impoved num precision

[u/mrichter/AliRoot.git] / HLT / TPCLib / tracking-ca / AliHLTTPCCATrackerComponent.cxx

diff --git a/HLT/TPCLib/tracking-ca/AliHLTTPCCATrackerComponent.cxx b/HLT/TPCLib/tracking-ca/AliHLTTPCCATrackerComponent.cxx
index 13427c4b1836f98a0b9eda7e8176f2cbebd6d2cb..1a2e03a23ce2919f0b49b01f3f23fa60ea045f03 100644 (file)
--- a/HLT/TPCLib/tracking-ca/AliHLTTPCCATrackerComponent.cxx
+++ b/HLT/TPCLib/tracking-ca/AliHLTTPCCATrackerComponent.cxx
@@ -792,7 +792,7 @@ int AliHLTTPCCATrackerComponent::DoEvent
                          currOutTracklet->fZ0err = tp.GetSigmaZ2();
                          float h = -currOutTracklet->fPt * currOutTracklet->fPt;
                          currOutTracklet->fPterr = h * h * tp.GetSigma1Pt2();
-                         h = 1. / TMath::Sqrt( 1 - snp * snp );
+                         h = 1. / TMath::Sqrt((1.-snp)*(1.+snp));
                          currOutTracklet->fPsierr = h * h * tp.GetSigmaSnp2();
                          currOutTracklet->fTglerr = tp.GetSigmaTgl2();