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Observation of ϒ(2S)→γη_{b}(1S) Decay.
Fulsom, B G; Pedlar, T K; Adachi, I; Aihara, H; Al Said, S; Asner, D M; Atmacan, H; Aulchenko, V; Aushev, T; Ayad, R; Babu, V; Badhrees, I; Bakich, A M; Bansal, V; Behera, P; Beleño, C; Berger, M; Bhardwaj, V; Bhuyan, B; Bilka, T; Biswal, J; Bondar, A; Bonvicini, G; Bozek, A; Bracko, M; Browder, T E; Cao, L; Cervenkov, D; Chekelian, V; Chen, A; Cheon, B G; Chilikin, K; Cho, K; Choi, S-K; Choi, Y; Choudhury, S; Cinabro, D; Cunliffe, S; Dash, N; Di Carlo, S; Dingfelder, J; Dolezal, Z; Dong, T V; Drásal, Z; Eidelman, S; Epifanov, D; Fast, J E; Ferber, T; Garg, R; Gaur, V.
Afiliação
  • Fulsom BG; Pacific Northwest National Laboratory, Richland, Washington 99352.
  • Pedlar TK; Luther College, Decorah, Iowa 52101.
  • Adachi I; SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193.
  • Aihara H; High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
  • Al Said S; Department of Physics, University of Tokyo, Tokyo 113-0033.
  • Asner DM; Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589.
  • Atmacan H; Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
  • Aulchenko V; Brookhaven National Laboratory, Upton, New York 11973.
  • Aushev T; University of South Carolina, Columbia, South Carolina 29208.
  • Ayad R; Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
  • Babu V; Novosibirsk State University, Novosibirsk 630090.
  • Badhrees I; Moscow Institute of Physics and Technology, Moscow Region 141700.
  • Bakich AM; Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
  • Bansal V; Tata Institute of Fundamental Research, Mumbai 400005.
  • Behera P; King Abdulaziz City for Science and Technology, Riyadh 11442.
  • Beleño C; Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
  • Berger M; School of Physics, University of Sydney, New South Wales 2006.
  • Bhardwaj V; Pacific Northwest National Laboratory, Richland, Washington 99352.
  • Bhuyan B; Indian Institute of Technology Madras, Chennai 600036.
  • Bilka T; II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen.
  • Biswal J; Stefan Meyer Institute for Subatomic Physics, Vienna 1090.
  • Bondar A; Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306.
  • Bonvicini G; Indian Institute of Technology Guwahati, Assam 781039.
  • Bozek A; Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
  • Bracko M; J. Stefan Institute, 1000 Ljubljana.
  • Browder TE; Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
  • Cao L; Novosibirsk State University, Novosibirsk 630090.
  • Cervenkov D; Wayne State University, Detroit, Michigan 48202.
  • Chekelian V; H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342.
  • Chen A; J. Stefan Institute, 1000 Ljubljana.
  • Cheon BG; University of Maribor, 2000 Maribor.
  • Chilikin K; University of Hawaii, Honolulu, Hawaii 96822.
  • Cho K; Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe.
  • Choi SK; Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
  • Choi Y; Max-Planck-Institut für Physik, 80805 München.
  • Choudhury S; National Central University, Chung-li 32054.
  • Cinabro D; Hanyang University, Seoul 133-791.
  • Cunliffe S; P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991.
  • Dash N; Korea Institute of Science and Technology Information, Daejeon 305-806.
  • Di Carlo S; Gyeongsang National University, Chinju 660-701.
  • Dingfelder J; Sungkyunkwan University, Suwon 440-746.
  • Dolezal Z; Indian Institute of Technology Hyderabad, Telangana 502285.
  • Dong TV; Wayne State University, Detroit, Michigan 48202.
  • Drásal Z; Deutsches Elektronen-Synchrotron, 22607 Hamburg.
  • Eidelman S; Indian Institute of Technology Bhubaneswar, Satya Nagar 751007.
  • Epifanov D; LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay F-91898.
  • Fast JE; University of Bonn, 53115 Bonn.
  • Ferber T; Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
  • Garg R; SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193.
  • Gaur V; High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
Phys Rev Lett ; 121(23): 232001, 2018 Dec 07.
Article em En | MEDLINE | ID: mdl-30576207
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.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article