First Observation of the Hadronic Transition ϒ(4S)→ηhb(1P) and New Measurement of the hb(1P) and ηb(1S) Parameters

作     者：U. Tamponi R. Mussa A. Abdesselam H. Aihara K. Arinstein D. M. Asner H. Atmacan T. Aushev R. Ayad I. Badhrees A. M. Bakich E. Barberio V. Bhardwaj B. Bhuyan J. Biswal A. Bondar G. Bonvicini A. Bozek M. Bračko T. E. Browder D. Červenkov A. Chen B. G. Cheon K. Cho V. Chobanova S.-K. Choi Y. Choi D. Cinabro M. Danilov Z. Doležal Z. Drásal A. Drutskoy S. Eidelman D. Epifanov H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash D. Getzkow R. Gillard Y. M. Goh B. Golob J. Haba K. Hayasaka H. Hayashii X. H. He M. T. Hedges W.-S. Hou T. Iijima K. Inami A. Ishikawa I. Jaegle D. Joffe T. Julius E. Kato P. Katrenko H. Kichimi C. Kiesling D. Y. Kim H. J. Kim J. H. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar P. Križan P. Krokovny T. Kumita A. Kuzmin J. S. Lange P. Lewis J. Libby P. Lukin D. Matvienko K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty A. Moll T. Mori E. Nakano M. Nakao T. Nanut Z. Natkaniec M. Nayak N. K. Nisar S. Nishida S. Ogawa S. Okuno S. L. Olsen W. Ostrowicz C. Oswald G. Pakhlova B. Pal H. Park T. K. Pedlar L. Pesántez R. Pestotnik M. Petrič L. E. Piilonen E. Ribežl M. Ritter A. Rostomyan S. Ryu Y. Sakai S. Sandilya L. Santelj T. Sanuki Y. Sato V. Savinov O. Schneider G. Schnell C. Schwanda D. Semmler K. Senyo M. E. Sevior M. Shapkin V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz A. Sibidanov F. Simon Y.-S. Sohn A. Sokolov M. Starič M. Steder J. Stypula K. Tanida Y. Teramoto K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo C. Van Hulse P. Vanhoefer G. Varner A. Vinokurova A. Vossen M. N. Wagner M.-Z. Wang X. L. Wang Y. Watanabe K. M. Williams E. Won J. Yamaoka S. Yashchenko Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc 

作者机构：INFN—Sezione di Torino 10125 Torino University of Torino 10124 Torino Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics University of Tokyo Tokyo 113-0033 Budker Institute of Nuclear Physics SB RAS and Novosibirsk State University Novosibirsk 630090 Pacific Northwest National Laboratory Richland Washington 99352 Middle East Technical University 06531 Ankara Moscow Institute of Physics and Technology Moscow Region 141700 Institute for Theoretical and Experimental Physics Moscow 117218 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 School of Physics University of Melbourne Victoria 3010 University of South Carolina Columbia South Carolina 29208 Indian Institute of Technology Guwahati Assam 781039 J. Stefan Institute 1000 Ljubljana Wayne State University Detroit Michigan 48202 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 Faculty of Mathematics and Physics Charles University 121 16 Prague National Central University Chung-li 32054 Hanyang University Seoul 133-791 Korea Institute of Science and Technology Information Daejeon 305-806 Max-Planck-Institut für Physik 80805 München Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Moscow Physical Engineering Institute Moscow 115409 Deutsches Elektronen–Synchrotron 22607 Hamburg Tata Institute of Fundamental Research Mumbai 400005 Justus-Liebig-Universität Gießen 35392 Gießen Faculty of Mathematics and Physics University of Ljubljana 1000 Ljubljana High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Kobayashi-Maskawa Institute Nagoya University Nagoya 464-8602 Nara Women’s University Nara 630-8506 Peking University Beijing 100871 Department of Physics National Taiwan University Taipei 10617 Graduate School of Science Nagoya University Nagoya 464-8602 Tohoku University Sendai 980-8578 Kennesaw State University Kennesaw Georgia 30144 Soongsil University Seoul 156-743 Kyungpook National University Daegu 702-701 Korea University Seoul 136-713 University of Cincinnati Cincinnati Ohio 45221 Tokyo Metropolitan University Tokyo 192-0397 Indian Institute of Technology Madras Chennai 600036 Niigata University Niigata 950-2181 Excellence Cluster Universe Technische Universität München 85748 Garching Osaka City University Osaka 558-8585 Toho University Funabashi 274-8510 Kanagawa University Yokohama 221-8686 Seoul National University Seoul 151-742 University of Bonn 53115 Bonn Luther College Decorah Iowa 52101 CNP Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 University of Pittsburgh Pittsburgh Pennsylvania 15260 École Polytechnique Fédérale de Lausanne (EPFL) Lausanne 1015 University of the Basque Country UPV/EHU 48080 Bilbao IKERBASQUE Basque Foundation for Science 48013 Bilbao Institute of High Energy Physics Vienna 1050 Yamagata University Yamagata 990-8560 Institute for High Energy Physics Protvino 142281 Beihang University Beijing 100191 Tokyo Institute of Technology Tokyo 152-8550 Yonsei University Seoul 120-749 Indiana University Bloomington Indiana 47408 University of Science and Technology of China Hefei 230026 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2015年第115卷第14期

页      面：142001-142001页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：National Science Foundation  NSF 

主　　题：Heavy quark effective theory Quarkonia Lepton colliders 

摘      要：Using a sample of 771.6×106 ϒϒ(4S) decays collected by the Belle experiment at the KEKB e+e− collider, we observe, for the first time, the transition ϒ(4S)→ηhb(1P) with the branching fraction B[ϒ(4S)→ηhb(1P)]=(2.18±0.11±0.18)×10−3 and we measure the hb(1P) mass Mhb(1P)=(9899.3±0.4±1.0) MeV/c2, corresponding to the hyperfine (HF) splitting ΔMHF(1P)=(0.6±0.4±1.0) MeV/c2. Using the transition hb(1P)→γηb(1S), we measure the ηb(1S) mass Mηb(1S)=(9400.7±1.7±1.6) MeV/c2, corresponding to ΔMHF(1S)=(59.6±1.7±1.6) MeV/c2, the ηb(1S) width Γηb(1S)=(8−5+6±5) MeV/c2 and the branching fraction B[hb(1P)→γηb(1S)]=(56±8±4)%.