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Measurement of D0D¯0 mixing using the ratio of lifetimes for the decays D0Kπ+, KK+, and ππ+

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 78, 011105(R) – Published 23 July 2008

Abstract

We present a measurement of D0D¯0 mixing parameters using the ratios of lifetimes extracted from a sample of D0 mesons produced through the process D*+D0π+, which decay to Kπ+, KK+, or ππ+. The lifetimes of the CP-even, Cabibbo-suppressed modes KK+ and ππ+ are compared with that of the CP-mixed, Cabibbo-favored mode Kπ+ to obtain a measurement of yCP, which in the limit of CP conservation corresponds to the mixing parameter y. The analysis is based on a data sample of 384fb1 collected by the BABAR detector at the PEP-II asymmetric-energy e+e collider. We obtain yCP=[1.24±0.39(stat)±0.13(syst)]%, which is evidence for D0D¯0 mixing at the 3σ level, and ΔY=[0.26±0.36(stat)±0.08(syst)]%, where ΔY constrains possible CP violation. Combining this result with a previous BABAR measurement of yCP obtained from a separate sample of D0KK+ events, we obtain yCP=[1.03±0.33(stat)±0.19(syst)]%.

  • Figure
  • Figure
  • Received 20 December 2007

DOI:https://doi.org/10.1103/PhysRevD.78.011105

©2008 American Physical Society

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Vol. 78, Iss. 1 — 1 July 2008

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