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[ALICE3] Strangeness tracking considers dead phi region #13275

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Merged
njacazio merged 1 commit into from
Oct 8, 2025
Merged

[ALICE3] Strangeness tracking considers dead phi region #13275

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4 changes: 4 additions & 0 deletions ALICE3/TableProducer/OTF/onTheFlyTracker.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -447,13 +447,13 @@
double pi_mass = o2::constants::physics::MassPionCharged;
double pr_mass = o2::constants::physics::MassProton;

double xi_gamma = 1 / sqrt(1 + (particle.p() * particle.p()) / (xi_mass * xi_mass));

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[std-prefix] 

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double xi_ctau = 4.91 * xi_gamma;
double xi_rxyz = (-xi_ctau * log(1 - u));

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[std-prefix] 

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float sna, csa;
o2::math_utils::CircleXYf_t xi_circle;
track.getCircleParams(magneticField, xi_circle, sna, csa);
double xi_rxy = xi_rxyz / sqrt(1. + track.getTgl() * track.getTgl());

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[std-prefix] 

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double theta = xi_rxy / xi_circle.rC;
double newX = ((particle.vx() - xi_circle.xC) * std::cos(theta) - (particle.vy() - xi_circle.yC) * std::sin(theta)) + xi_circle.xC;
double newY = ((particle.vy() - xi_circle.yC) * std::cos(theta) + (particle.vx() - xi_circle.xC) * std::sin(theta)) + xi_circle.yC;
Expand All @@ -471,10 +471,10 @@
decayDaughters.push_back(*xiDecay.GetDecay(1));
TLorentzVector la = *xiDecay.GetDecay(0);

double la_gamma = 1 / sqrt(1 + (la.P() * la.P()) / (la_mass * la_mass));

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[std-prefix] 

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double la_ctau = 7.89 * la_gamma;
std::vector<double> laDaughters = {pi_mass, pr_mass};
double la_rxyz = (-la_ctau * log(1 - u));

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[std-prefix] 

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laDecayVertex.push_back(xiDecayVertex[0] + la_rxyz * (xiDecay.GetDecay(0)->Px() / xiDecay.GetDecay(0)->P()));
laDecayVertex.push_back(xiDecayVertex[1] + la_rxyz * (xiDecay.GetDecay(0)->Py() / xiDecay.GetDecay(0)->P()));
laDecayVertex.push_back(xiDecayVertex[2] + la_rxyz * (xiDecay.GetDecay(0)->Pz() / xiDecay.GetDecay(0)->P()));
Expand Down Expand Up @@ -558,8 +558,8 @@
o2::track::TrackParCov xiTrackParCov;
o2::upgrade::convertMCParticleToO2Track(mcParticle, xiTrackParCov, pdgDB);
decayParticle(mcParticle, xiTrackParCov, decayProducts, xiDecayVertex, laDecayVertex);
xiDecayRadius2D = sqrt(xiDecayVertex[0] * xiDecayVertex[0] + xiDecayVertex[1] * xiDecayVertex[1]);

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laDecayRadius2D = sqrt(laDecayVertex[0] * laDecayVertex[0] + laDecayVertex[1] * laDecayVertex[1]);

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}
}

Expand All @@ -584,7 +584,7 @@
}

histos.fill(HIST("hPtGenerated"), mcParticle.pt());
if (TMath::Abs(mcParticle.pdgCode()) == 11)

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[root/entity] 

Replace ROOT entities with equivalents from standard C++ or from O2.
histos.fill(HIST("hPtGeneratedEl"), mcParticle.pt());
if (TMath::Abs(mcParticle.pdgCode()) == 211)
histos.fill(HIST("hPtGeneratedPi"), mcParticle.pt());
Expand Down Expand Up @@ -734,7 +734,7 @@
// DCA to PV taken care of in daughter tracks already, not necessary
thisCascade.dcaV0dau = TMath::Sqrt(fitter.getChi2AtPCACandidate());
thisCascade.v0radius = std::hypot(pos[0], pos[1]);
thisCascade.mLambda = RecoDecay::m(array{array{posP[0], posP[1], posP[2]}, array{negP[0], negP[1], negP[2]}}, array{o2::constants::physics::MassProton, o2::constants::physics::MassPionCharged});

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// go for cascade: create V0 (pseudo)track from reconstructed V0
std::array<float, 21> covV = {0.};
Expand Down Expand Up @@ -779,7 +779,7 @@
thisCascade.cascradius = std::hypot(posCascade[0], posCascade[1]);
bachelorTrackAtPCA.getPxPyPzGlo(bachP);

thisCascade.mXi = RecoDecay::m(array{array{bachP[0], bachP[1], bachP[2]}, array{posP[0] + negP[0], posP[1] + negP[1], posP[2] + negP[2]}}, array{o2::constants::physics::MassPionCharged, o2::constants::physics::MassLambda});

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// initialize cascade track
o2::track::TrackParCov cascadeTrack = fitter.createParentTrackParCov();
Expand Down Expand Up @@ -838,6 +838,10 @@
static_cast<float>(xyz1[1]),
static_cast<float>(xyz1[2])};
const o2::track::TrackParametrization<float>::dim3_t hitpointcov = {currentTrackingLayer.getResolutionRPhi() * currentTrackingLayer.getResolutionRPhi(), 0.f, currentTrackingLayer.getResolutionZ() * currentTrackingLayer.getResolutionZ()};
if (currentTrackingLayer.isInDeadPhiRegion(phi)) {
continue; // No hit for strangeness tracking update
}

cascadeTrack.update(hitpoint, hitpointcov);
thisCascade.foundClusters++; // add to findable
}
Expand Down
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