[PWGEM] LMee: update dEta vs dPhi vs dpT (#8351)

Author: jjungIKF

PWGEM/Dilepton/Core/Dilepton.h

@@ -515,11 +515,11 @@ struct Dilepton {
 
     if (cfgAnalysisType == static_cast<int>(o2::aod::pwgem::dilepton::utils::pairutil::DileptonAnalysisType::kQC)) {
       fRegistry.add("Pair/same/uls/hs", "dilepton", kTHnSparseD, {axis_mass, axis_pt, axis_dca}, true);
-      fRegistry.add("Pair/same/uls/hsDeltaP", "difference of p between 2 tracks;#Deltap_{T} = |p_{T,1} - p_{T,2}| (GeV/c);#Delta#eta;#Delta#varphi (rad.);", kTHnSparseD, {{100, 0, 1}, {100, -0.5, +0.5}, {100, -0.5, 0.5}}, true);
+      fRegistry.add("Pair/same/uls/hsDeltaP", "difference of p between 2 tracks;|p_{T,1} - p_{T,2}|/|p_{T,1} + p_{T,2}|;#Delta#eta;#Delta#varphi (rad.);", kTHnSparseD, {{20, 0, 1}, {100, -0.5, +0.5}, {100, -0.5, 0.5}}, true);
 
       if constexpr (pairtype == o2::aod::pwgem::dilepton::utils::pairutil::DileptonPairType::kDielectron) {
         fRegistry.add("Pair/same/uls/hMvsPhiV", "m_{ee} vs. #varphi_{V};#varphi_{V} (rad.);m_{ee} (GeV/c^{2})", kTH2D, {{90, 0, M_PI}, {500, 0.0f, 0.5f}}, true); // phiv is only for dielectron
-        fRegistry.add("Pair/same/uls/hMvsOpAng", "m_{ee} vs. angle between 2 tracks;#omega (rad.);m_{ee} (GeV/c^{2})", kTH2D, {{200, 0, 4.0}, {100, 0.0f, 3.2}}, true);
+        fRegistry.add("Pair/same/uls/hMvsOpAng", "m_{ee} vs. angle between 2 tracks;#omega (rad.);m_{ee} (GeV/c^{2})", kTH2D, {{100, 0, 2.0}, {20, 0.0f, 3.2}}, true);
       }
       fRegistry.addClone("Pair/same/uls/", "Pair/same/lspp/");
       fRegistry.addClone("Pair/same/uls/", "Pair/same/lsmm/");
@@ -848,7 +848,7 @@ struct Dilepton {
     }
 
     if (cfgAnalysisType == static_cast<int>(o2::aod::pwgem::dilepton::utils::pairutil::DileptonAnalysisType::kQC)) {
-      float dpt = fabs(v1.Pt() - v2.Pt());
+      float dpt = fabs(v1.Pt() - v2.Pt()) / fabs(v1.Pt() + v2.Pt());
       float deta = t1.sign() * v1.Pt() > t2.sign() * v2.Pt() ? v1.Eta() - v2.Eta() : v2.Eta() - v1.Eta();
       float dphi = t1.sign() * v1.Pt() > t2.sign() * v2.Pt() ? v1.Phi() - v2.Phi() : v2.Phi() - v1.Phi();
       o2::math_utils::bringToPMPi(dphi);