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Published July 6, 2011 | Published
Journal Article Open

Search for b → u transitions in B^± → [K^∓π^±π^0]_DK^± decays


We present a study of the decays B^±→DK^± with D mesons reconstructed in the K^+π^-π^0 or K^-π^+π^0 final states, where D indicates a D^0 or a D̅^0 meson. Using a sample of 474×10^6 BB̅ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e^+e^- collider at SLAC, we measure the ratios R^±≡Γ(B^±→[K^∓π^±π^0]_DK^±)/Γ(B^±→[K^±π^∓π^0]_DK^±). We obtain R^+=(5(-10)^(+12)(stat)_(-4)^(+2)(syst))×10^-3 and R^-=(12_(-10)^(+12)(stat)_(-5)^(+3)(syst))×10^(-3), from which we extract the upper limits at 90% probability: R^+<23×10^(-3) and R^-<29×10^(-3). Using these measurements, we obtain an upper limit for the ratio r_B of the magnitudes of the b→u and b→c amplitudes r_B<0.13 at 90% probability.

Additional Information

© 2011 American Physical Society. Received 22 April 2011; published 6 July 2011. 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 (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), the A. P. Sloan Foundation (USA), and the Binational Science Foundation (USA-Israel).

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