|Title:||Search for B- →μ- ν μ Decays at the Belle Experiment||Authors:||Kim, S. H.
Al Said, S.
Kaliyar, A. B.
Browder, T. E.
Hou, W. S.
Kim, J. B.
Hedges, M. T.
Kim, D. Y.
Di Carlo, S.
Jeon, H. B.
PAO-TI CHANG et al.
|Issue Date:||18-Jul-2018||Journal Volume:||121||Journal Issue:||3||Source:||Physical Review Letters||Abstract:||
© 2018 authors. Published by the American Physical Society. 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 772×106 BB pairs, collected near the (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-νμ)=(6.46±2.22±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.
|Appears in Collections:||物理學系|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.