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Published December 1, 2019 | Submitted + Published
Journal Article Open

Search for B⁻ → Λpνν with the BABAR experiment


A search for the rare flavor-changing neutral current process B⁻→Λpνν using data from the BABAR experiment has been performed. A total of 424  fb⁻¹ of e^+e^− collision data collected at the center-of-mass energy of the Υ(4S) resonance is used in this study, corresponding to a sample of (471±3)×10⁶ BB̅ pairs. Signal B⁻→Λpνν candidates are identified by first fully reconstructing a B⁺ decay in one of many possible exclusive decays to hadronic final states, then examining detector activity that is not associated with this reconstructed B⁺ decay for evidence of a signal B⁻→Λpνν decay. The data yield is found to be consistent with the expected background contribution under a null signal hypothesis, resulting in an upper limit of B(B⁻→Λpνν) < 3.0×10⁻⁵ at the 90% confidence level.

Additional Information

© 2019 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3. Received 22 August 2019; published 6 December 2019. We gratefully acknowledge David M. Straub's help in determining the new physics implications of this analysis. 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 (Netherlands), NFR (Norway), MES (Russia), MICIIN (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union), the A. P. Sloan Foundation (USA), and the Binational Science Foundation (USA-Israel).

Attached Files

Published - PhysRevD.100.111101.pdf

Submitted - 1908.07425.pdf


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