[PWGLF] added histos for reweighting (#13041)

Author: chiarapinto

PWGLF/Tasks/Nuspex/antinucleiInJets.cxx

@@ -338,6 +338,13 @@ struct AntinucleiInJets {
       registryMC.add("helium3_rec_tpc_ue", "helium3_rec_tpc_ue", HistType::kTH1F, {{nbins, 3 * min, 3 * max, "#it{p}_{T} (GeV/#it{c})"}});
       registryMC.add("antihelium3_rec_tpc_jet", "antihelium3_rec_tpc_jet", HistType::kTH1F, {{nbins, 3 * min, 3 * max, "#it{p}_{T} (GeV/#it{c})"}});
       registryMC.add("antihelium3_rec_tpc_ue", "antihelium3_rec_tpc_ue", HistType::kTH1F, {{nbins, 3 * min, 3 * max, "#it{p}_{T} (GeV/#it{c})"}});
+
+      // Generated spectra needed for reweighting
+      registryMC.add("protonBar", "protonBar", HistType::kTH1F, {{5000, 0, 5, "#it{p}_{T} (GeV/#it{c})"}});
+      registryMC.add("lambdaBar", "lambdaBar", HistType::kTH1F, {{5000, 0, 5, "#it{p}_{T} (GeV/#it{c})"}});
+      registryMC.add("xiBar", "xiBar", HistType::kTH1F, {{5000, 0, 5, "#it{p}_{T} (GeV/#it{c})"}});
+      registryMC.add("omegaBar", "omegaBar", HistType::kTH1F, {{5000, 0, 5, "#it{p}_{T} (GeV/#it{c})"}});
+      registryMC.add("sigmaBar", "sigmaBar", HistType::kTH1F, {{5000, 0, 5, "#it{p}_{T} (GeV/#it{c})"}});
     }
 
     // Systematic uncertainties (Data)
@@ -1261,6 +1268,7 @@ struct AntinucleiInJets {
           case PDG_t::kProtonBar:
             registryMC.fill(HIST("antip_gen_jet"), particle.pt());
             registryMC.fill(HIST("antip_gen_ue"), particle.pt());
+            registryMC.fill(HIST("protonBar"), particle.pt());
             break;
           case o2::constants::physics::Pdg::kDeuteron:
             registryMC.fill(HIST("deuteron_gen_jet"), particle.pt());
@@ -1278,6 +1286,19 @@ struct AntinucleiInJets {
             registryMC.fill(HIST("antihelium3_gen_jet"), particle.pt());
             registryMC.fill(HIST("antihelium3_gen_ue"), particle.pt());
             break;
+          // Histograms for re-weighting
+          case PDG_t::kLambda0Bar:
+            registryMC.fill(HIST("lambdaBar"), particle.pt());
+            break;
+          case PDG_t::kXiPlusBar:
+            registryMC.fill(HIST("xiBar"), particle.pt());
+            break;
+          case PDG_t::kOmegaPlusBar:
+            registryMC.fill(HIST("omegaBar"), particle.pt());
+            break;
+          case PDG_t::kSigmaBarMinus:
+            registryMC.fill(HIST("sigmaBar"), particle.pt());
+            break;
         }
       }