Observation of ϒ(2S)γηb(1S) Decay

Fulsom, B. G. (Pacific Northwest National Laboratory, Richland, Washington 99352) ; Pedlar, T. K. (Luther College, Decorah, Iowa 52101) ; Adachi, I. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Aihara, H. (Department of Physics, University of Tokyo, Tokyo 113-0033) ; Al Said, S. (Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451) (Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589) ; Asner, D. M. (Brookhaven National Laboratory, Upton, New York 11973) ; Atmacan, H. (University of South Carolina, Columbia, South Carolina 29208) ; Aulchenko, V. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Aushev, T. (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Ayad, R. (Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451) ; Babu, V. (Tata Institute of Fundamental Research, Mumbai 400005) ; Badhrees, I. (Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451) (King Abdulaziz City for Science and Technology, Riyadh 11442) ; Bakich, A. M. (School of Physics, University of Sydney, New South Wales 2006) ; Bansal, V. (Pacific Northwest National Laboratory, Richland, Washington 99352) ; Behera, P. (Indian Institute of Technology Madras, Chennai 600036) ; Beleño, C. (II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen) ; Berger, M. (Stefan Meyer Institute for Subatomic Physics, Vienna 1090) ; Bhardwaj, V. (Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306) ; Bhuyan, B. (Indian Institute of Technology Guwahati, Assam 781039) ; Bilka, T. (Faculty of Mathematics and Physics, Charles University, 121 16 Prague) ; Biswal, J. (J. Stefan Institute, 1000 Ljubljana) ; Bondar, A. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Bonvicini, G. (Wayne State University, Detroit, Michigan 48202) ; Bozek, A. (H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342) ; Bračko, M. (University of Maribor, 2000 Maribor) (J. Stefan Institute, 1000 Ljubljana) ; Browder, T. E. (University of Hawaii, Honolulu, Hawaii 96822) ; Cao, L. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Červenkov, D. (Faculty of Mathematics and Physics, Charles University, 121 16 Prague) ; Chekelian, V. (Max-Planck-Institut für Physik, 80805 München) ; Chen, A. (National Central University, Chung-li 32054) ; Cheon, B. G. (Hanyang University, Seoul 133-791) ; Chilikin, K. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) ; Cho, K. (Korea Institute of Science and Technology Information, Daejeon 305-806) ; Choi, S.K. (Gyeongsang National University, Chinju 660-701) ; Choi, Y. (Sungkyunkwan University, Suwon 440-746) ; Choudhury, S. (Indian Institute of Technology Hyderabad, Telangana 502285) ; Cinabro, D. (Wayne State University, Detroit, Michigan 48202) ; Cunliffe, S. (Deutsches Elektronen-Synchrotron, 22607 Hamburg) ; Dash, N. (Indian Institute of Technology Bhubaneswar, Satya Nagar 751007) ; Di Carlo, S. (LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay F-91898) ; Dingfelder, J. (University of Bonn, 53115 Bonn) ; Doležal, Z. (Faculty of Mathematics and Physics, Charles University, 121 16 Prague) ; Dong, T. V. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Drásal, Z. (Faculty of Mathematics and Physics, Charles University, 121 16 Prague) ; Eidelman, S. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) ; Epifanov, D. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Fast, J. E. (Pacific Northwest National Laboratory, Richland, Washington 99352) ; Ferber, T. (Deutsches Elektronen-Synchrotron, 22607 Hamburg) ; Garg, R. (Panjab University, Chandigarh 160014) ; Gaur, V. (Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061) ; Gabyshev, N. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Garmash, A. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Gelb, M. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Giri, A. (Indian Institute of Technology Hyderabad, Telangana 502285) ; Goldenzweig, P. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Guido, E. (INFN—Sezione di Torino, 10125 Torino) ; Haba, J. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Hayasaka, K. (Niigata University, Niigata 950-2181) ; Hayashii, H. (Nara Women’s University, Nara 630-8506) ; Hirose, S. (Graduate School of Science, Nagoya University, Nagoya 464-8602) ; Hou, W.S. (Department of Physics, National Taiwan University, Taipei 10617) ; Iijima, T. (Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602) (Graduate School of Science, Nagoya University, Nagoya 464-8602) ; Inami, K. (Graduate School of Science, Nagoya University, Nagoya 464-8602) ; Inguglia, G. (Deutsches Elektronen-Synchrotron, 22607 Hamburg) ; Ishikawa, A. (Department of Physics, Tohoku University, Sendai 980-8578) ; Itoh, R. