[PWGEM/Dilepton] update skimmerPrimaryElectron.cxx for eID in low B (#11199)

Author: dsekihat

PWGEM/Dilepton/TableProducer/skimmerPrimaryElectron.cxx

@@ -92,7 +92,8 @@ struct skimmerPrimaryElectron {
   Configurable<float> maxTPCNsigmaPr{"maxTPCNsigmaPr", 2.5, "max. TPC n sigma for proton exclusion"};
   Configurable<float> minTPCNsigmaPr{"minTPCNsigmaPr", -2.5, "min. TPC n sigma for proton exclusion"};
   Configurable<bool> requireTOF{"requireTOF", false, "require TOF hit"};
-  Configurable<float> max_pin_for_pion_rejection{"max_pin_for_pion_rejection", 1e+10, "pion rejection is applied below this pin"};
+  Configurable<float> min_pin_for_pion_rejection{"min_pin_for_pion_rejection", 0.0, "pion rejection is applied above this pin"}; // this is used only in TOFreq
+  Configurable<float> max_pin_for_pion_rejection{"max_pin_for_pion_rejection", 0.5, "pion rejection is applied below this pin"};
   Configurable<float> max_frac_shared_clusters_tpc{"max_frac_shared_clusters_tpc", 999.f, "max fraction of shared clusters in TPC"};
 
   HistogramRegistry fRegistry{"output", {}, OutputObjHandlingPolicy::AnalysisObject, false, false};
@@ -328,7 +329,7 @@ struct skimmerPrimaryElectron {
   template <typename TTrack>
   bool isElectron_TOFreq(TTrack const& track)
   {
-    if (minTPCNsigmaPi < track.tpcNSigmaPi() && track.tpcNSigmaPi() < maxTPCNsigmaPi && track.tpcInnerParam() < max_pin_for_pion_rejection) {
+    if (minTPCNsigmaPi < track.tpcNSigmaPi() && track.tpcNSigmaPi() < maxTPCNsigmaPi && (min_pin_for_pion_rejection < track.tpcInnerParam() && track.tpcInnerParam() < max_pin_for_pion_rejection)) {
       return false;
     }
     return minTPCNsigmaEl < track.tpcNSigmaEl() && track.tpcNSigmaEl() < maxTPCNsigmaEl && std::fabs(track.tofNSigmaEl()) < maxTOFNsigmaEl;