c Version 1.38

[u/mrichter/AliRoot.git] / TOF / AliTOFtracker.cxx

diff --git a/TOF/AliTOFtracker.cxx b/TOF/AliTOFtracker.cxx
index 0356c7e33c25f93a52554e0f182e3084ef897142..7cfb305f9ab0b17c99a19333bd8a757ef413736c 100644 (file)
--- a/TOF/AliTOFtracker.cxx
+++ b/TOF/AliTOFtracker.cxx
@@ -742,8 +742,14 @@ void AliTOFtracker::MatchTracks( Bool_t mLastStep){
     // Fill Reco-QA histos for Reconstruction
     fHRecNClus->Fill(nc);
     fHRecDist->Fill(mindist);
-    fHRecSigYVsP->Fill(mom,TMath::Sqrt(cov[0]));
-    fHRecSigZVsP->Fill(mom,TMath::Sqrt(cov[2]));
+    if (cov[0]>=0.)
+      fHRecSigYVsP->Fill(mom,TMath::Sqrt(cov[0]));
+    else
+      fHRecSigYVsP->Fill(mom,-TMath::Sqrt(-cov[0]));
+    if (cov[2]>=0.)
+      fHRecSigZVsP->Fill(mom,TMath::Sqrt(cov[2]));
+    else
+      fHRecSigZVsP->Fill(mom,-TMath::Sqrt(-cov[2]));
     fHRecSigYVsPWin->Fill(mom,dphi*sensRadius);
     fHRecSigZVsPWin->Fill(mom,dz);