diff --git a/PWGEM/PhotonMeson/Core/HistogramsLibrary.cxx b/PWGEM/PhotonMeson/Core/HistogramsLibrary.cxx
index 42367303130..db43abf59ed 100644
--- a/PWGEM/PhotonMeson/Core/HistogramsLibrary.cxx
+++ b/PWGEM/PhotonMeson/Core/HistogramsLibrary.cxx
@@ -63,7 +63,7 @@ void o2::aod::emphotonhistograms::DefineHistograms(THashList* list, const char*
     list->Add(new TH1F("hNclsITS", "number of ITS clusters", 8, -0.5, 7.5));
     list->Add(new TH1F("hChi2ITS", "chi2/number of ITS clusters", 100, 0, 10));
     list->Add(new TH1F("hITSClusterMap", "ITS cluster map", 128, -0.5, 127.5));
-    list->Add(new TH1F("hMeanClusterSizeITS", "mean cluster size ITS;<cluster size> on ITS", 34, -0.5, 16.5));
+    list->Add(new TH1F("hMeanClusterSizeITS", "mean cluster size ITS;<cluster size> on ITS #times cos(#lambda)", 160, 0, 16));
     list->Add(new TH2F("hXY", "X vs. Y;X (cm);Y (cm)", 100, 0, 100, 100, -50, 50));
     list->Add(new TH2F("hZX", "Z vs. X;Z (cm);X (cm)", 200, -100, 100, 100, 0, 100));
     list->Add(new TH2F("hZY", "Z vs. Y;Z (cm);Y (cm)", 200, -100, 100, 100, -50, 50));
@@ -229,7 +229,7 @@ void o2::aod::emphotonhistograms::DefineHistograms(THashList* list, const char*
         list->Add(hs_dilepton_lsmm_dca_mix);
       }
 
-      if (TString(subGroup) == "mc") {
+      if (TString(subGroup).Contains("mc")) {
         // create phiv template
         list->Add(new TH2F("hMvsPhiV_Pi0", "m_{ee} vs. #varphi_{V};#varphi_{V} (rad.);m_{ee} (GeV/c^{2})", 32, 0, 3.2, 100, 0.0f, 0.1f));    // ee from pi0 dalitz decay
         list->Add(new TH2F("hMvsPhiV_Eta", "m_{ee} vs. #varphi_{V};#varphi_{V} (rad.);m_{ee} (GeV/c^{2})", 32, 0, 3.2, 100, 0.0f, 0.1f));    // ee from eta dalitz decay
@@ -257,7 +257,7 @@ void o2::aod::emphotonhistograms::DefineHistograms(THashList* list, const char*
       hs_dilepton_lsmm_same->Sumw2();
       list->Add(hs_dilepton_lsmm_same);
 
