Abstract: |
We present a measurement of relative partial widths and decay rate CP asymmetries in K−K+ and π−π+ decays of D0 mesons produced in pp¯ collisions at s√=1. 96 TeV. We use a sample of 2×105 D*+→D0π+ (and charge conjugate) decays with the D0 decaying to K−π+, K−K+, and π−π+, corresponding to 123 pb−1 of data collected by the Collider Detector at Fermilab II experiment at the Fermilab Tevatron collider. No significant direct CP violation is observed. We measure Γ(D0→K−K+)/Γ(D0→K−π+)=0. 0992±0. 0011±0. 0012, Γ(D0→π−π+)/Γ(D0→K−π+)=0. 035 94±0. 000 54±0. 000 40, ACP(K−K+)=(2. 0±1. 2±0. 6)%, and ACP(π−π+)=(1. 0±1. 3±0. 6)%, where, in all cases, the first uncertainty is statistical and the second is systematic. |