Phys. Rev. D 80, 071103(R) (2009) [8 pages]

Measurement of D⁰-D̅ ⁰ mixing using the ratio of lifetimes for the decays D⁰→K^-π⁺ and K⁺K^-

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B. Aubert et al.
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Received 7 August 2009; published 29 October 2009

We measure the rate of D⁰-D̅ ⁰ mixing with the observable y_CP=(τ_Kπ/τ_KK)-1, where τ_KK and τ_Kπ are, respectively, the mean lifetimes of CP-even D⁰→K⁺K^- and CP-mixed D⁰→K^-π⁺ decays, using a data sample of 384 fb^-1 collected by the BABAR detector at the SLAC PEP-II asymmetric-energy B Factory. From a sample of D⁰ and D̅ ⁰ decays where the initial flavor of the decaying meson is not determined, we obtain y_CP=[1.12±0.26(stat)±0.22(syst)]%, which excludes the no-mixing hypothesis at 3.3σ, including both statistical and systematic uncertainties. This result is in good agreement with a previous BABAR measurement of y_CP obtained from a sample of D^*+→D⁰π⁺ events, where the D⁰ decays to K^-π⁺, K⁺K^-, and π⁺π^-, which is disjoint with the untagged D⁰ events used here. Combining the two results taking into account statistical and systematic uncertainties, where the systematic uncertainties are assumed to be 100% correlated, we find y_CP=[1.16±0.22(stat)±0.18(syst)]%, which excludes the no-mixing hypothesis at 4.1σ.

URL:

http://link.aps.org/doi/10.1103/PhysRevD.80.071103

DOI:

10.1103/PhysRevD.80.071103

PACS:

13.25.Ft, 11.30.Er, 12.15.Ff

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Phys. Rev. D 80, 071103(R) (2009) [8 pages]

Measurement of D0-D̅ 0 mixing using the ratio of lifetimes for the decays D0→K-π+ and K+K-

Measurement of D⁰-D̅ ⁰ mixing using the ratio of lifetimes for the decays D⁰→K^-π⁺ and K⁺K^-