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Published March 18, 2013 | Published
Journal Article Open

Search for CP violation in the decays D^± → K_S^0K^±, D_s^± → K_s^0K^± and D^±_s → K_s^0π^±


We report a search for CP violation in the decay modes D^±→K_S^0K^±, D_s^±→K_S^0K^±, and D_s^±→K_S^0π^± using a data set corresponding to an integrated luminosity of 469  fb^(-1) collected with the BABAR detector at the PEP-II asymmetric energy e^+e^- storage rings. The decay rate CP asymmetries, A_(CP), are determined to be (+0.13±0.36(stat)±0.25(syst))%, (-0.05±0.23(stat)±0.24(syst))%, and (+0.6±2.0(stat)±0.3(syst))%, respectively. These measurements are consistent with zero, and also with the Standard Model prediction [(-0.332±0.006)% for the D^±→K_S^0K^± and D_s^±→K_S^0K^± modes, and (+0.332±0.006)% for the D_s^±→K_S^0π^± mode]. They are the most precise determinations to date.

Additional Information

© 2013 American Physical Society. Received 14 December 2012; published 18 March 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 U.S. 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 (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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