PWGJE: added QA histos for BC and col matching to the EMCAL task(AliceO2Group#1610)

Author: fjonasALICE

PWGJE/TableProducer/emcalCorrectionTask.cxx

@@ -76,6 +76,7 @@ struct EmcalCorrectionTask {
   OutputObj<TH2I> hCellRowCol{"hCellRowCol"};
   OutputObj<TH1F> hClusterE{"hClusterE"};
   OutputObj<TH2F> hClusterEtaPhi{"hClusterEtaPhi"};
+  OutputObj<TH1F> hCollisionMatching{"hCollisionMatching"};
 
   void init(InitContext const&)
   {
@@ -137,6 +138,7 @@ struct EmcalCorrectionTask {
     hCellRowCol.setObject(new TH2I("hCellRowCol", "hCellRowCol;Column;Row", 97, 0, 97, 600, 0, 600));
     hClusterE.setObject(new TH1F("hClusterE", "hClusterE", 200, 0.0, 100));
     hClusterEtaPhi.setObject(new TH2F("hClusterEtaPhi", "hClusterEtaPhi", 160, -0.8, 0.8, 72, 0, 2 * 3.14159));
+    hCollisionMatching.setObject(new TH1F("hCollisionMatching", "hCollisionMatching", 3, -0.5, 2.5)); // 0, no vertex,1 vertex found , 2 multiple vertices found
   }
 
   // void process(aod::Collision const& collision, soa::Filtered<aod::Tracks> const& fullTracks, aod::Calos const& cells)
@@ -220,6 +222,8 @@ struct EmcalCorrectionTask {
       float vx = 0, vy = 0, vz = 0;
       bool hasCollision = false;
       if (collisions.size() > 1) {
+        if (i == 0)
+          hCollisionMatching->Fill(2);
         LOG(error) << "More than one collision in the bc. This is not supported.";
       } else {
         // dummy loop to get the first collision
@@ -228,6 +232,8 @@ struct EmcalCorrectionTask {
           vy = col.posY();
           vz = col.posZ();
           hasCollision = true;
+          if (i == 0)
+            hCollisionMatching->Fill(1);
 
           // store positions of all tracks of collision
           auto groupedTracks = tracks.sliceBy(perCollision, col.globalIndex());
@@ -298,7 +304,9 @@ struct EmcalCorrectionTask {
         }   // end of collision loop
       }
       if (!hasCollision) {
-        LOG(warning) << "No vertex found for event. Assuming (0,0,0).";
+        if (i == 0)
+          hCollisionMatching->Fill(0);
+        // LOG(warning) << "No vertex found for event. Assuming (0,0,0).";
       }
 
       // Store the clusters in the table where a mathcing collision could