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DOI: 10.5445/IR/1000085152
Veröffentlicht am 09.08.2018

Search for B−→μ−¯νμ Decays at the Belle Experiment

Belle Collaboration; Sibidanov, A.; Varvell, K. E.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Aushev, T.; Ayad, R.; Babu, V.; Badhrees, I.; Bahinipati, S.; Bakich, A. M.; Bansal, V.; Barberio, E.; Behera, P.; Bhuyan, B.; Biswal, J.; Bozek, A.; Bračko, M.; Browder, T. E.; ... mehr

Abstract:
We report the results of a search for the rare, purely leptonic decay B$^{-}$ → μ− ¯ν$_{μ}$ performed with a 711 fb$^{-1}$ data sample that contains 772 × 10$^{6}$ BB¯ pairs, collected near the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e$^{+}$e$^{-}$ collider. The signal events are selected based on the presence of a high momentum muon and the topology of the rest of the event showing properties of a generic B-meson decay, as well as the missing energy and momentum being consistent with the hypothesis of a neutrino from the signal decay. We find a 2.4 standard deviation excess above background including systematic uncertainties, which corresponds to a branching fraction of B(B$^{-}$ → μ$^{-}$ ¯ν$_{μ}$) = (6.46 $\pm$ 2.22 $\pm$ 1.60) × 10$^{-7}$ or a frequentist 90% confidence level interval on the B$^{-}$ → μ$^{-}$ ¯ν$_{μ}$ branching fraction of [2.9,10.7] × 10$^{-7}$.


Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114
URN: urn:nbn:de:swb:90-851527
KITopen ID: 1000085152
Erschienen in Physical review letters
Band 121
Heft 3
Seiten 031801
Vorab online veröffentlicht am 18.07.2018
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