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Revised version of Theta() function
authorbelikov <belikov@f7af4fe6-9843-0410-8265-dc069ae4e863>
Wed, 10 Oct 2007 07:23:27 +0000 (07:23 +0000)
committerbelikov <belikov@f7af4fe6-9843-0410-8265-dc069ae4e863>
Wed, 10 Oct 2007 07:23:27 +0000 (07:23 +0000)
STEER/AliExternalTrackParam.cxx patch | blob | blame | history

diff --git a/STEER/AliExternalTrackParam.cxx b/STEER/AliExternalTrackParam.cxx
index 84f001e2e525debeab520184abb5bcd605cbf037..eaaf1ada12ac638975168418219bf06f9d068f73 100644 (file)
--- a/STEER/AliExternalTrackParam.cxx
+++ b/STEER/AliExternalTrackParam.cxx
@@ -1016,7 +1016,7 @@ Double_t AliExternalTrackParam::Pz() const {
 Double_t AliExternalTrackParam::Theta() const {
   // return theta angle of momentum
 
-  return TMath::ATan2(Pt(), Pz());
+  return 0.5*TMath::Pi() - TMath::ATan(fP[3]);
 }
 
 Double_t AliExternalTrackParam::Phi() const {