Measurements of branching fractions and CP asymmetries and studies of angular distributions for B → ϕϕK decays

Creators: Lees, J. P.; Cheng, C. H.; Doll, D. A.; Echenard, B.; Flood, K. T.; Hitlin, D. G.; Ongmongkolkul, P.; Porter, F. C.; Rakitin, A. Y.

Abstract

We present branching fraction and CP asymmetry measurements as well as angular studies of B → ϕϕK decays using 464×10^6 BB̅ events collected by the BABAR experiment. The branching fractions are measured in the ϕϕ invariant mass range below the η_c resonance (m_(ϕϕ)<2.85 GeV). We find B(B^+ → ϕϕK^+)=(5.6±0.5±0.3)×10^(-6) and B(B^0 → ϕϕK^0)=(4.5±0.8±0.3)×10^(-6), where the first uncertainty is statistical and the second systematic. The measured direct CP asymmetries for the B^± decays are A_(CP) = -0.10±0.08±0.02 below the η_c threshold (m_(ϕϕ)<2.85 GeV) and A_(CP) =0.09±0.10±0.02 in the η_c resonance region (m_ϕϕ in [2.94, 3.02] GeV). Angular distributions are consistent with J^P = 0^- in the η_c resonance region and favor J^P = 0^+ below the η_c resonance.

Additional Information

© 2011 American Physical Society. Received 25 May 2011; published 5 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 US 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, 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 AP. Sloan Foundation (USA), and the Binational Science Foundation (USA-Israel).

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