Sibidanov A 1 , Varvell KE 1 , Adachi I 2 , Aihara H 3 , Al Said S 4 , Asner DM 5 Show all authors , Aushev T 6 , Ayad R 4 , Babu V 7 , Badhrees I 4 , Bahinipati S 8 , Bakich AM 1 , Bansal V 5 , Barberio E 9 , Behera P 10 , Bhuyan B 11 , Biswal J 12 , Bozek A 13 , Bračko M 12 , Browder TE 14 , Červenkov D 15 , Chang P 16 , Chekelian V 17 , Chen A 18 , Cheon BG 19 , Chilikin K 20 , Cho K 21 , Choi SK 22 , Choi Y 23 , Cinabro D 24 , Czank T 25 , Dash N 8 , Di Carlo S 24 , Doležal Z 15 , Drásal Z 15 , Dutta D 7 , Eidelman S 26 , Epifanov D 26 , Fast JE 5 , Ferber T 27 , Fulsom BG 5 , Gaur V 28 , Gabyshev N 26 , Garmash A 26 , Goldenzweig P 29 , Greenwald D 30 , Guan Y 2 , Guido E 31 , Haba J 2 , Hayasaka K 32 , Hayashii H 33 , Hedges MT 14 , Hirose S 34 , Hou WS 16 , Hsu CL 9 , Iijima T 34 , Inami K 34 , Inguglia G 27 , Ishikawa A 25 , Itoh R 2 , Iwasaki M 35 , Iwasaki Y 2 , Jacobs WW 36 , Jaegle I 37 , Jeon HB 38 , Jin Y 3 , Joo KK 39 , Julius T 9 , Kahn J 40 , Kaliyar AB 10 , Kang KH 38 , Karyan G 27 , Kawasaki T 32 , Kiesling C 17 , Kim DY 41 , Kim JB 42 , Kim SH 19 , Kim YJ 21 , Kinoshita K 43 , Kodyš P 15 , Korpar S 12 , Kotchetkov D 14 , Križan P 12 , Krokovny P 26 , Kuhr T 40 , Kulasiri R 44 , Kumar R 45 , Kuzmin A 26 , Kwon YJ 46 , Lange JS 47 , Lee IS 19 , Li CH 9 , Li L 48 , Li Gioi L 17 , Libby J 10 , Liventsev D 2 , Lubej M 12 , Luo T 49 , Masuda M 50 , Matsuda T 51 , Merola M 52 , Miyabayashi K 33 , Miyata H 32 , Mizuk R 6 , Mohanty GB 7 , Moon HK 42 , Mori T 34 , Mussa R 31 , Nakano E 35 , Nakao M 2 , Nanut T 12 , Nath KJ 11 , Natkaniec Z 13 , Nayak M 2 , Niiyama M 53 , Nisar NK 49 , Nishida S 2 , Ogawa S 54 , Okuno S 55 , Ono H 32 , Pakhlov P 20 , Pakhlova G 6 , Pal B 43 , Park CS 46 , Park CW 23 , Park H 38 , Paul S 30 , Pedlar TK 56 , Pestotnik R 12 , Piilonen LE 28 , Ritter M 40 , Rostomyan A 27 , Rozanska M 13 , Sakai Y 2 , Salehi M 40 , Sandilya S 43 , Sato Y 34 , Savinov V 49 , Schneider O 57 , Schnell G 58 , Schwanda C 59 , Seino Y 32 , Senyo K 60 , Sevior ME 9 , Shebalin V 26 , Shen CP 61 , Shibata TA 62 , Shiu JG 16 , Simon F 17 , Sokolov A 63 , Solovieva E 6 , Starič M 12 , Strube JF 5 , Stypula J 13 , Sumihama M 64 , Sumisawa K 2 , Sumiyoshi T 65 , Takizawa M 66 , Tamponi U 31 , Tanida K 67 , Tenchini F 9 , Trabelsi K 2 , Uchida M 62 , Uehara S 2 , Uglov T 6 , Unno Y 19 , Uno S 2 , Urquijo P 9 , Van Hulse C 58 , Varner G 14 , Vorobyev V 26 , Wang CH 68 , Wang MZ 16 , Wang P 69 , Watanabe M 32 , Watanuki S 25 , Widmann E 70 , Won E 42 , Yamashita Y 71 , Ye H 27 , Yelton J 37 , Yuan CZ 69 , Yusa Y 32 , Zhang ZP 48 , Zhilich V 26 , Zhukova V 20 , Zhulanov V 26 , Zupanc A 12 , Belle Collaboration