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Iwasaki, M. (Osaka City University, Osaka 558-8585) ; Iwasaki, Y. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) ; Jacobs, W. W. (Indiana University, Bloomington, Indiana 47408) ; Jeon, H. B. (Kyungpook National University, Daegu 702-701) ; Jia, S. (Beihang University, Beijing 100191) ; Jin, Y. (Department of Physics, University of Tokyo, Tokyo 113-0033) ; Joffe, D. (Kennesaw State University, Kennesaw, Georgia 30144) ; Joo, K. K. (Chonnam National University, Kwangju 660-701) ; Julius, T. (School of Physics, University of Melbourne, Victoria 3010) ; Kawasaki, T. (Niigata University, Niigata 950-2181) ; Kichimi, H. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) ; Kiesling, C. (Max-Planck-Institut für Physik, 80805 München) ; Kim, D. Y. (Soongsil University, Seoul 156-743) ; Kim, H. J. (Kyungpook National University, Daegu 702-701) ; Kim, J. B. (Korea University, Seoul 136-713) ; Kim, K. T. (Korea University, Seoul 136-713) ; Kim, S. H. (Hanyang University, Seoul 133-791) ; Kinoshita, K. (University of Cincinnati, Cincinnati, Ohio 45221) ; Kodyš, P. (Faculty of Mathematics and Physics, Charles University, 121 16 Prague) ; Korpar, S. (University of Maribor, 2000 Maribor) (J. Stefan Institute, 1000 Ljubljana) ; Kotchetkov, D. (University of Hawaii, Honolulu, Hawaii 96822) ; Križan, P. (Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana) (J. Stefan Institute, 1000 Ljubljana) ; Kroeger, R. (University of Mississippi, University, Mississippi 38677) ; Krokovny, P. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Kuhr, T. (Ludwig Maximilians University, 80539 Munich) ; Kulasiri, R. (Kennesaw State University, Kennesaw, Georgia 30144) ; Kuzmin, A. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Kwon, Y.J. (Yonsei University, Seoul 120-749) ; Lange, J. S. (Justus-Liebig-Universität Gießen, 35392 Gießen) ; Lee, I. S. (Hanyang University, Seoul 133-791) ; Lee, S. C. (Kyungpook National University, Daegu 702-701) ; Li, L. K. (Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049) ; Li, Y. B. (Peking University, Beijing 100871) ; Li Gioi, L. (Max-Planck-Institut für Physik, 80805 München) ; Libby, J. (Indian Institute of Technology Madras, Chennai 600036) ; Liventsev, D. (Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061) (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) ; Lubej, M. (J. Stefan Institute, 1000 Ljubljana) ; Luo, T. (Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443) ; Masuda, M. (Earthquake Research Institute, University of Tokyo, Tokyo 113-0032) ; Matsuda, T. (University of Miyazaki, Miyazaki 889-2192) ; Matvienko, D. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) ; Merola, M. (INFN—Sezione di Napoli, 80126 Napoli) (Università di Napoli Federico II, 80055 Napoli) ; Miyabayashi, K. (Nara Women’s University, Nara 630-8506) ; Miyata, H. (Niigata University, Niigata 950-2181) ; Mizuk, R. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Physical Engineering Institute, Moscow 115409) (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Mohanty, G. B. (Tata Institute of Fundamental Research, Mumbai 400005) ; Moon, H. K. (Korea University, Seoul 136-713) ; Mori, T. (Graduate School of Science, Nagoya University, Nagoya 464-8602) ; Mussa, R. (INFN—Sezione di Torino, 10125 Torino) ; Nakao, M. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Nanut, T. (J. Stefan Institute, 1000 Ljubljana) ; Nath, K. J. (Indian Institute of Technology Guwahati, Assam 781039) ; Natkaniec, Z. (H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342) ; Nayak, M. (Wayne State University, Detroit, Michigan 48202) (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) ; Niiyama, M. (Kyoto University, Kyoto 606-8502) ; Nisar, N. K. (University of Pittsburgh, Pittsburgh, Pennsylvania 15260) ; Nishida, S. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Ogawa, S. (Toho University, Funabashi 274-8510) ; Okuno, S. (Kanagawa University, Yokohama 221-8686) ; Ono, H. (Nippon Dental University, Niigata 951-8580) (Niigata University, Niigata 950-2181) ; Pakhlov, P. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Physical Engineering Institute, Moscow 115409) ; Pakhlova, G. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Pal, B. (Brookhaven National Laboratory, Upton, New York 11973) ; Pardi, S. (INFN—Sezione di Napoli, 80126 Napoli) ; Park, H. (Kyungpook National University, Daegu 702-701) ; Paul, S. (Department of Physics, Technische Universität München, 85748 Garching) ; Pestotnik, R. (J. Stefan Institute, 1000 Ljubljana) ; Piilonen, L. E. (Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061) ; Popov, V. