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Published January 3, 2013 | Published
Journal Article Open

Measurement of D^0-D^0 mixing and CP violation in two-body D^0 decays


We present a measurement of D^0-D^0 mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D^0 mesons produced through the flavor-tagged process D^(*+)→D^0π^+, where D^0 decays to K^∓π^±, K^-K^+, or π^-π^+, along with the untagged decays D^0→K^∓π^± and D^0→K^-K^+. The lifetimes of the CP-even, Cabibbo-suppressed modes K^-K^+ and π^-π^+ are compared to that of the CP-mixed mode K^∓π^± in order to measure y_(CP) and ΔY. We obtain y_(CP)=[0.72±0.18(stat)±0.12(syst)]% and ΔY=[0.09±0.26(stat)±0.06(syst)]%, where ΔY constrains possible CP violation. The y_(CP) result excludes the null mixing hypothesis at 3.3σ significance. This analysis is based on an integrated luminosity of 468  fb^(-1) collected with the BABAR detector at the PEP-II asymmetric-energy e^+e^- collider.

Additional Information

© 2013 American Physical Society. Received 20 September 2012; published 3 January 2013. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the US Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l'Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Ciencia e Innovaciόn (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation (USA).

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Published - PhysRevD.87.012004.pdf


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