[PWGHF] fix event mixing binning setup in D0-h correlator (#15595)

Author: swapneshkhade

PWGHF/HFC/TableProducer/correlatorD0Hadrons.cxx

@@ -254,7 +254,7 @@ struct HfCorrelatorD0Hadrons {
   Preslice<aod::McParticles> perTrueCollision = o2::aod::mcparticle::mcCollisionId;
 
   ConfigurableAxis zPoolBins{"zPoolBins", {VARIABLE_WIDTH, -10.0f, -2.5f, 2.5f, 10.0f}, "z vertex position pools"};
-  ConfigurableAxis multPoolBins{"multPoolBins", {VARIABLE_WIDTH, 0.0f, 2000.0f, 6000.0f, 10000.0f}, "event multiplicity pools (FT0M)"};
+  ConfigurableAxis multPoolBins{"multPoolBins", {VARIABLE_WIDTH, 0.0f, 1100.0f, 1900.0f, 10000.0f}, "event multiplicity pools (FT0M)"};
   ConfigurableAxis multPoolBinsMcGen{"multPoolBinsMcGen", {VARIABLE_WIDTH, 0.0f, 20.0f, 50.0f, 500.0f}, "Mixing bins - MC multiplicity"}; // In MCGen multiplicity is defined by counting tracks
   ConfigurableAxis binsMassD{"binsMassD", {200, 1.3848, 2.3848}, "inv. mass (#pi K) (GeV/#it{c}^{2});entries"};
   ConfigurableAxis binsEta{"binsEta", {100, -5., 5.}, "#it{#eta}"};
@@ -265,8 +265,6 @@ struct HfCorrelatorD0Hadrons {
   ConfigurableAxis binsPoolBin{"binsPoolBin", {9, 0., 9.}, "PoolBin"};
   ConfigurableAxis binsCentFt0m{"binsCentFt0m", {100, 0., 100.}, "Centrality percentile (FT0M)"};
 
-  BinningType corrBinning{{zPoolBins, multPoolBins}, true};
-
   HistogramRegistry registry{"registry", {}, OutputObjHandlingPolicy::AnalysisObject};
 
   void init(InitContext&)
@@ -363,6 +361,7 @@ struct HfCorrelatorD0Hadrons {
                    SelectedTracks const& tracks,
                    SelectedCandidatesDataMl const& candidates)
   {
+    BinningType const corrBinning{{zPoolBins, multPoolBins}, true};
     // find leading particle
     if (correlateD0WithLeadingParticle) {
       leadingIndex = findLeadingParticle(tracks, etaTrackMax.value);
@@ -529,6 +528,7 @@ struct HfCorrelatorD0Hadrons {
                     SelectedCandidatesMcRecMl const& candidates,
                     aod::McParticles const& mcParticles)
   {
+    BinningType const corrBinning{{zPoolBins, multPoolBins}, true};
     // find leading particle
     if (correlateD0WithLeadingParticle) {
       leadingIndex = findLeadingParticle(tracks, etaTrackMax.value);
@@ -864,6 +864,7 @@ struct HfCorrelatorD0Hadrons {
                              SelectedCandidatesDataMl const& candidates,
                              SelectedTracks const& tracks)
   {
+    BinningType const corrBinning{{zPoolBins, multPoolBins}, true};
     for (const auto& collision : collisions) {
       registry.fill(HIST("hMultFT0M"), collision.multFT0M());
       registry.fill(HIST("hZvtx"), collision.posZ());
@@ -952,6 +953,7 @@ struct HfCorrelatorD0Hadrons {
                               SelectedTracksMcRec const& tracks,
                               aod::McParticles const& mcParticles)
   {
+    BinningType const corrBinning{{zPoolBins, multPoolBins}, true};
     auto tracksTuple = std::make_tuple(candidates, tracks);
     Pair<SelectedCollisions, SelectedCandidatesMcRecMl, SelectedTracksMcRec, BinningType> const pairMcRec{corrBinning, numberEventsMixed, -1, collisions, tracksTuple, &cache};
     bool isD0Prompt = false;