Search for B- →μ- ν μ Decays at the Belle Experiment

The Belle Collaboration

doi:10.1103/PhysRevLett.121.031801

Search for B- →μ- ν μ Decays at the Belle Experiment

The Belle Collaboration

Department of Physics

University of Sydney
University of Victoria BC
High Energy Accelerator Research Organization, Tsukuba
The Graduate University for Advanced Studies
The University of Tokyo
University of Tabuk
King Abdulaziz University
Pacific Northwest National Laboratory
Moscow Institute of Physics and Technology
Tata Institute of Fundamental Research
King Abdulaziz City for Science and Technology
Indian Institute of Technology Bhubaneswar
University of Melbourne
Indian Institute of Technology Madras
Indian Institute of Technology Guwahati
Jožef Stefan Institute
H. Niewodniczanski Institute of Nuclear Physics
University of Maribor
University of Hawai'i at Mānoa
Charles University
National Taiwan University
Max Planck Institute for Physics (Werner Heisenberg Institute)
National Central University
Hanyang University
RAS - P.N. Lebedev Physics Institute
Moscow Engineering Physics Institute
Korea Institute of Science and Technology Information
Gyeongsang National University
Sungkyunkwan University
Wayne State University
Tohoku University
RAS - Budker Institute of Nuclear Physics
Novosibirsk State University
German Electron Synchrotron
Virginia Polytechnic Institute and State University
Karlsruhe Institute of Technology
Technical University of Munich
Indiana University Bloomington
National Institute for Nuclear Physics

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

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.

Original language	English
Article number	031801
Journal	Physical Review Letters
Volume	121
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.121.031801
State	Published - 18 Jul 2018

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10.1103/PhysRevLett.121.031801

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@article{36fcbd2c46f0442e9d6e5d2fcdd90cee,

title = "Search for B- →μ- ν μ Decays at the Belle Experiment",

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.",

author = "\{The Belle Collaboration\} and A. Sibidanov and Varvell, \{K. E.\} and I. Adachi and H. Aihara and \{Al Said\}, S. and Asner, \{D. M.\} and T. Aushev and R. Ayad and V. Babu and I. Badhrees and S. Bahinipati and Bakich, \{A. M.\} and V. Bansal and E. Barberio and P. Behera and B. Bhuyan and J. Biswal and A. Bozek and M. Bra{\v c}ko and Browder, \{T. E.\} and D. {\v C}ervenkov and P. Chang and V. Chekelian and A. Chen and Cheon, \{B. G.\} and K. Chilikin and K. Cho and Choi, \{S. K.\} and Y. Choi and D. Cinabro and T. Czank and N. Dash and \{Di Carlo\}, S. and Z. Dole{\v Z}al and Z. Dr{\'a}sal and D. Dutta and S. Eidelman and D. Epifanov and Fast, \{J. E.\} and T. Ferber and Fulsom, \{B. G.\} and V. Gaur and N. Gabyshev and A. Garmash and P. Goldenzweig and D. Greenwald and Y. Guan and E. Guido and J. Haba and Kang, \{K. H.\}",

note = "Publisher Copyright: {\textcopyright} 2018 authors. Published by the American Physical Society.",

year = "2018",

month = jul,

day = "18",

doi = "10.1103/PhysRevLett.121.031801",

language = "English",

volume = "121",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "3",

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T1 - Search for B- →μ- ν μ Decays at the Belle Experiment

AU - The Belle Collaboration

AU - Sibidanov, A.

AU - Varvell, K. E.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Badhrees, I.

AU - Bahinipati, S.

AU - Bakich, A. M.

AU - Bansal, V.

AU - Barberio, E.

AU - Behera, P.

AU - Bhuyan, B.

AU - Biswal, J.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Červenkov, D.

AU - Chang, P.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, K.

AU - Choi, S. K.

AU - Choi, Y.

AU - Cinabro, D.

AU - Czank, T.

AU - Dash, N.

AU - Di Carlo, S.

AU - DoleŽal, Z.

AU - Drásal, Z.

AU - Dutta, D.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Fast, J. E.

AU - Ferber, T.

AU - Fulsom, B. G.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Goldenzweig, P.

AU - Greenwald, D.

AU - Guan, Y.

AU - Guido, E.

AU - Haba, J.

AU - Kang, K. H.

PY - 2018/7/18

Y1 - 2018/7/18

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85050497022

U2 - 10.1103/PhysRevLett.121.031801

DO - 10.1103/PhysRevLett.121.031801

M3 - Article

C2 - 30085771

AN - SCOPUS:85050497022

SN - 0031-9007

VL - 121

JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

M1 - 031801

ER -

Search for B- →μ- ν μ Decays at the Belle Experiment

Abstract

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