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Published November 1, 2009 | Published
Journal Article Open

Measurement of CP violation observables and parameters for the decays B^± → DK^(*±)


We study the decay B^- → DK^(*-) using a sample of 379 × 10^6 Υ(4S) → BB(overbar) events collected with the BABAR detector at the PEP-II B factory. We perform a Gronau-London-Wyler analysis where the D meson decays into either a CP-even (CP+) eigenstate (K^+K^-, π^+π^-), CP-odd (CP-) eigenstate (K(^0_S)π^0, K(^0_S)ϕ, K(^0_S)ω) or a non-CP state (KT-π^+). We also analyze D meson decays into K^+π^- from a Cabibbo-favored D(overbar)^0 decay or doubly suppressed D^0 decay [Atwood-Dunietz-Soni (ADS) analysis]. We measure observables that are sensitive to the Cabibbo-Kobayashi-Maskawa angle γ: the partial-rate charge asymmetries A_(CP±), the ratios R_(CP±) of the B-decay branching fractions in CP± and non-CP decay, the ratio R_(ADS) of the charge-averaged branching fractions, and the charge asymmetry A_(ADS) of the ADS decays: A_(CP+) = 0.09±0.13±0.06, A_(CP-) = -0.23±0.21±0.07, R_(CP+) = 2.17±0.35±0.09, R_(CP-) = 1.03±0.27±0.13, R_(ADS) = 0.066±0.031±0.010, and A_(ADS) = -0.34±0.43±0.16, where the first uncertainty is statistical and the second is systematic. Combining all the measurements and using a frequentist approach yields the magnitude of the ratio between the Cabibbo-suppressed and favored amplitudes, r_B = 0.31 with a one (two) sigma confidence level interval of [0.24, 0.38] ([0.17, 0.43]). The value r_ B = 0 is excluded at the 3.3 sigma level. A similar analysis excludes values of γ in the intervals [0, 7]°, [55, 111]°, and [175, 180]° ([85, 99]°) at the one (two) sigma confidence level.

Additional Information

© 2009 American Physical Society. Received 23 September 2009; published 3 November 2009. 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 a` l'Energie Atomique and Institut National de Physique Nucle´aire et de Physique des Particules (France), the Bundesministerium fu¨ r 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 Educacio´n y Ciencia (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.

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