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Published February 1, 2011 | Published
Journal Article Open

Search for the decay B^0 → γγ


We report the result of a search for the rare decay B^0 → γγ in 426  fb^(-1) of data, corresponding to 226 × 10^6 B^0B̅ ^0 pairs, collected on the Υ(4S) resonance at the PEP-II asymmetric-energy e^+e^- collider using the BABAR detector. We use a maximum likelihood fit to extract the signal yield and observe 21^(+13)_(-12) signal events with a statistical significance of 1.8σ. This corresponds to a branching fraction B(B^0 → γγ) = (1.7 ± 1.1(stat.) ± 0.2(syst.))× 10^(-7). Based on this result, we set a 90% confidence level upper limit of B(B^0 → γγ) < 3.2 × 10^(-7).

Additional Information

© 2011 American Physical Society. Received 11 October 2010; published 7 February 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 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 Innovación (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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