Perform check on cos(crossing_angle_with_padrow) in GetCrossingAngle().

Every once in a while this number is equal to one, which results in
return value being NaN.

diff --git a/HLT/src/AliL3Track.cxx b/HLT/src/AliL3Track.cxx
index 6a5a48595cd0ef74a6e18f654c38c2cf15233bbf..03e9bab18f4f41b51325fd39b3abea5381ad1048 100644 (file)
--- a/HLT/src/AliL3Track.cxx
+++ b/HLT/src/AliL3Track.cxx
@@ -189,8 +189,9 @@ Double_t AliL3Track::GetCrossingAngle(Int_t padrow)
   tangent[1] = (xyz[0] - GetCenterX())/GetRadius();
   
   Double_t perp_padrow[2] = {1,0}; //locally in slice
-
+  
   Double_t cos_beta = fabs(tangent[0]*perp_padrow[0] + tangent[1]*perp_padrow[1]);
+  if(cos_beta > 1) cos_beta=1;
   return acos(cos_beta);
 }