz() / particle.p()));

std::vector<double> xiDaughters = {o2::constants::physics::MassLambda, o2::constants::physics::MassPionCharged};
TLorentzVector xi(newPx, newPy, particle.pz(), newE);

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
TGenPhaseSpace xiDecay;
xiDecay.SetDecay(xi, 2, xiDaughters.data());
xiDecay.Generate();
decayDaughters.push_back(*xiDecay.GetDecay(1));
TLorentzVector la = *xiDecay.GetDecay(0);

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.

const double uLa = rand.Uniform(0, 1);
const double ctauLa = 7.845; // cm
Expand All @@ -863,7 +865,7 @@
/// \param decayDaughters the address of resulting daughters
/// \param v0DecayVertex the address of the la decay vertex
template <typename McParticleType>
void decayV0Particle(const McParticleType& particle, std::vector<TLorentzVector>& decayDaughters, std::vector<double>& v0DecayVertex, int pdgCode)

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
{
double u = rand.Uniform(0, 1);
double v0Mass = -1.;
Expand Down Expand Up @@ -897,7 +899,7 @@

const double v0BetaGamma = particle.p() / v0Mass;
const double v0rxyz = (-v0BetaGamma * ctau * std::log(1 - u));
TLorentzVector v0(particle.px(), particle.py(), particle.pz(), particle.e());

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.

v0DecayVertex.push_back(particle.vx() + v0rxyz * (particle.px() / particle.p()));
v0DecayVertex.push_back(particle.vy() + v0rxyz * (particle.py() / particle.p()));
Expand Down Expand Up @@ -972,7 +974,7 @@
o2::upgrade::convertMCParticleToO2Track(mcParticle, trackParCov, pdgDB);
const std::string histPath = "Configuration_" + std::to_string(icfg) + "/";

std::vector<TLorentzVector> cascadeDecayProducts;

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
std::vector<double> xiDecayVertex, laDecayVertex;
static constexpr int kCascProngs = 3;
std::array<o2::track::TrackParCov, kCascProngs> xiDaughterTrackParCovsPerfect;
Expand Down Expand Up @@ -1002,11 +1004,11 @@
getHist<TH1>(histPath + "hXiBuilding")->Fill(0.0f);
}

o2::upgrade::convertTLorentzVectorToO2Track(PDG_t::kPiMinus, cascadeDecayProducts[0], xiDecayVertex, xiDaughterTrackParCovsPerfect[0], pdgDB);

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
xiDaughterTrackParCovsPerfect[0].setPID(pdgCodeToPID(PDG_t::kPiMinus));
o2::upgrade::convertTLorentzVectorToO2Track(PDG_t::kPiMinus, cascadeDecayProducts[1], laDecayVertex, xiDaughterTrackParCovsPerfect[1], pdgDB);

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
xiDaughterTrackParCovsPerfect[1].setPID(pdgCodeToPID(PDG_t::kPiMinus));
o2::upgrade::convertTLorentzVectorToO2Track(PDG_t::kProton, cascadeDecayProducts[2], laDecayVertex, xiDaughterTrackParCovsPerfect[2], pdgDB);

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[root/lorentz-vector] 

Do not use the TLorentzVector legacy class. Use std::array with RecoDecay methods or the ROOT::Math::LorentzVector template instead.
xiDaughterTrackParCovsPerfect[2].setPID(pdgCodeToPID(PDG_t::kProton));
o2::track::TrackParCov perfectCascadeTrack;
o2::upgrade::convertMCParticleToO2Track(mcParticle, perfectCascadeTrack, pdgDB);
Expand Down
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