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Published June 22, 2012 | Published
Journal Article Open

Study of CP violation in Dalitz-plot analyses of B^0 → K^+K^-K^0_S, B^+ → K^+K^-K^+, and B^+ → K^0_S K^0_S K^+


We perform amplitude analyses of the decays B^0→K^+K^-K_S^0, B^+→K^+K^-K^+, and B^+→K_S^0K_S^0K^+, and measure CP-violating parameters and partial branching fractions. The results are based on a data sample of approximately 470×10^6 BB decays, collected with the BABAR detector at the PEP-II asymmetric-energy B factory at the SLAC National Accelerator Laboratory. For B^+→K^+K^-K^+, we find a direct CP asymmetry in B^+→ϕ(1020)K^+ of A_(CP)=(12.8±4.4±1.3)%, which differs from zero by 2.8σ. For B^0→K^+K^-K_S^0, we measure the CP-violating phase β_(eff)(ϕ(1020)K_S^0)=(21±6±2)°. For B^+→K_S^0K_S^0K^+, we measure an overall direct CP asymmetry of A_(CP)=(4_(-5)^(+4)±2)%. We also perform an angular-moment analysis of the three channels and determine that the f_X(1500) state can be described well by the sum of the resonances f_0(1500), f_2^′(1525), and f_0(1710).

Additional Information

© 2012 American Physical Society. Received 31 January 2012; published 22 June 2012. 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 the 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, the 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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