-      if (TString(subGroup) == "mix") {
+      if (TString(subGroup).Contains("mix")) {
         THnSparseF* hs_dilepton_uls_mix = reinterpret_cast<THnSparseF*>(hs_dilepton_uls_same->Clone("hs_dilepton_uls_mix"));
         THnSparseF* hs_dilepton_lspp_mix = reinterpret_cast<THnSparseF*>(hs_dilepton_lspp_same->Clone("hs_dilepton_lspp_mix"));
         THnSparseF* hs_dilepton_lsmm_mix = reinterpret_cast<THnSparseF*>(hs_dilepton_lsmm_same->Clone("hs_dilepton_lsmm_mix"));
@@ -307,7 +307,7 @@ void o2::aod::emphotonhistograms::DefineHistograms(THashList* list, const char*
     list->Add(new TH1F("hNclsITS", "number of ITS clusters", 8, -0.5, 7.5));
     list->Add(new TH1F("hChi2ITS", "chi2/number of ITS clusters", 100, 0, 10));
     list->Add(new TH1F("hITSClusterMap", "ITS cluster map", 128, -0.5, 127.5));
-    list->Add(new TH1F("hMeanClusterSizeITS", "mean cluster size ITS;<cluster size> on ITS", 34, -0.5, 16.5));
+    list->Add(new TH1F("hMeanClusterSizeITS", "mean cluster size ITS;<cluster size> on ITS #times cos(#lambda)", 160, 0, 16));
     if (TString(subGroup).Contains("mc")) {
       list->Add(new TH2F("hPtGen_DeltaPtOverPtGen", "electron p_{T} resolution;p_{T}^{gen} (GeV/c);(p_{T}^{rec} - p_{T}^{gen})/p_{T}^{gen}", 1000, 0, maxP, 400, -1.0f, 1.0f));
       list->Add(new TH2F("hPtGen_DeltaEta", "electron #eta resolution;p_{T}^{gen} (GeV/c);#eta^{rec} - #eta^{gen}", 1000, 0, maxP, 400, -1.0f, 1.0f));
diff --git a/PWGEM/PhotonMeson/Core/HistogramsLibrary.h b/PWGEM/PhotonMeson/Core/HistogramsLibrary.h
index 3de3f8e24a3..7621e103409 100644
--- a/PWGEM/PhotonMeson/Core/HistogramsLibrary.h
+++ b/PWGEM/PhotonMeson/Core/HistogramsLibrary.h
@@ -98,7 +98,7 @@ void FillHistClass(THashList* list, const char* subGroup, T const& obj)
     reinterpret_cast<TH1F*>(list->FindObject("hChi2TPC"))->Fill(obj.tpcChi2NCl());
     reinterpret_cast<TH1F*>(list->FindObject("hChi2ITS"))->Fill(obj.itsChi2NCl());
     reinterpret_cast<TH1F*>(list->FindObject("hITSClusterMap"))->Fill(obj.itsClusterMap());
-    reinterpret_cast<TH1F*>(list->FindObject("hMeanClusterSizeITS"))->Fill(obj.meanClusterSizeITS());
+    reinterpret_cast<TH1F*>(list->FindObject("hMeanClusterSizeITS"))->Fill(obj.meanClusterSizeITS() * std::cos(std::atan(obj.tgl())));
     reinterpret_cast<TH2F*>(list->FindObject("hTPCdEdx"))->Fill(obj.tpcInnerParam(), obj.tpcSignal());
     reinterpret_cast<TH2F*>(list->FindObject("hTPCNsigmaEl"))->Fill(obj.tpcInnerParam(), obj.tpcNSigmaEl());
     reinterpret_cast<TH2F*>(list->FindObject("hTPCNsigmaPi"))->Fill(obj.tpcInnerParam(), obj.tpcNSigmaPi());
@@ -121,7 +121,7 @@ void FillHistClass(THashList* list, const char* subGroup, T const& obj)
     reinterpret_cast<TH1F*>(list->FindObject("hChi2TPC"))->Fill(obj.tpcChi2NCl());
     reinterpret_cast<TH1F*>(list->FindObject("hChi2ITS"))->Fill(obj.itsChi2NCl());
     reinterpret_cast<TH1F*>(list->FindObject("hITSClusterMap"))->Fill(obj.itsClusterMap());
-    reinterpret_cast<TH1F*>(list->FindObject("hMeanClusterSizeITS"))->Fill(obj.meanClusterSizeITS());
+    reinterpret_cast<TH1F*>(list->FindObject("hMeanClusterSizeITS"))->Fill(obj.meanClusterSizeITS() * std::cos(std::atan(obj.tgl())));
     reinterpret_cast<TH2F*>(list->FindObject("hTPCdEdx"))->Fill(obj.tpcInnerParam(), obj.tpcSignal());
     reinterpret_cast<TH2F*>(list->FindObject("hTPCNsigmaEl"))->Fill(obj.tpcInnerParam(), obj.tpcNSigmaEl());
     reinterpret_cast<TH2F*>(list->FindObject("hTPCNsigmaMu"))->Fill(obj.tpcInnerParam(), obj.tpcNSigmaMu());
diff --git a/PWGEM/PhotonMeson/DataModel/gammaTables.h b/PWGEM/PhotonMeson/DataModel/gammaTables.h
index b43275269c8..dc0b62252bb 100644
--- a/PWGEM/PhotonMeson/DataModel/gammaTables.h
+++ b/PWGEM/PhotonMeson/DataModel/gammaTables.h
@@ -419,7 +419,7 @@ DECLARE_SOA_TABLE(EMPrimaryElectrons, "AOD", "EMPRIMARYEL", //!
                   track::TPCChi2NCl, track::TPCInnerParam,
                   track::TPCSignal, pidtpc::TPCNSigmaEl, pidtpc::TPCNSigmaMu, pidtpc::TPCNSigmaPi, pidtpc::TPCNSigmaKa, pidtpc::TPCNSigmaPr,
                   pidtofbeta::Beta, pidtof::TOFNSigmaEl, pidtof::TOFNSigmaMu, pidtof::TOFNSigmaPi, pidtof::TOFNSigmaKa, pidtof::TOFNSigmaPr,
-                  track::ITSClusterSizes, track::ITSChi2NCl, track::DetectorMap, track::Signed1Pt, track::CYY, track::CZZ, track::CZY,
+                  track::ITSClusterSizes, track::ITSChi2NCl, track::DetectorMap, track::Tgl, track::Signed1Pt, track::CYY, track::CZZ, track::CZY,
 
