Added switch for PID exclusion criteria

Author: Preet Pati

PWGCF/TwoParticleCorrelations/Tasks/pidDiHadron.cxx

@@ -119,6 +119,7 @@ struct PidDiHadron {
   O2_DEFINE_CONFIGURABLE(cfgPIDParticle, int, 0, "1 = pion, 2 = kaon, 3 = proton, 4 = kshort, 5 = lambda, 6 = phi, 0 for no PID")
   O2_DEFINE_CONFIGURABLE(cfgGetNsigmaQA, bool, true, "Get QA histograms for selection of pions, kaons, and protons")
   O2_DEFINE_CONFIGURABLE(cfgUseAntiLambda, bool, true, "Use AntiLambda candidates for analysis")
+  O2_DEFINE_CONFIGURABLE(cfgPIDUseRejection, bool, true, "Turn off and on the exclusion criteria for PID determination")
 
   struct : ConfigurableGroup {
     O2_DEFINE_CONFIGURABLE(cfgMultCentHighCutFunction, std::string, "[0] + [1]*x + [2]*x*x + [3]*x*x*x + [4]*x*x*x*x + 10.*([5] + [6]*x + [7]*x*x + [8]*x*x*x + [9]*x*x*x*x)", "Functional for multiplicity correlation cut");
@@ -183,7 +184,7 @@ struct PidDiHadron {
 
   // make the filters and cuts.
   Filter collisionFilter = (nabs(aod::collision::posZ) < cfgCutVertex);
-  Filter trackFilter = (nabs(aod::track::eta) < cfgCutEta) && (aod::track::pt > cfgCutPtPOIMin) && (aod::track::pt < cfgCutPtPOIMax) && ((requireGlobalTrackInFilter()) || (aod::track::isGlobalTrackSDD == (uint8_t) true)) && (aod::track::tpcChi2NCl < cfgCutChi2prTPCcls) && (nabs(aod::track::dcaZ) < cfgCutDCAz);
+  Filter trackFilter = (nabs(aod::track::eta) < cfgCutEta) && (aod::track::pt > cfgCutPtPOIMin) && (aod::track::pt < cfgCutPtPOIMax) && ((requireGlobalTrackInFilter()) || (aod::track::isGlobalTrackSDD == (uint8_t)true)) && (aod::track::tpcChi2NCl < cfgCutChi2prTPCcls) && (nabs(aod::track::dcaZ) < cfgCutDCAz);
 
   using FilteredCollisions = soa::Filtered<soa::Join<aod::Collisions, aod::EvSel, aod::CentFT0Cs, aod::CentFT0CVariant1s, aod::CentFT0Ms, aod::CentFV0As, aod::Mults>>;
   using FilteredTracks = soa::Filtered<soa::Join<aod::Tracks, aod::TrackSelection, aod::TracksExtra, aod::TracksDCA, aod::pidTPCFullPi, aod::pidTPCFullKa, aod::pidTPCFullPr, aod::pidTOFbeta, aod::pidTOFFullPi, aod::pidTOFFullKa, aod::pidTOFFullPr>>;
@@ -671,7 +672,7 @@ struct PidDiHadron {
       isProton = isDetectedProton;
     }
 
-    if ((isPion && isKaon) || (isPion && isProton) || (isKaon && isProton)) {
+    if (cfgPIDUseRejection && ((isPion && isKaon) || (isPion && isProton) || (isKaon && isProton))) {
       return -1; // more than one particle satisfy the criteria
     }