Suppress Vtx debris only in PbPb 1st vertexing iteration

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;

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 {