                   // dynamic column
                   track::TPCNClsFound<track::TPCNClsFindable, track::TPCNClsFindableMinusFound>,
@@ -538,7 +538,7 @@ DECLARE_SOA_TABLE(EMPrimaryMuons, "AOD", "EMPRIMARYMU", //!
                   track::TPCChi2NCl, track::TPCInnerParam,
                   track::TPCSignal, pidtpc::TPCNSigmaEl, pidtpc::TPCNSigmaMu, pidtpc::TPCNSigmaPi, pidtpc::TPCNSigmaKa, pidtpc::TPCNSigmaPr,
                   pidtofbeta::Beta, pidtof::TOFNSigmaEl, pidtof::TOFNSigmaMu, pidtof::TOFNSigmaPi, pidtof::TOFNSigmaKa, pidtof::TOFNSigmaPr,
-                  track::ITSClusterSizes, track::ITSChi2NCl, track::DetectorMap, track::Signed1Pt, track::CYY, track::CZZ, track::CZY,
+                  track::ITSClusterSizes, track::ITSChi2NCl, track::DetectorMap, track::Tgl, track::Signed1Pt, track::CYY, track::CZZ, track::CZY,
 
                   // dynamic column
                   track::TPCNClsFound<track::TPCNClsFindable, track::TPCNClsFindableMinusFound>,
diff --git a/PWGEM/PhotonMeson/TableProducer/skimmerPrimaryElectron.cxx b/PWGEM/PhotonMeson/TableProducer/skimmerPrimaryElectron.cxx
index b9ab1ccc06c..7cdb41a2a80 100644
--- a/PWGEM/PhotonMeson/TableProducer/skimmerPrimaryElectron.cxx
+++ b/PWGEM/PhotonMeson/TableProducer/skimmerPrimaryElectron.cxx
@@ -283,7 +283,7 @@ struct skimmerPrimaryElectron {
                          track.tpcChi2NCl(), track.tpcInnerParam(),
                          track.tpcSignal(), track.tpcNSigmaEl(), track.tpcNSigmaMu(), track.tpcNSigmaPi(), track.tpcNSigmaKa(), track.tpcNSigmaPr(),
                          track.beta(), track.tofNSigmaEl(), track.tofNSigmaMu(), track.tofNSigmaPi(), track.tofNSigmaKa(), track.tofNSigmaPr(),
-                         track.itsClusterSizes(), track.itsChi2NCl(), track.detectorMap(), track.signed1Pt(), track.cYY(), track.cZZ(), track.cZY());
+                         track.itsClusterSizes(), track.itsChi2NCl(), track.detectorMap(), track.tgl(), track.signed1Pt(), track.cYY(), track.cZZ(), track.cZY());
       fRegistry.fill(HIST("Track/hTPCdEdx_Pin_after"), track.tpcInnerParam(), track.tpcSignal());
       fRegistry.fill(HIST("Track/hTOFbeta_Pin_after"), track.tpcInnerParam(), track.beta());
       fRegistry.fill(HIST("Track/hTPCNsigmaEl_after"), track.tpcInnerParam(), track.tpcNSigmaEl());
diff --git a/PWGEM/PhotonMeson/TableProducer/skimmerPrimaryMuon.cxx b/PWGEM/PhotonMeson/TableProducer/skimmerPrimaryMuon.cxx
index 750ca3a2a9c..6c200db8953 100644
--- a/PWGEM/PhotonMeson/TableProducer/skimmerPrimaryMuon.cxx
+++ b/PWGEM/PhotonMeson/TableProducer/skimmerPrimaryMuon.cxx
@@ -310,7 +310,7 @@ struct skimmerPrimaryMuon {
                      track.tpcChi2NCl(), track.tpcInnerParam(),
                      track.tpcSignal(), track.tpcNSigmaEl(), track.tpcNSigmaMu(), track.tpcNSigmaPi(), track.tpcNSigmaKa(), track.tpcNSigmaPr(),
                      track.beta(), track.tofNSigmaEl(), track.tofNSigmaMu(), track.tofNSigmaPi(), track.tofNSigmaKa(), track.tofNSigmaPr(),
-                     track.itsClusterSizes(), track.itsChi2NCl(), track.detectorMap(), track.signed1Pt(), track.cYY(), track.cZZ(), track.cZY());
+                     track.itsClusterSizes(), track.itsChi2NCl(), track.detectorMap(), track.tgl(), track.signed1Pt(), track.cYY(), track.cZZ(), track.cZY());
       fRegistry.fill(HIST("Track/hTPCdEdx_Pin_after"), track.tpcInnerParam(), track.tpcSignal());
       fRegistry.fill(HIST("Track/hTOFbeta_Pin_after"), track.tpcInnerParam(), track.beta());
       fRegistry.fill(HIST("Track/hTPCNsigmaMu_after"), track.tpcInnerParam(), track.tpcNSigmaMu());
diff --git a/PWGEM/PhotonMeson/Tasks/dalitzEEQCMC.cxx b/PWGEM/PhotonMeson/Tasks/dalitzEEQCMC.cxx
index d88aab36870..a52f64f9879 100644
--- a/PWGEM/PhotonMeson/Tasks/dalitzEEQCMC.cxx
+++ b/PWGEM/PhotonMeson/Tasks/dalitzEEQCMC.cxx
@@ -50,6 +50,8 @@ struct DalitzEEQCMC {
   Configurable<std::string> fConfigDalitzEECuts{"cfgDalitzEECuts", "mee_all_tpchadrejortofreq_lowB,nocut", "Comma separated list of dalitz ee cuts"};
   std::vector<DalitzEECut> fDalitzEECuts;
 
