add switch to count all or only negative tracks

Author: maciacco

PWGLF/TableProducer/Nuspex/ebyeMaker.cxx

@@ -201,6 +201,7 @@ struct EbyeMaker {
   Configurable<float> etaMaxV0dau{"etaMaxV0dau", 0.8f, "maximum eta V0 daughters"};
   Configurable<float> outerPIDMin{"outerPIDMin", -4.f, "minimum outer PID"};
 
+  Configurable<bool> countOnlyNeg{"countOnlyNeg", false, "count only negative charged particles in the event"};
   Configurable<bool> useAllEvSel{"useAllEvSel", false, "use additional event selections fo run 3 analyses"};
   Configurable<uint8_t> triggerCut{"triggerCut", 0x0, "trigger cut to select"};
   Configurable<bool> kINT7Intervals{"kINT7Intervals", false, "toggle kINT7 trigger selection in the 10-30% and 50-90% centrality intervals (2018 Pb-Pb)"};
@@ -571,7 +572,7 @@ struct EbyeMaker {
         continue;
       }
       histos.fill(HIST("QA/tpcSignal"), track.tpcInnerParam(), track.tpcSignal());
-      if (trackPt > ptMin[0] && trackPt < ptMax[0])
+      if (trackPt > ptMin[0] && trackPt < ptMax[0] && ((countOnlyNeg && track.sign() < 0) || !countOnlyNeg))
         nTracksColl++;
 
       for (int iP{0}; iP < kNpart; ++iP) {