[PWGEM/Dilepton] update smearing task (AliceO2Group#9187)

Author: dsekihat

PWGEM/Dilepton/Tasks/createResolutionMap.cxx

@@ -110,7 +110,7 @@ struct CreateResolutionMap {
     std::string prefix = "muoncut_group";
     Configurable<uint> cfg_track_type{"cfg_track_type", 3, "muon track type [0: MFT-MCH-MID, 3: MCH-MID]"};
     Configurable<float> cfg_min_pt_track{"cfg_min_pt_track", 0.01, "min pT for single track"};
-    Configurable<float> cfg_min_eta_track{"cfg_min_eta_track", -5.0, "min eta for single track"};
+    Configurable<float> cfg_min_eta_track{"cfg_min_eta_track", -5.5, "min eta for single track"};
     Configurable<float> cfg_max_eta_track{"cfg_max_eta_track", -1.5, "max eta for single track"};
     Configurable<int> cfg_min_ncluster_mft{"cfg_min_ncluster_mft", 5, "min ncluster MFT"};
     Configurable<int> cfg_min_ncluster_mch{"cfg_min_ncluster_mch", 5, "min ncluster MCH"};

PWGEM/Dilepton/Utils/MomentumSmearer.h

@@ -169,6 +169,7 @@ class MomentumSmearer
               hs_reso->GetAxis(4)->SetRange(ich + 1, ich + 1);
               auto h3 = reinterpret_cast<TH3D*>(hs_reso->Projection(5, 6, 7));
               h3->SetName(Form("h3reso_cen%d_pt%d_eta%d_phi%d_ch%d", icen, ipt, ieta, iphi, ich));
+              h3->Scale(1.f, "width"); // convert ntrack to probability density
               fVecResoND[icen][ipt][ieta][iphi][ich] = h3;
             } // end of charge loop
           } // end of phi loop