Affiliations 

  • 1 School of Physics, University of Sydney, New South Wales 2006
  • 2 High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
  • 3 Department of Physics, University of Tokyo, Tokyo 113-0033
  • 4 Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
  • 5 Pacific Northwest National Laboratory, Richland, Washington 99352
  • 6 Moscow Institute of Physics and Technology, Moscow Region 141700
  • 7 Tata Institute of Fundamental Research, Mumbai 400005
  • 8 Indian Institute of Technology Bhubaneswar, Satya Nagar 751007
  • 9 School of Physics, University of Melbourne, Victoria 3010
  • 10 Indian Institute of Technology Madras, Chennai 600036
  • 11 Indian Institute of Technology Guwahati, Assam 781039
  • 12 J. Stefan Institute, 1000 Ljubljana
  • 13 H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
  • 14 University of Hawaii, Honolulu, Hawaii 96822
  • 15 Faculty of Mathematics and Physics, Charles University, 121 16 Prague
  • 16 Department of Physics, National Taiwan University, Taipei 10617
  • 17 Max-Planck-Institut für Physik, 80805 München
  • 18 National Central University, Chung-li 32054
  • 19 Hanyang University, Seoul 133-791
  • 20 P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
  • 21 Korea Institute of Science and Technology Information, Daejeon 305-806
  • 22 Gyeongsang National University, Chinju 660-701
  • 23 Sungkyunkwan University, Suwon 440-746
  • 24 Wayne State University, Detroit, Michigan 48202
  • 25 Department of Physics, Tohoku University, Sendai 980-8578
  • 26 Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
  • 27 Deutsches Elektronen-Synchrotron, 22607 Hamburg
  • 28 Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
  • 29 Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
  • 30 Department of Physics, Technische Universität München, 85748 Garching
  • 31 INFN-Sezione di Torino, 10125 Torino
  • 32 Niigata University, Niigata 950-2181
  • 33 Nara Women's University, Nara 630-8506
  • 34 Graduate School of Science, Nagoya University, Nagoya 464-8602
  • 35 Osaka City University, Osaka 558-8585
  • 36 Indiana University, Bloomington, Indiana 47408
  • 37 University of Florida, Gainesville, Florida 32611
  • 38 Kyungpook National University, Daegu 702-701
  • 39 Chonnam National University, Kwangju 660-701
  • 40 Ludwig Maximilians University, 80539 Munich
  • 41 Soongsil University, Seoul 156-743
  • 42 Korea University, Seoul 136-713
  • 43 University of Cincinnati, Cincinnati, Ohio 45221
  • 44 Kennesaw State University, Kennesaw, Georgia 30144
  • 45 Punjab Agricultural University, Ludhiana 141004
  • 46 Yonsei University, Seoul 120-749
  • 47 Justus-Liebig-Universität Gießen, 35392 Gießen
  • 48 University of Science and Technology of China, Hefei 230026
  • 49 University of Pittsburgh, Pittsburgh, Pennsylvania 15260
  • 50 Earthquake Research Institute, University of Tokyo, Tokyo 113-0032
  • 51 University of Miyazaki, Miyazaki 889-2192
  • 52 INFN-Sezione di Napoli, 80126 Napoli
  • 53 Kyoto University, Kyoto 606-8502
  • 54 Toho University, Funabashi 274-8510
  • 55 Kanagawa University, Yokohama 221-8686
  • 56 Luther College, Decorah, Iowa 52101
  • 57 École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015
  • 58 University of the Basque Country UPV/EHU, 48080 Bilbao
  • 59 Institute of High Energy Physics, Vienna 1050
  • 60 Yamagata University, Yamagata 990-8560
  • 61 Beihang University, Beijing 100191
  • 62 Tokyo Institute of Technology, Tokyo 152-8550
  • 63 Institute for High Energy Physics, Protvino 142281
  • 64 Gifu University, Gifu 501-1193
  • 65 Tokyo Metropolitan University, Tokyo 192-0397
  • 66 Showa Pharmaceutical University, Tokyo 194-8543
  • 67 Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195
  • 68 National United University, Miao Li 36003
  • 69 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
  • 70 Stefan Meyer Institute for Subatomic Physics, Vienna 1090
  • 71 Nippon Dental University, Niigata 951-8580
Phys. Rev. Lett., 2018 Jul 20;121(3):031801.
PMID: 30085771 DOI: 10.1103/PhysRevLett.121.031801

Abstract

We report the results of a search for the rare, purely leptonic decay B^{-}→μ^{-}ν[over ¯]_{μ} performed with a 711  fb^{-1} data sample that contains 772×10^{6}  BB[over ¯] 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[over ¯]_{μ})=(6.46±2.22±1.60)×10^{-7} or a frequentist 90% confidence level interval on the B^{-}→μ^{-}ν[over ¯]_{μ} branching fraction of [2.9,10.7]×10^{-7}.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.