Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/131622
Title: Measurement of D0−¯¯¯D0 mixing using the ratio of lifetimes for the decays D0→K−π+, K−K+, and π−π+
Author: Garra Ticó, Jordi
Graugés Pous, Eugeni
BABAR Collaboration
Keywords: Física de partícules
Experiments
Particle physics
Experiments
Issue Date: 23-Jul-2009
Publisher: American Physical Society
Abstract: We present a measurement of D 0 − ¯¯¯ D 0 mixing parameters using the ratios of lifetimes extracted from a sample of D 0 mesons produced through the process D * + → D 0 π + , which decay to K − π + , K − K + , or π − π + . The lifetimes of the C P -even, Cabibbo-suppressed modes K − K + and π − π + are compared with that of the C P -mixed, Cabibbo-favored mode K − π + to obtain a measurement of y C P , which in the limit of C P conservation corresponds to the mixing parameter y . The analysis is based on a data sample of 384     fb − 1 collected by the BABAR detector at the PEP-II asymmetric-energy e + e − collider. We obtain y C P = [ 1.24 ± 0.39 ( stat ) ± 0.13 ( syst ) ] % , which is evidence for D 0 − ¯¯¯ D 0 mixing at the 3 σ level, and Δ Y = [ − 0.26 ± 0.36 ( stat ) ± 0.08 ( syst ) ] % , where Δ Y constrains possible C P violation. Combining this result with a previous BABAR measurement of y C P obtained from a separate sample of D 0 → K − K + events, we obtain y C P = [ 1.03 ± 0.33 ( stat ) ± 0.19 ( syst ) ] % .
Note: Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.78.011105
It is part of: Physical Review D, 2009, vol. 80, num. 7, p. 071103
URI: http://hdl.handle.net/2445/131622
Related resource: https://doi.org/10.1103/PhysRevD.78.011105
ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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