Fixes for ITS seeding vertexer (#15485)

* Fixes for ITS seeding vertexer

* Suppress Vtx debris only in PbPb 1st vertexing iteration

* suppress ITSVertexer settings in dpl-workflow which are anyway default.

Author: shahor02

Detectors/ITSMFT/ITS/tracking/include/ITStracking/TrackingConfigParam.h

@@ -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;
@@ -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;

Detectors/ITSMFT/ITS/tracking/src/Configuration.cxx

@@ -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 {

Detectors/ITSMFT/ITS/tracking/src/TrackingInterface.cxx

@@ -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();

prodtests/full-system-test/dpl-workflow.sh

@@ -164,7 +164,7 @@ EVE_OPT=" --jsons-folder $EDJSONS_DIR"
 
 # ITS vertexing settings
 if [[ $BEAMTYPE == "pp" || $LIGHTNUCLEI == "1" ]]; then
-  ITS_CONFIG_KEY+="ITSVertexerParam.phiCut=0.4;ITSVertexerParam.tanLambdaCut=0.17;ITSVertexerParam.pairCut=0.0317563;ITSVertexerParam.clusterCut=0.6640964;ITSVertexerParam.coarseZWindow=0.2049018;ITSVertexerParam.seedDedupZCut=0.0711793;ITSVertexerParam.refitDedupZCut=0.0680009;ITSVertexerParam.duplicateZCut=0.1582193;ITSVertexerParam.finalSelectionZCut=0.1081465;ITSVertexerParam.duplicateDistance2Cut=0.0117033;ITSVertexerParam.clusterContributorsCut=2;ITSVertexerParam.seedMemberRadiusZ=0;ITSVertexerParam.nSigmaCut=0.032841;ITSVertexerParam.suppressLowMultDebris=0;"
+  ITS_CONFIG_KEY+="ITSVertexerParam.phiCut=0.4;ITSVertexerParam.tanLambdaCut=0.17;ITSVertexerParam.clusterCut=0.664;ITSVertexerParam.coarseZWindow=0.2;ITSVertexerParam.seedDedupZCut=0.07;ITSVertexerParam.refitDedupZCut=0.068;ITSVertexerParam.duplicateZCut=0.158;ITSVertexerParam.finalSelectionZCut=0.108;ITSVertexerParam.duplicateDistance2Cut=0.0117;ITSVertexerParam.seedMemberRadiusZ=0;ITSVertexerParam.nSigmaCut=0.032841;ITSVertexerParam.suppressLowMultDebris=0;"
 fi
 
 if [[ $CTFINPUT != 1 ]]; then