Observation of ϒ(2S)→γη_{b}(1S) Decay

Fulsom BG 1 , Pedlar TK 2 , Adachi I 3 , Aihara H 4 , Al Said S 5 , Asner DM 6 Show all authors , Atmacan H 7 , Aulchenko V 8 , Aushev T 9 , Ayad R 10 , Babu V 11 , Badhrees I 12 , Bakich AM 13 , Bansal V 1 , Behera P 14 , Beleño C 15 , Berger M 16 , Bhardwaj V 17 , Bhuyan B 18 , Bilka T 19 , Biswal J 20 , Bondar A 8 , Bonvicini G 21 , Bozek A 22 , Bračko M 20 , Browder TE 23 , Cao L 24 , Červenkov D 19 , Chekelian V 25 , Chen A 26 , Cheon BG 27 , Chilikin K 28 , Cho K 29 , Choi SK 30 , Choi Y 31 , Choudhury S 32 , Cinabro D 21 , Cunliffe S 33 , Dash N 34 , Di Carlo S 35 , Dingfelder J 36 , Doležal Z 19 , Dong TV 3 , Drásal Z 19 , Eidelman S 8 , Epifanov D 8 , Fast JE 1 , Ferber T 33 , Garg R 37 , Gaur V 38 , Gabyshev N 8 , Garmash A 8 , Gelb M 24 , Giri A 32 , Goldenzweig P 24 , Guido E 39 , Haba J 3 , Hayasaka K 40 , Hayashii H 41 , Hirose S 42 , Hou WS 43 , Iijima T 42 , Inami K 42 , Inguglia G 33 , Ishikawa A 44 , Itoh R 3 , Iwasaki M 45 , Iwasaki Y 46 , Jacobs WW 47 , Jeon HB 48 , Jia S 49 , Jin Y 4 , Joffe D 50 , Joo KK 51 , Julius T 52 , Kawasaki T 40 , Kichimi H 46 , Kiesling C 25 , Kim DY 53 , Kim HJ 48 , Kim JB 54 , Kim KT 54 , Kim SH 27 , Kinoshita K 55 , Kodyš P 19 , Korpar S 20 , Kotchetkov D 23 , Križan P 20 , Kroeger R 56 , Krokovny P 8 , Kuhr T 57 , Kulasiri R 50 , Kuzmin A 8 , Kwon YJ 58 , Lange JS 59 , Lee IS 27 , Lee SC 48 , Li LK 60 , Li YB 61 , Li Gioi L 25 , Libby J 14 , Liventsev D 46 , Lubej M 20 , Luo T 62 , Masuda M 63 , Matsuda T 64 , Matvienko D 8 , Merola M 65 , Miyabayashi K 41 , Miyata H 40 , Mizuk R 28 , Mohanty GB 11 , Moon HK 54 , Mori T 42 , Mussa R 39 , Nakao M 3 , Nanut T 20 , Nath KJ 18 , Natkaniec Z 22 , Nayak M 46 , Niiyama M 66 , Nisar NK 67 , Nishida S 3 , Ogawa S 68 , Okuno S 69 , Ono H 70 , Pakhlov P 28 , Pakhlova G 28 , Pal B 6 , Pardi S 65 , Park H 48 , Paul S 71 , Pestotnik R 20 , Piilonen LE 38 , Popov V 28 , Prencipe E 72 , Rabusov A 71 , Ritter M 57 , Rostomyan A 33 , Russo G 65 , Sakai Y 3 , Salehi M 57 , Sandilya S 55 , Santelj L 46 , Sanuki T 44 , Savinov V 67 , Schneider O 73 , Schnell G 74 , Schwanda C 75 , Seino Y 40 , Senyo K 76 , Sevior ME 52 , Shebalin V 8 , Shen CP 49 , Shibata TA 77 , Shiu JG 43 , Shwartz B 8 , Simon F 25 , Singh JB 37 , Sokolov A 78 , Solovieva E 28 , Starič M 20 , Strube JF 1 , Sumihama M 79 , Sumisawa K 3 , Sumiyoshi T 80 , Sutcliffe W 24 , Takizawa M 81 , Tamponi U 39 , Tanida K 82 , Tenchini F 52 , Uchida M 77 , Uglov T 28 , Unno Y 27 , Uno S 3 , Urquijo P 52 , Vahsen SE 23 , Van Hulse C 74 , Van Tonder R 24 , Varner G 23 , Vinokurova A 8 , Vorobyev V 8 , Vossen A 83 , Wang B 55 , Wang CH 84 , Wang P 60 , Wang XL 62 , Watanabe M 40 , Watanuki S 44 , Widmann E 16 , Won E 54 , Ye H 33 , Yin JH 60 , Yuan CZ 60 , Zhang ZP 85 , Zhilich V 8 , Zhukova V 28 , Zhulanov V 8 , Zupanc A 20 , Belle Collaboration

