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Measurement of D-D-bar mixing using the ratio of lifetimes for the decays D-->K- pi + and K+K-

Author(s)
Fisher, Peter H.; Cowan, Ray Franklin; Dujmic, Denis; Henderson, Shawn Wesley; Sciolla, Gabriella; Spitznagel, M.; Yamamoto, R. K.; Zhao, M.; ... Show more Show less
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Alternative title
Measurement of D0-D̅ 0 mixing using the ratio of lifetimes for the decays D0→K-π+ and K+K-
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
We measure the rate of D0-D[over-bar] 0 mixing with the observable yCP=(τKpi/τKK)-1, where τKK and τKpi are, respectively, the mean lifetimes of CP-even D0-->K+K- and CP-mixed D0-->K-pi+ decays, using a data sample of 384  fb[superscript -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 yCP=[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 yCP obtained from a sample of D*+-->D0pi+ events, where the D0 decays to K-pi+, K+K-, and pi+pi-, 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 yCP=[1.16±0.22(stat)±0.18(syst)]%, which excludes the no-mixing hypothesis at 4.1σ.
Date issued
2009-10
URI
http://hdl.handle.net/1721.1/57458
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review D
Citation
BABAR Collaboration et al. “Measurement of D-D-bar mixing using the ratio of lifetimes for the decays D-->K- pi + and K+K-.” Physical Review D 80.7 (2009): 071103. © 2009 The American Physical Society.
Version: Final published version
ISSN
1550-7998

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