+  Configurable<bool> cfgDoDCAstudy{"cfgDoDCAstudy", false, "flag to fill histograms for DCA"};
+
   OutputObj<THashList> fOutputEvent{"Event"};
   OutputObj<THashList> fOutputTrack{"Track"};
   OutputObj<THashList> fOutputDalitzEE{"DalitzEE"};
@@ -93,7 +95,12 @@ struct DalitzEEQCMC {
     for (auto& cut : fDalitzEECuts) {
       std::string_view cutname = cut.GetName();
       THashList* list = reinterpret_cast<THashList*>(fMainList->FindObject("DalitzEE")->FindObject(cutname.data()));
-      o2::aod::emphotonhistograms::DefineHistograms(list, "DalitzEE", "mc");
+      // o2::aod::emphotonhistograms::DefineHistograms(list, "DalitzEE", "mc");
+      std::string histo_sub_group = "mc,";
+      if (cfgDoDCAstudy) {
+        histo_sub_group += "dca";
+      }
+      o2::aod::emphotonhistograms::DefineHistograms(list, "DalitzEE", histo_sub_group.data());
     }
   }
 
@@ -206,11 +213,14 @@ struct DalitzEEQCMC {
                 dca_ele_3d = std::sqrt(std::abs(chi2ele) / 2.);
                 dca_ee_3d = std::sqrt((dca_pos_3d * dca_pos_3d + dca_ele_3d * dca_ele_3d) / 2.);
               }
-              values_single[0] = uls_pair.mass();
-              values_single[1] = dca_pos_3d;
-              values_single[2] = dca_ele_3d;
-              values_single[3] = dca_ee_3d;
-              reinterpret_cast<THnSparseF*>(list_dalitzee_cut->FindObject("hs_dilepton_uls_dca_same"))->Fill(values_single);
+
+              if (cfgDoDCAstudy) {
+                values_single[0] = uls_pair.mass();
+                values_single[1] = dca_pos_3d;
+                values_single[2] = dca_ele_3d;
+                values_single[3] = dca_ee_3d;
+                reinterpret_cast<THnSparseF*>(list_dalitzee_cut->FindObject("hs_dilepton_uls_dca_same"))->Fill(values_single);
+              }
 
               values[0] = uls_pair.mass();
               values[1] = uls_pair.pt();