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Published September 1, 2012 | Published
Journal Article Open

Improved limits on B^0 decays to invisible (+γ) final states


We establish improved upper limits on branching fractions for B^0 decays to final states where the decay products are purely invisible (i.e., no observable final state particles) and for final states where the only visible product is a photon. Within the Standard Model, these decays have branching fractions that are below the current experimental sensitivity, but various models of physics beyond the Standard Model predict significant contributions for these channels. Using 471×10^6 BB pairs collected at the Υ(4S) resonance by the BABAR experiment at the PEP-II e^+e^- storage ring at the SLAC National Accelerator Laboratory, we establish upper limits at the 90% confidence level of 2.4×10^(-5) for the branching fraction of B^0 → invisible and 1.7×10^(-5) for the branching fraction of B^0 → invisible + γ.

Additional Information

© 2012 American Physical Society. Received 13 June 2012; published 27 September 2012. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MICIIN (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation (USA).

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Published - PhysRevD.86.051105.pdf


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