[PWGEM/Dilepton] update skimmerPrimaryElectronQC.cxx (#12608)

Author: dsekihat

PWGEM/Dilepton/TableProducer/skimmerPrimaryElectronQC.cxx

@@ -95,6 +95,7 @@ struct skimmerPrimaryElectronQC {
 
   struct : ConfigurableGroup {
     std::string prefix = "tighttrackcut";
+    Configurable<int> min_ncluster_tpc_pid{"min_ncluster_tpc_pid", 60, "min ncluster tpc used for PID"};
     Configurable<int> min_ncluster_tpc{"min_ncluster_tpc", 0, "min ncluster tpc"};
     Configurable<int> mincrossedrows{"mincrossedrows", 100, "min. crossed rows"};
     Configurable<int> min_ncluster_its{"min_ncluster_its", 5, "min ncluster its"};
@@ -392,6 +393,10 @@ struct skimmerPrimaryElectronQC {
       return false;
     }
 
+    if (track.tpcNClsPID() < tighttrackcut.min_ncluster_tpc_pid) {
+      return false;
+    }
+
     mDcaInfoCov.set(999, 999, 999, 999, 999);
     auto trackParCov = getTrackParCov(track);
     trackParCov.setPID(o2::track::PID::Electron);