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Published June 29, 2011 | Published
Journal Article Open

Amplitude analysis of B^0 → K^+π^-π^0 and evidence of direct CP violation in B → K^* π decays


We analyze the decay B^0 → K^+π^-π^0 with a sample of 4.54×10^8 BB̅ events collected by the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC, and extract the complex amplitudes of seven interfering resonances over the Dalitz plot. These results are combined with amplitudes measured in B^0 → K_S^0π^+π^- decays to construct isospin amplitudes from B^0 → K^* π and B^0 → ρK decays. We measure the phase of the isospin amplitude Φ_(3/2), useful in constraining the Cabibbo-Kobayashi-Maskawa unitarity triangle angle γ and evaluate a CP rate asymmetry sum rule sensitive to the presence of new physics operators. We measure direct CP violation in B^0 → K^(*+)π^- decays at the level of 3σ when measurements from both B^0 → K^+π^-π^0 and B^0 → K_S^0π^+π^- decays are combined.

Additional Information

© 2011 American Physical Society. Received 1 May 2011; published 29 June 2011. We thank Michael Gronau, Dan Pirjol, and Jonathan Rosner for useful discussions. 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), the A. P. Sloan Foundation (USA), and the Binational Science Foundation (USA-Israel).

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