[DPG] Redefine the Histogram for the mother (AliceO2Group#8992)

Author: upasanasharma31

DPG/Tasks/AOTTrack/qaEfficiency.cxx

@@ -76,9 +76,6 @@ static constexpr const char* particleTitle[nParticles] = {"e", "#mu", "#pi", "K"
 static constexpr int PDGs[nParticles] = {11, 13, 211, 321, 2212, 1000010020, 1000010030, 1000020030, 1000020040,
                                          -11, -13, -211, -321, -2212, -1000010020, -1000010030, -1000020030, -1000020040};
 
-// Histograms
-std::shared_ptr<TH1> hPtmotherGenerated; // histogram to store pT of Xi and Lambda
-
 // Pt
 std::array<std::shared_ptr<TH1>, nParticles> hPtIts;
 std::array<std::shared_ptr<TH1>, nParticles> hPtTpc;
@@ -106,6 +103,7 @@ std::array<std::shared_ptr<TH1>, nParticles> hPtItsTpcStr;
 std::array<std::shared_ptr<TH1>, nParticles> hPtTrkItsTpcStr;
 std::array<std::shared_ptr<TH1>, nParticles> hPtItsTpcTofStr;
 std::array<std::shared_ptr<TH1>, nParticles> hPtGeneratedStr;
+std::array<std::shared_ptr<TH1>, nParticles> hPtmotherGenerated; // histogram to store pT of mother
 std::array<std::shared_ptr<TH1>, nParticles> hdecaylengthmother; // histogram to store decaylength of mother
 
 // Pt for secondaries from material
@@ -366,6 +364,7 @@ struct QaEfficiency {
     hPtTrkItsTpcStr[histogramIndex] = histos.add<TH1>(Form("MC/pdg%i/pt/str/trk/its_tpc", PDGs[histogramIndex]), "ITS-TPC tracks (reco from weak decays) " + tagPt, kTH1D, {axisPt});
     hPtItsTpcTofStr[histogramIndex] = histos.add<TH1>(Form("MC/pdg%i/pt/str/its_tpc_tof", PDGs[histogramIndex]), "ITS-TPC-TOF tracks (from weak decays) " + tagPt, kTH1D, {axisPt});
     hPtGeneratedStr[histogramIndex] = histos.add<TH1>(Form("MC/pdg%i/pt/str/generated", PDGs[histogramIndex]), "Generated (from weak decays) " + tagPt, kTH1D, {axisPt});
+    hPtmotherGenerated[histogramIndex] = histos.add<TH1>(Form("MC/pdg%i/pt/str/generated_mother", PDGs[histogramIndex]), "Generated Mother " + tagPt, kTH1D, {axisPt});
     hdecaylengthmother[histogramIndex] = histos.add<TH1>(Form("MC/pdg%i/pt/str/decayLength", PDGs[histogramIndex]), "Decay Length of mother particle" + tagPt, kTH1D, {axisPt});
 
     // Ter
@@ -663,9 +662,6 @@ struct QaEfficiency {
       histos.add("MC/occ_cent/reco/neg/its", "ITS Negative ", kTH3D, {axisOcc, axisCent, axisPt});
     }
 
-    AxisSpec axisPtMother{ptBins, "#it{p}_{T} (GeV/#it{c})"};
-    hPtmotherGenerated = histos.add<TH1>("MC/mother/pt/generated", "Generated pT of mother Lambda or Xi", kTH1D, {axisPtMother});
-
     static_for<0, 1>([&](auto pdgSign) {
       makeMCHistograms<pdgSign, o2::track::PID::Electron>(doEl);
       makeMCHistograms<pdgSign, o2::track::PID::Muon>(doMu);
@@ -1267,7 +1263,7 @@ struct QaEfficiency {
                 break;
               }
               if (motherIsAccepted) {
-                hPtmotherGenerated->Fill(mother.pt()); // Fill generated pT for Lambda
+                hPtmotherGenerated[histogramIndex]->Fill(mother.pt()); // Fill generated pT for mother
               }
             }
           }