Phys. Rev. Lett. 94, 122001 (2005) [7 pages]

Measurement of Partial Widths and Search for Direct CP Violation in D⁰ Meson Decays to K^-K⁺ and π^-π⁺

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D. Acosta et al. CDF Collaboration
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Received 6 August 2004; published 1 April 2005

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 pp̅ 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, A_CP(K^-K⁺)=(2.0±1.2±0.6)%, and A_CP(π^-π⁺)=(1.0±1.3±0.6)%, where, in all cases, the first uncertainty is statistical and the second is systematic.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.94.122001

DOI:

10.1103/PhysRevLett.94.122001

PACS:

14.40.Lb, 13.25.Ft

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Phys. Rev. Lett. 94, 122001 (2005) [7 pages]

Measurement of Partial Widths and Search for Direct CP Violation in D0 Meson Decays to K-K+ and π-π+

Measurement of Partial Widths and Search for Direct CP Violation in D⁰ Meson Decays to K^-K⁺ and π^-π⁺