Suppress hardcoded cuts on seed SigY/Z applied during TPC tracking

Since the cluster errors may strongly increase in some TPC region, leading to large value of TPC seed cov.matrix, cutting on covaraince values leads to track loss. Hardcoded cuts are suppressed in the mode of distortion corrections
sevdokim · May 22, 2016 · 54211a5 · 54211a5
1 parent 640a88a
commit 54211a5
Showing 1 changed file with 11 additions and 4 deletions.
diff --git a/TPC/TPCrec/AliTPCtracker.cxx b/TPC/TPCrec/AliTPCtracker.cxx
@@ -2975,7 +2975,8 @@ Int_t AliTPCtracker::FollowToNextCluster(AliTPCseed & t, Int_t nr) {
 
   } else {
     if (fIteration==0){
-      if ( t.GetNumberOfClusters()>18 && ( (t.GetSigmaY2()+t.GetSigmaZ2())>0.16 + fExtraClErrYZ2 )) t.SetRemoval(10);      
+      //RS: with distortions related cluster errors the track error may grow, don't use this cut
+      //if ( t.GetNumberOfClusters()>18 && ( (t.GetSigmaY2()+t.GetSigmaZ2())>0.16 + fExtraClErrYZ2 )) t.SetRemoval(10); 
       if ( t.GetNumberOfClusters()>18 && t.GetChi2()/t.GetNumberOfClusters()>6 ) t.SetRemoval(10);      
 
       if (( (t.GetNFoundable()*0.5 > t.GetNumberOfClusters()) || t.GetNoCluster()>15)) t.SetRemoval(10);
@@ -4691,7 +4692,9 @@ void AliTPCtracker::MakeSeeds3Dist(TObjArray * arr, Int_t sec, Int_t i1, Int_t i
 	  Int_t foundable,found,shared;
 	  GetSeedClusterStatistic(track,(i1+i2)/2,i1, found, foundable, shared, kTRUE); //RS: seeds don't keep their clusters
 	  //RS track->GetClusterStatistic((i1+i2)/2,i1, found, foundable, shared, kTRUE);
-	  if ((found<0.55*foundable)  || shared>0.5*found || (track->GetSigmaY2()+track->GetSigmaZ2())>0.5){
+	  if ((found<0.55*foundable)  || shared>0.5*found) {
+	    //RS: with distortions related cluster errors the track error may grow, don't use this cut
+	    //|| (track->GetSigmaY2()+track->GetSigmaZ2())>0.5){
 	    MarkSeedFree(seed); seed = 0;
 	    continue;
 	  }
@@ -5280,7 +5283,9 @@ void AliTPCtracker::MakeSeeds5Dist(TObjArray * arr, Int_t sec, Int_t i1, Int_t i
       nin++;      
       FollowProlongation(*track, i1-7,1);
       if (track->GetNumberOfClusters() < track->GetNFoundable()*0.75 || 
-	  track->GetNShared()>0.6*track->GetNumberOfClusters() || ( track->GetSigmaY2()+ track->GetSigmaZ2())>0.6){
+	  track->GetNShared()>0.6*track->GetNumberOfClusters()) {
+	//RS: with distortions related cluster errors the track error may grow, don't use this cut
+	//|| ( track->GetSigmaY2()+ track->GetSigmaZ2())>0.6){
 	MarkSeedFree( seed ); seed = 0;
 	continue;
       }
@@ -5294,7 +5299,9 @@ void AliTPCtracker::MakeSeeds5Dist(TObjArray * arr, Int_t sec, Int_t i1, Int_t i
 
       if (track->GetNumberOfClusters()<(i1-i2)*0.5 || 
 	  track->GetNumberOfClusters()<track->GetNFoundable()*0.7 || 
-	  track->GetNShared()>2. || track->GetChi2()/track->GetNumberOfClusters()>6 || ( track->GetSigmaY2()+ track->GetSigmaZ2())>0.5 ) {
+	  track->GetNShared()>2. || track->GetChi2()/track->GetNumberOfClusters()>6) {
+	//RS: with distortions related cluster errors the track error may grow, don't use this cut
+	//|| ( track->GetSigmaY2()+ track->GetSigmaZ2())>0.5 ) {
 	MarkSeedFree( seed ); seed = 0;
 	continue;
       }