Title

Lifetime differences, direct CP violation, and partial widths in D0 meson decays to K+K- and π+ π-

Document Type

Article

Publication Date

5-1-2002

Abstract

We describe several measurements using the decays D →K K and π π . We find the ratio of partial widths, Γ(D →K K )/Γ (D →π π ), to be 2.96±0.16±0.15, where the first error is statistical and the second is systematic. We observe no evidence for direct CP violation, obtaining A (KK)=(0.0±2.2±0.8)% and A (ππ)=(1.9±3.2±0.8)%. In the limit of no CP violation we measure the mixing parameter y =-0.012±0.025±0.014 by measuring the lifetime difference between D →K K or π π and the CP neutral state, D →K π . We see no evidence for mixing. 0 + - + - 0 + - 0 + - 0 + - + - 0 - + CP CP CP

Publication Name

Physical Review D - Particles, Fields, Gravitation and Cosmology

Volume Number

65

First Page

920011

Last Page

920018

Issue Number

9 A

Article

092001

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