par Acosta, Darin E.;De Lentdecker, Gilles ; [et al.]
Référence Physical review letters, 94, 12, page (1-7), 122001
Publication Publié, 2005
Article révisé par les pairs
Résumé : 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 pp̄ 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 ±0.0992 ±0.0012, γ(D0→K -π+)/γ(D0→K -π+) = 0.03594 ± 0.00054 ±0.00040, A CP(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. © 2005 The American Physical Society.