Measurement of D-D-bar mixing using the ratio of lifetimes for the decays D-->K- pi + and K+K-
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Aubert-2009-Measurement of D.pdf
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Author(s)
Fisher, Peter H.
Cowan, Ray Franklin
Dujmic, Denis
Henderson, Shawn Wesley
Sciolla, Gabriella
Spitznagel, M.
Yamamoto, R. K.
Zhao, M.
Alternative Title
Measurement of D0-D̅ 0 mixing using the ratio of lifetimes for the decays D0→K-π+ and K+K-
Date Issued
October 2009
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.80.071103
