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[Strangeness Tracker] Use meaningful matching chi2 calculation #14134

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Merged
shahor02 merged 1 commit into from
Apr 4, 2025
Merged

[Strangeness Tracker] Use meaningful matching chi2 calculation #14134

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1 change: 1 addition & 0 deletions Detectors/Vertexing/StrangenessTracking/include/StrangenessTracking/StrangenessTracker.h
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Original file line number Diff line number Diff line change
Expand Up @@ -321,6 +321,7 @@ class StrangenessTracker
protected:
bool mMCTruthON = false; /// flag availability of MC truth
int mNThreads = 1; /// number of threads (externally driven)
float mGlobalChi2 = -1; /// global topology matching chi2
gsl::span<const TrackITS> mInputITStracks; // input ITS tracks
std::vector<VBracket> mITSvtxBrackets; // time brackets for ITS tracks
std::vector<int> mTracksIdxTable; // index table for ITS tracks
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4 changes: 3 additions & 1 deletion Detectors/Vertexing/StrangenessTracking/src/StrangenessTracker.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -345,7 +345,6 @@ bool StrangenessTracker::matchDecayToITStrack(float decayR, StrangeTrack& strang
auto trackClusters = getTrackClusters(itsTrack);
auto trackClusSizes = getTrackClusterSizes(itsTrack);
auto& lastClus = trackClusters[0];
strangeTrack.mMatchChi2 = getMatchingChi2(strangeTrack.mMother, itsTrack);

auto radTol = decayR < 4 ? mStrParams->mRadiusTolIB : mStrParams->mRadiusTolOB;
auto nMinClusMother = trackClusters.size() < 4 ? 2 : mStrParams->mMinMotherClus;
Expand Down Expand Up @@ -413,11 +412,13 @@ bool StrangenessTracker::matchDecayToITStrack(float decayR, StrangeTrack& strang

std::reverse(motherClusters.begin(), motherClusters.end());

mGlobalChi2 = -1;
for (auto& clus : motherClusters) {
if (!updateTrack(clus, motherTrackClone)) {
break;
}
}
strangeTrack.mMatchChi2 = mGlobalChi2;

LOG(debug) << "Inward-outward refit finished, starting final topology refit";
// final Topology refit
Expand Down Expand Up @@ -517,6 +518,7 @@ bool StrangenessTracker::updateTrack(const ITSCluster& clus, o2::track::TrackPar
return false;
}

mGlobalChi2 += chi2;
return true;
}

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