Releasing the covariance matrix of intersection point along the track direction
authorbelikov <belikov@f7af4fe6-9843-0410-8265-dc069ae4e863>
Thu, 3 May 2007 10:48:47 +0000 (10:48 +0000)
committerbelikov <belikov@f7af4fe6-9843-0410-8265-dc069ae4e863>
Thu, 3 May 2007 10:48:47 +0000 (10:48 +0000)
STEER/AliTrackFitterKalman.cxx

index 5251c96..7d46f9f 100755 (executable)
@@ -278,6 +278,14 @@ Bool_t AliTrackFitterKalman::GetPCA(const AliTrackPoint &p, AliTrackPoint &i) co
 
   TMatrixD iC(tC,TMatrixD::kMult,tmW);
   iC*=mC;
+  Double_t sig2=1.;  // Releasing the matrix by 1 cm along the track direction 
+  iC(0,0) += vx*vx*sig2;
+  iC(0,1) += vx*sig2; 
+  iC(1,1) += sig2;
+  iC(0,2) += vx*vz*sig2;
+  iC(1,2) += vz*sig2;
+  iC(2,2) += vz*vz*sig2;
+
 
   Float_t cov[6]={
     iC(0,0), iC(0,1), iC(0,2),