Search for B- -˃ mu(-)(nu)over-bar(mu) Decays at the Belle Experiment
- Title
- Search for B- -˃ mu(-)(nu)over-bar(mu) Decays at the Belle Experiment
- Author
- 천병구
- Keywords
- MONTE-CARLO; IDENTIFICATION; KEKB
- Issue Date
- 2018-07
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v. 121, no. 3, Article no. 031801
- Abstract
- We report the results of a search for the rare, purely leptonic decay B- -> mu(-)(nu) over bar (mu) performed with a 711 fb(-1) data sample that contains 772 x 10(6) B (B) over bar pairs, collected near the Upsilon(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- -> mu(-)(nu) over bar (mu)) = (6.46 +/- 2.22 +/- 1.60) x 10(-7) or a frequentist 90% confidence level interval on the B- -> mu(-)(nu) over bar (mu) branching fraction of [2.9, 10.7] x 10(-7).
- URI
- https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.031801https://repository.hanyang.ac.kr/handle/20.500.11754/119336
- ISSN
- 0031-9007; 1079-7114
- DOI
- 10.1103/PhysRevLett.121.031801
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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