Affiliations 

  • 1 Pacific Northwest National Laboratory, Richland, Washington 99352
  • 2 Luther College, Decorah, Iowa 52101
  • 3 SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
  • 4 Department of Physics, University of Tokyo, Tokyo 113-0033
  • 5 Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589
  • 6 Brookhaven National Laboratory, Upton, New York 11973
  • 7 University of South Carolina, Columbia, South Carolina 29208
  • 8 Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
  • 9 Moscow Institute of Physics and Technology, Moscow Region 141700
  • 10 Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
  • 11 Tata Institute of Fundamental Research, Mumbai 400005
  • 12 King Abdulaziz City for Science and Technology, Riyadh 11442
  • 13 School of Physics, University of Sydney, New South Wales 2006
  • 14 Indian Institute of Technology Madras, Chennai 600036
  • 15 II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen
  • 16 Stefan Meyer Institute for Subatomic Physics, Vienna 1090
  • 17 Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306
  • 18 Indian Institute of Technology Guwahati, Assam 781039
  • 19 Faculty of Mathematics and Physics, Charles University, 121 16 Prague
  • 20 J. Stefan Institute, 1000 Ljubljana
  • 21 Wayne State University, Detroit, Michigan 48202
  • 22 H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
  • 23 University of Hawaii, Honolulu, Hawaii 96822
  • 24 Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
  • 25 Max-Planck-Institut für Physik, 80805 München
  • 26 National Central University, Chung-li 32054
  • 27 Hanyang University, Seoul 133-791
  • 28 P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
  • 29 Korea Institute of Science and Technology Information, Daejeon 305-806
  • 30 Gyeongsang National University, Chinju 660-701
  • 31 Sungkyunkwan University, Suwon 440-746
  • 32 Indian Institute of Technology Hyderabad, Telangana 502285
  • 33 Deutsches Elektronen-Synchrotron, 22607 Hamburg
  • 34 Indian Institute of Technology Bhubaneswar, Satya Nagar 751007
  • 35 LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay F-91898
  • 36 University of Bonn, 53115 Bonn
  • 37 Panjab University, Chandigarh 160014
  • 38 Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
  • 39 INFN-Sezione di Torino, 10125 Torino
  • 40 Niigata University, Niigata 950-2181
  • 41 Nara Women's University, Nara 630-8506
  • 42 Graduate School of Science, Nagoya University, Nagoya 464-8602
  • 43 Department of Physics, National Taiwan University, Taipei 10617
  • 44 Department of Physics, Tohoku University, Sendai 980-8578
  • 45 Osaka City University, Osaka 558-8585
  • 46 High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
  • 47 Indiana University, Bloomington, Indiana 47408
  • 48 Kyungpook National University, Daegu 702-701
  • 49 Beihang University, Beijing 100191
  • 50 Kennesaw State University, Kennesaw, Georgia 30144
  • 51 Chonnam National University, Kwangju 660-701
  • 52 School of Physics, University of Melbourne, Victoria 3010
  • 53 Soongsil University, Seoul 156-743
  • 54 Korea University, Seoul 136-713
  • 55 University of Cincinnati, Cincinnati, Ohio 45221
  • 56 University of Mississippi, University, Mississippi 38677
  • 57 Ludwig Maximilians University, 80539 Munich
  • 58 Yonsei University, Seoul 120-749
  • 59 Justus-Liebig-Universität Gießen, 35392 Gießen
  • 60 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
  • 61 Peking University, Beijing 100871
  • 62 Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
  • 63 Earthquake Research Institute, University of Tokyo, Tokyo 113-0032
  • 64 University of Miyazaki, Miyazaki 889-2192
  • 65 INFN-Sezione di Napoli, 80126 Napoli
  • 66 Kyoto University, Kyoto 606-8502
  • 67 University of Pittsburgh, Pittsburgh, Pennsylvania 15260
  • 68 Toho University, Funabashi 274-8510
  • 69 Kanagawa University, Yokohama 221-8686
  • 70 Nippon Dental University, Niigata 951-8580
  • 71 Department of Physics, Technische Universität München, 85748 Garching
  • 72 Forschungszentrum Jülich, 52425 Jülich
  • 73 École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015
  • 74 University of the Basque Country UPV/EHU, 48080 Bilbao
  • 75 Institute of High Energy Physics, Vienna 1050
  • 76 Yamagata University, Yamagata 990-8560
  • 77 Tokyo Institute of Technology, Tokyo 152-8550
  • 78 Institute for High Energy Physics, Protvino 142281
  • 79 Gifu University, Gifu 501-1193
  • 80 Tokyo Metropolitan University, Tokyo 192-0397
  • 81 J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
  • 82 Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195
  • 83 Duke University, Durham, North Carolina 27708
  • 84 National United University, Miao Li 36003
  • 85 University of Science and Technology of China, Hefei 230026
Phys Rev Lett, 2018 Dec 07;121(23):232001.
PMID: 30576207 DOI: 10.1103/PhysRevLett.121.232001

Abstract

We report the observation of ϒ(2S)→γη_{b}(1S) decay based on an analysis of the inclusive photon spectrum of 24.7  fb^{-1} of e^{+}e^{-} collisions at the ϒ(2S) center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We measure a branching fraction of B[ϒ(2S)→γη_{b}(1S)]=(6.1_{-0.7-0.6}^{+0.6+0.9})×10^{-4} and derive an η_{b}(1S) mass of 9394.8_{-3.1-2.7}^{+2.7+4.5}  MeV/c^{2}, where the uncertainties are statistical and systematic, respectively. The significance of our measurement is greater than 7 standard deviations, constituting the first observation of this decay mode.

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

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