PWGEM/PhotonMeson: improve event mixing (#4408)

Author: dsekihat

PWGEM/PhotonMeson/TableProducer/skimmerDalitzEE.cxx

@@ -57,6 +57,8 @@ struct skimmerDalitzEE {
     "fRegistry",
     {
       {"hNpairs", "hNpairs;pair type;Number of Pairs", {HistType::kTH1F, {{3, -1.5f, +1.5f}}}},
+      {"hNele", "hNele;centrality FT0C;Number of electrons", {HistType::kTH2F, {{110, 0, 110}, {101, -0.5f, +100.5f}}}},
+      {"hNpos", "hNpos;centrality FT0C;Number of positrons", {HistType::kTH2F, {{110, 0, 110}, {101, -0.5f, +100.5f}}}},
     },
   };
 
@@ -133,6 +135,9 @@ struct skimmerDalitzEE {
     for (auto& collision : collisions) {
       auto posTracks_per_coll = posTracks->sliceByCached(o2::aod::emprimaryelectron::emreducedeventId, collision.globalIndex(), cache);
       auto negTracks_per_coll = negTracks->sliceByCached(o2::aod::emprimaryelectron::emreducedeventId, collision.globalIndex(), cache);
+      fRegistry.fill(HIST("hNpos"), collision.centFT0C(), posTracks_per_coll.size());
+      fRegistry.fill(HIST("hNele"), collision.centFT0C(), negTracks_per_coll.size());
+      // LOGF(info, "collision.centFT0C() = %f, posTracks_per_coll.size() = %d, negTracks_per_coll.size() = %d", collision.centFT0C() , posTracks_per_coll.size(), negTracks_per_coll.size());
 
       int npair_uls = 0, npair_lspp = 0, npair_lsmm = 0;
       npair_uls = fillPairTable<EM_EEPairType::kULS, false>(collision, posTracks_per_coll, negTracks_per_coll); // ULS

PWGEM/PhotonMeson/Tasks/TaggingPi0.cxx

@@ -44,7 +44,7 @@ using namespace o2::aod::photonpair;
 using MyCollisions = soa::Join<aod::EMReducedEvents, aod::EMReducedEventsMult, aod::EMReducedEventsCent, aod::EMReducedEventsNgPCM, aod::EMReducedEventsNgPHOS, aod::EMReducedEventsNgEMC>;
 using MyCollision = MyCollisions::iterator;
 
-using MyV0Photons = soa::Join<aod::V0PhotonsKF, aod::V0Recalculation, aod::V0KFEMReducedEventIds>;
+using MyV0Photons = soa::Join<aod::V0PhotonsKF, aod::V0KFEMReducedEventIds>;
 using MyV0Photon = MyV0Photons::iterator;
 
 using MyDalitzEEs = soa::Join<aod::DalitzEEs, aod::DalitzEEEMReducedEventIds>;

PWGEM/PhotonMeson/Tasks/TaggingPi0MC.cxx

@@ -47,7 +47,7 @@ using namespace o2::aod::photonpair;
 using MyCollisions = soa::Join<aod::EMReducedEvents, aod::EMReducedEventsMult, aod::EMReducedEventsCent, aod::EMReducedMCEventLabels>;
 using MyCollision = MyCollisions::iterator;
 
-using MyV0Photons = soa::Join<aod::V0PhotonsKF, aod::V0Recalculation, aod::V0KFEMReducedEventIds>;
+using MyV0Photons = soa::Join<aod::V0PhotonsKF, aod::V0KFEMReducedEventIds>;
 using MyV0Photon = MyV0Photons::iterator;
 
 using MyDalitzEEs = soa::Join<aod::DalitzEEs, aod::DalitzEEEMReducedEventIds>;