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Measurement of D-0-(D)over-bar(0) mixing using the ratio of lifetimes for the decays D-0 -> K-pi(+), K-K+, and pi(-)pi(+)

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BABAR Collaboration (Including:

Aubert, B., Bona, M., Karyotakis, Y., Lees, J. P., Poireau, V., Prudent, X., Tisserand, V., Zghiche, A., Garra Tico, J., Grauges, E. et al.
). (2008) Measurement of D-0-(D)over-bar(0) mixing using the ratio of lifetimes for the decays D-0 -> K-pi(+), K-K+, and pi(-)pi(+). Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.78 (No.1). Article No. 011105. ISSN 1550-7998

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Abstract

We present a measurement of D-0-(D) over bar (0) mixing parameters using the ratios of lifetimes extracted from a sample of D-0 mesons produced through the process D*+ -> D-0 pi(+), which decay to K-pi(+), K-K+, or pi(-)pi(+). The lifetimes of the CP-even, Cabibbo-suppressed modes K-K+ and pi(-)pi(+) are compared with that of the CP-mixed, Cabibbo-favored mode K-pi(+) to obtain a measurement of y(CP), which in the limit of CP 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(CP) = [1.24 +/- 0.39(stat) +/- 0.13(syst)]%, which is evidence for D-0-(D) over bar (0) mixing at the 3 sigma level, and Delta Y = [-0.26 +/- 0.36(stat) +/- 0.08(syst)]%, where Delta Y constrains possible CP violation. Combining this result with a previous BABAR measurement of y(CP) obtained from a separate sample of D-0 -> K-K+ events, we obtain y(CP) = [1.03 +/- 0.33(stat) +/- 0.19(syst)]%.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher: American Physical Society
ISSN: 1550-7998
Date: July 2008
Volume: Vol.78
Number: No.1
Number of Pages: 9
Page Range: Article No. 011105
Identification Number: 10.1103/PhysRevD.78.011105
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: U. S. Department of Energy and National Science Foundation, Natural Sciences and Engineering Research Council (Canada), Commissariat a l'Energie Atomique and Institut National de Physique Nucleaire et de Physique des Particules (France), Bundesministerium fur Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), Istituto Nazionale di Fisica Nucleare (Italy), Foundation for Fundamental Research on Matter (The Netherlands), Research Council of Norway, Ministry of Education and Science of the Russian Federation, Ministerio de Educacion y Ciencia (Spain), Science and Technology Facilities Council (United Kingdom), Marie Curie IEF program (European Union), A. P. Sloan Foundation
URI: http://wrap.warwick.ac.uk/id/eprint/29465

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