[PWGJE] HadronPhotonCorrelation Task: Small bug fixes (#13471)

Author: pestratm

PWGJE/Tasks/hadronPhotonCorrelation.cxx

@@ -120,12 +120,12 @@ struct HadronPhotonCorrelation {
 
   // Particle ids for storing neutral hadrons
   std::map<std::string, int> pidCodes = {
-    {"pi0", 1},   // pi0
-    {"eta", 2},   // eta
-    {"eta'", 3},  // eta'
-    {"phi", 4},   // phi
-    {"omega", 5}, // omega
-    //{"Sigma0", 6}, // Sigma
+    {"pi0", 1},    // pi0
+    {"eta", 2},    // eta
+    {"eta'", 3},   // eta'
+    {"phi", 4},    // phi
+    {"omega", 5},  // omega
+    {"Sigma0", 6}, // Sigma
     {"Sigma0_bar", 6}};
 
   std::map<int, int> pidToPdg = {
@@ -1018,6 +1018,9 @@ struct HadronPhotonCorrelation {
             if (!initTrigParticle(track_trig)) {
               continue;
             }
+            if (track_trig == track_assoc) {
+              continue;
+            }
             float dphi = RecoDecay::constrainAngle(daughter->Phi() - track_trig.phi(), -PIHalf);
             registry.fill(HIST("generated/charged/hCocktailPhotonCorrelGen"), track_trig.pt(), track_assoc.pt(), daughter->Pt(), daughter->Eta() - track_trig.eta(), dphi, pidCodes[pdgParticle->GetName()], collision.weight());
           }