Fix fake/correct status for barrel tracks

The fMcMask bit 15 (fake global track label or TOF_label != TPC_lable) was
wrong since original TOF cluster label (set in the reconstruction) was compared
with TPC remapped label prepared for AOD storage.
In fact, we don't need to consider separately the global_label.isFake and TOF-TPC mismach:
TOF is the last detector in the matching process and the global track label is determined
by the TPC track label. Hence, if the TOF match is present but its cluster is not contributed
by the TPC track, the global label isFake will be necessarilly true, and vice versa.

Also, the status of bit 13 (flagging ITS-TPC mismatch) was covering only track-to-track
matches but not those from the afterburner.

Now settings of fakeness relies on the isFake status from the reconstruction.

Author: shahor02

DataFormats/Detectors/GlobalTracking/src/RecoContainer.cxx

@@ -1447,7 +1447,7 @@ RecoContainer::GlobalIDSet RecoContainer::getSingleDetectorRefs(GTrackID gidx) c
     table[GTrackID::MCH] = parent0.getMCHRef();
     table[GTrackID::MID] = parent0.getMIDRef();
   }
-  return std::move(table);
+  return table;
 }
 
 //________________________________________________________

Detectors/AOD/include/AODProducerWorkflow/AODProducerWorkflowSpec.h

@@ -482,8 +482,6 @@ class AODProducerWorkflowDPL : public Task
   // using -1 as dummies for AOD
   struct MCLabels {
     uint32_t labelID = -1;
-    uint32_t labelITS = -1;
-    uint32_t labelTPC = -1;
     uint16_t labelMask = 0;
     uint8_t fwdLabelMask = 0;
   };

Detectors/AOD/src/AODProducerWorkflowSpec.cxx

@@ -109,6 +109,7 @@ using PVertex = o2::dataformats::PrimaryVertex;
 using GIndex = o2::dataformats::VtxTrackIndex;
 using DataRequest = o2::globaltracking::DataRequest;
 using GID = o2::dataformats::GlobalTrackID;
+using DetID = o2::detectors::DetID;
 using SMatrix55Sym = ROOT::Math::SMatrix<double, 5, 5, ROOT::Math::MatRepSym<double, 5>>;
 
 namespace o2::aodproducer
@@ -1058,9 +1059,9 @@ void AODProducerWorkflowDPL::fillMCTrackLabelsTable(MCTrackLabelCursorType& mcTr
                                                     int vertexId)
 {
   // labelMask (temporary) usage:
-  //   bit 13 -- ITS/TPC or TPC/TOF labels are not equal
+  //   bit 13 -- ITS/TPC with ITS label (track of AB tracklet) different from TPC
   //   bit 14 -- isNoise() == true
-  //   bit 15 -- isFake() == true
+  //   bit 15 -- isFake() == true (defined by the fakeness of the top level global track, i.e. if TOF is present, fake means that the track of the TPC label does not contribute to TOF cluster)
   // labelID = -1 -- label is not set
 
   for (int src = GIndex::NSources; src--;) {
@@ -1084,7 +1085,7 @@ void AODProducerWorkflowDPL::fillMCTrackLabelsTable(MCTrackLabelCursorType& mcTr
 
       if (GIndex::includesSource(src, mInputSources)) {
         auto mcTruth = data.getTrackMCLabel(trackIndex);
-        MCLabels labelHolder;
+        MCLabels labelHolder{};
         if ((src == GIndex::Source::MFT) || (src == GIndex::Source::MFTMCH) || (src == GIndex::Source::MCH) || (src == GIndex::Source::MCHMID)) { // treating mft and fwd labels separately
           if (!needToStore(src == GIndex::Source::MFT ? mGIDToTableMFTID : mGIDToTableFwdID)) {
             continue;
@@ -1110,51 +1111,22 @@ void AODProducerWorkflowDPL::fillMCTrackLabelsTable(MCTrackLabelCursorType& mcTr
             continue;
           }
           if (mcTruth.isValid()) { // if not set, -1 will be stored
-            labelHolder.labelID = (mToStore[mcTruth.getSourceID()][mcTruth.getEventID()])[mcTruth.getTrackID()];
-          }
-          // treating possible mismatches and fakes for global tracks
-          auto contributorsGID = data.getSingleDetectorRefs(trackIndex);
-          bool isSetTPC = contributorsGID[GIndex::Source::TPC].isIndexSet();
-          bool isSetITS = contributorsGID[GIndex::Source::ITS].isIndexSet();
-          bool isSetTOF = contributorsGID[GIndex::Source::TOF].isIndexSet();
-          bool isTOFFake = true;
-          if (isSetTPC && (isSetITS || isSetTOF)) {
-            auto mcTruthTPC = data.getTrackMCLabel(contributorsGID[GIndex::Source::TPC]);
-            if (mcTruthTPC.isValid()) {
-              labelHolder.labelTPC = (mToStore[mcTruthTPC.getSourceID()][mcTruthTPC.getEventID()])[mcTruthTPC.getTrackID()];
-              labelHolder.labelID = labelHolder.labelTPC;
-            }
-            if (isSetITS) {
-              auto mcTruthITS = data.getTrackMCLabel(contributorsGID[GIndex::Source::ITS]);
-              if (mcTruthITS.isValid()) {
-                labelHolder.labelITS = (mToStore[mcTruthITS.getSourceID()][mcTruthITS.getEventID()])[mcTruthITS.getTrackID()];
-              }
-              if (labelHolder.labelITS != labelHolder.labelTPC) {
-                LOG(debug) << "ITS-TPC MCTruth: labelIDs do not match at " << trackIndex.getIndex() << ", src = " << src;
-                labelHolder.labelMask |= (0x1 << 13);
-              }
+            labelHolder.labelID = (mToStore[mcTruth.getSourceID()][mcTruth.getEventID()])[mcTruth.getTrackID()]; // defined by TPC if it contributes, otherwise: by ITS
+            if (mcTruth.isFake()) {
+              labelHolder.labelMask |= (0x1 << 15);
             }
-            if (isSetTOF) {
-              const auto& labelsTOF = data.getTOFClustersMCLabels()->getLabels(contributorsGID[GIndex::Source::TOF]);
-              for (auto& mcLabel : labelsTOF) {
-                if (!mcLabel.isValid()) {
-                  continue;
-                }
-                if (mcLabel == labelHolder.labelTPC) {
-                  isTOFFake = false;
-                  break;
+            if (trackIndex.includesDet(DetID::TPC) && trackIndex.getSource() != GIndex::Source::TPC) { // this is global track
+              auto contributorsGID = data.getSingleDetectorRefs(trackIndex);
+              if (contributorsGID[GIndex::Source::ITSTPC].isIndexSet()) { // there is a match to ITS tracks or ITSAB tracklet!
+                if (data.getTrackMCLabel(contributorsGID[GIndex::Source::ITSTPC]).isFake()) {
+                  labelHolder.labelMask |= (0x1 << 13);
                 }
               }
             }
-          }
-          if (mcTruth.isFake() || (isSetTOF && isTOFFake)) {
-            labelHolder.labelMask |= (0x1 << 15);
-          }
-          if (mcTruth.isNoise()) {
+          } else if (mcTruth.isNoise()) {
             labelHolder.labelMask |= (0x1 << 14);
           }
-          mcTrackLabelCursor(labelHolder.labelID,
-                             labelHolder.labelMask);
+          mcTrackLabelCursor(labelHolder.labelID, labelHolder.labelMask);
         }
       }
     }