Search for B- →μ- ν μ Decays at the Belle Experiment
Journal
Physical Review Letters
Journal Volume
121
Journal Issue
3
Date Issued
2018
Author(s)
Sibidanov A. et al.
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.
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 772×106 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. ? 2018 authors. Published by the American Physical Society.
Subjects
Atomic physics; Asymmetric energy; Belle detectors; Belle experiments; Branching fractions; Confidence levels; Rest of the events; Standard deviation; Systematic uncertainties; Physics; article; meson; neutrino; uncertainty
SDGs
Type
journal article