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Published January 20, 2017 | Published
Journal Article Open

Search for B^+ → K^+τ^+τ^− at the BaBar Experiment


We search for the rare flavor-changing neutral current process B^+ → K^+τ^+τ^− using data from the BABAR experiment. The data sample, collected at the center-of-mass energy of the Υ(4S) resonance, corresponds to a total integrated luminosity of 424  fb^(−1) and to 471×10^6  BB pairs. We reconstruct one B meson, produced in the Υ(4S) → B^+B^− decay, in one of many hadronic decay modes and search for activity compatible with a B^+ → K^+τ^+τ^− decay in the rest of the event. Each τ lepton is required to decay leptonically into an electron or muon and neutrinos. Comparing the expected number of background events with the data sample after applying the selection criteria, we do not find evidence for a signal. The resulting upper limit, at the 90% confidence level, is B(B^+ → K^+τ^+τ^−) < 2.25×10^(−3).

Additional Information

© 2017 American Physical Society. Received 17 June 2016; published 20 January 2017. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II2 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 (U.S,), Natural Sciences and Engineering Research Council of Canada (Canada), Commissariat à l'Énergie Atomique et aux Énergies Alternatives and Centre National de la Recherche Scientifique-IN2P3 (France), Bundesministerium für Bildung ind Forschung and Deutsche Forschungsgemeinschaft (Germany), Instituto Nazionale di Fisica Nucleare (Italy), Stichting voor Fundamenteel Onderzoek der Materie (The Netherlands), Norges forskningsråd (Norway), Ministry of education and science (Russia), Ministerio de Economía y Competitividad (Spain), and Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation (U.S.).

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Published - PhysRevLett.118.031802.pdf


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