[PWGEM/Dilepton] fix TTCA weighting for global muons (AliceO2Group#14853)

Author: dsekihat

PWGEM/Dilepton/Core/Dilepton.h

@@ -895,8 +895,8 @@ struct Dilepton {
       if (cfgApplyWeightTTCA) {
         weight = map_weight[std::make_pair(t1.globalIndex(), t2.globalIndex())];
       }
+      // LOGF(info, "ev_id = %d, t1.sign() = %d, t2.sign() = %d, map_weight[std::make_pair(%d, %d)] = %f", ev_id, t1.sign(), t2.sign(), t1.globalIndex(), t2.globalIndex(), weight);
     }
-    // LOGF(info, "ev_id = %d, t1.sign() = %d, t2.sign() = %d, map_weight[std::make_pair(%d, %d)] = %f", ev_id, t1.sign(), t2.sign(), t1.globalIndex(), t2.globalIndex(), weight);
 
     ROOT::Math::PtEtaPhiMVector v1(t1.pt(), t1.eta(), t1.phi(), leptonM1);
     ROOT::Math::PtEtaPhiMVector v2(t2.pt(), t2.eta(), t2.phi(), leptonM2);
@@ -1527,7 +1527,6 @@ struct Dilepton {
       for (const auto& pairId : passed_pairIds) {
         auto t1 = tracks.rawIteratorAt(std::get<0>(pairId));
         auto t2 = tracks.rawIteratorAt(std::get<1>(pairId));
-        // LOGF(info, "std::get<0>(pairId) = %d, std::get<1>(pairId) = %d, t1.globalIndex() = %d, t2.globalIndex() = %d", std::get<0>(pairId), std::get<1>(pairId), t1.globalIndex(), t2.globalIndex());
 
         float n = 1.f; // include myself.
         for (const auto& ambId1 : t1.ambiguousElectronsIds()) {

PWGEM/Dilepton/Utils/EMTrackUtilities.h

@@ -137,18 +137,21 @@ bool checkMFTHitMap(T const& track)
 template <bool is_wo_acc = false, typename TTrack, typename TCut, typename TTracks>
 bool isBestMatch(TTrack const& track, TCut const& cut, TTracks const& tracks)
 {
-  // this is only for muon at forward rapidity
+  // this is only for global muons at forward rapidity
+  // Be careful! tracks are fwdtracks per DF.
   if (track.trackType() == o2::aod::fwdtrack::ForwardTrackTypeEnum::GlobalMuonTrack) {
     std::map<int64_t, float> map_chi2MCHMFT;
     map_chi2MCHMFT[track.globalIndex()] = track.chi2MatchMCHMFT(); // add myself
     for (const auto& glmuonId : track.globalMuonsWithSameMFTIds()) {
       const auto& candidate = tracks.rawIteratorAt(glmuonId);
-      if (candidate.trackType() == o2::aod::fwdtrack::ForwardTrackTypeEnum::GlobalMuonTrack) {
-        if (cut.template IsSelectedTrack<is_wo_acc>(candidate)) {
-          map_chi2MCHMFT[candidate.globalIndex()] = candidate.chi2MatchMCHMFT();
+      if (track.mchtrackId() != candidate.mchtrackId() && track.mfttrackId() == candidate.mfttrackId()) {
+        if (candidate.trackType() == o2::aod::fwdtrack::ForwardTrackTypeEnum::GlobalMuonTrack) {
+          if (cut.template IsSelectedTrack<is_wo_acc>(candidate)) {
+            map_chi2MCHMFT[candidate.globalIndex()] = candidate.chi2MatchMCHMFT();
+          }
         }
       }
-    }
+    } // end of glmuonId
 
     auto it = std::min_element(map_chi2MCHMFT.begin(), map_chi2MCHMFT.end(), [](decltype(map_chi2MCHMFT)::value_type& l, decltype(map_chi2MCHMFT)::value_type& r) -> bool { return l.second < r.second; }); // search for minimum matching-chi2