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Fixes for ITS seeding vertexer #15485

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Fixes for ITS seeding vertexer #15485

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dd07112
Fixes for ITS seeding vertexer
shahor02 Jun 4, 2026
f192c20
Suppress Vtx debris only in PbPb 1st vertexing iteration
shahor02 Jun 5, 2026
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4 changes: 2 additions & 2 deletions Detectors/ITSMFT/ITS/tracking/include/ITStracking/TrackingConfigParam.h
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@ struct VertexerParamConfig : public o2::conf::ConfigurableParamHelper<VertexerPa
// geometrical cuts for tracklet selection for Pb-Pb
float zCut = 0.002f;
float phiCut = 0.005f;
float pairCut = 0.017321f;
float pairCut = 0.04f;
float clusterCut = 0.170048f;
float coarseZWindow = 0.055458f;
float seedDedupZCut = 0.116685f;
Expand All @@ -42,7 +42,7 @@ struct VertexerParamConfig : public o2::conf::ConfigurableParamHelper<VertexerPa
float maxZPositionAllowed = 25.f; // 4x sZ of the beam

// Artefacts selections
int clusterContributorsCut = 3; // minimum number of contributors for an accepted final vertex
int clusterContributorsCut = 2; // minimum number of contributors for an accepted final vertex
int suppressLowMultDebris = 16; // suppress all vertices below this threshold if a vertex was already found in a rof
int seedMemberRadiusTime = 0;
int seedMemberRadiusZ = 2;
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1 change: 1 addition & 0 deletions Detectors/ITSMFT/ITS/tracking/src/Configuration.cxx
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Expand Up @@ -310,6 +310,7 @@ std::vector<VertexingParameters> TrackingMode::getVertexingParameters(TrackingMo
vertParams[1].phiCut = 0.015f;
vertParams[1].tanLambdaCut = 0.015f;
vertParams[1].maxTrackletsPerCluster = 2000;
vertParams[1].suppressLowMultDebris = 0; // do not suppress low mult vertices in UPC mode
} else if (mode == TrackingMode::Sync || TrackingMode::Cosmics) {
vertParams.resize(1);
} else {
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1 change: 1 addition & 0 deletions Detectors/ITSMFT/ITS/tracking/src/TrackingInterface.cxx
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Expand Up @@ -346,6 +346,7 @@ void ITSTrackingInterface::run(framework::ProcessingContext& pc)
for (size_t iROF{0}; iROF < allTrackROFs.size(); ++iROF) {
allTrackROFs[iROF].setFirstEntry(rofEntries[iROF]);
allTrackROFs[iROF].setNEntries(rofEntries[iROF + 1] - rofEntries[iROF]);
allTrackROFs[iROF].setFlags(vertROFvec[iROF].getFlags());
if (mTimeFrame->getROFMaskView().isROFEnabled(clockLayerId, (int)iROF)) {
auto& irFrame = irFrames.emplace_back(allTrackROFs[iROF].getBCData(), allTrackROFs[iROF].getBCData() + clockLayer.mROFLength - 1);
irFrame.info = allTrackROFs[iROF].getNEntries();
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