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Prencipe, E. (Forschungszentrum Jülich, 52425 Jülich) ; Rabusov, A. (Department of Physics, Technische Universität München, 85748 Garching) ; Ritter, M. (Ludwig Maximilians University, 80539 Munich) ; Rostomyan, A. (Deutsches Elektronen-Synchrotron, 22607 Hamburg) ; Russo, G. (INFN—Sezione di Napoli, 80126 Napoli) ; Sakai, Y. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Salehi, M. (University of Malaya, 50603 Kuala Lumpur) (Ludwig Maximilians University, 80539 Munich) ; Sandilya, S. (University of Cincinnati, Cincinnati, Ohio 45221) ; Santelj, L. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) ; Sanuki, T. (Department of Physics, Tohoku University, Sendai 980-8578) ; Savinov, V. (University of Pittsburgh, Pittsburgh, Pennsylvania 15260) ; Schneider, O. (École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015) ; Schnell, G. (University of the Basque Country UPV/EHU, 48080 Bilbao) (IKERBASQUE, Basque Foundation for Science, 48013 Bilbao) ; Schwanda, C. (Institute of High Energy Physics, Vienna 1050) ; Seino, Y. (Niigata University, Niigata 950-2181) ; Senyo, K. (Yamagata University, Yamagata 990-8560) ; Sevior, M. E. (School of Physics, University of Melbourne, Victoria 3010) ; Shebalin, V. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Shen, C. P. (Beihang University, Beijing 100191) ; Shibata, T.A. (Tokyo Institute of Technology, Tokyo 152-8550) ; Shiu, J.G. (Department of Physics, National Taiwan University, Taipei 10617) ; Shwartz, B. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Simon, F. (Max-Planck-Institut für Physik, 80805 München) (Excellence Cluster Universe, Technische Universität München, 85748 Garching) ; Singh, J. B. (Panjab University, Chandigarh 160014) ; Sokolov, A. (Institute for High Energy Physics, Protvino 142281) ; Solovieva, E. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Starič, M. (J. Stefan Institute, 1000 Ljubljana) ; Strube, J. F. (Pacific Northwest National Laboratory, Richland, Washington 99352) ; Sumihama, M. (Gifu University, Gifu 501-1193) ; Sumisawa, K. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Sumiyoshi, T. (Tokyo Metropolitan University, Tokyo 192-0397) ; Sutcliffe, W. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Takizawa, M. (Showa Pharmaceutical University, Tokyo 194-8543) (J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198) ; Tamponi, U. (INFN—Sezione di Torino, 10125 Torino) ; Tanida, K. (Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195) ; Tenchini, F. (School of Physics, University of Melbourne, Victoria 3010) ; Uchida, M. (Tokyo Institute of Technology, Tokyo 152-8550) ; Uglov, T. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Unno, Y. (Hanyang University, Seoul 133-791) ; Uno, S. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Urquijo, P. (School of Physics, University of Melbourne, Victoria 3010) ; Vahsen, S. E. (University of Hawaii, Honolulu, Hawaii 96822) ; Van Hulse, C. (University of the Basque Country UPV/EHU, 48080 Bilbao) ; Van Tonder, R. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Varner, G. (University of Hawaii, Honolulu, Hawaii 96822) ; Vinokurova, A. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Vorobyev, V. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) ; Vossen, A. (Duke University, Durham, North Carolina 27708) ; Wang, B. (University of Cincinnati, Cincinnati, Ohio 45221) ; Wang, C. H. (National United University, Miao Li 36003) ; Wang, P. (Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049) ; Wang, X. L. (Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443) ; Watanabe, M. (Niigata University, Niigata 950-2181) ; Watanuki, S. (Department of Physics, Tohoku University, Sendai 980-8578) ; Widmann, E. (Stefan Meyer Institute for Subatomic Physics, Vienna 1090) ; Won, E. (Korea University, Seoul 136-713) ; Ye, H. (Deutsches Elektronen-Synchrotron, 22607 Hamburg) ; Yin, J. H. (Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049) ; Yuan, C. Z. (Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049) ; Zhang, Z. P. (University of Science and Technology of China, Hefei 230026) ; Zhilich, V. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Zhukova, V. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Physical Engineering Institute, Moscow 115409) ; Zhulanov, V. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Zupanc, A. (Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana) (J. Stefan Institute, 1000 Ljubljana)

04 December 2018

Abstract: We report the observation of ϒ(2S)γηb(1S) decay based on an analysis of the inclusive photon spectrum of 24.7 fb1 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)γηb(1S)]=(6.10.70.6+0.6+0.9)×104 and derive an ηb(1S) mass of 9394.83.12.7+2.7+4.5 MeV/c2, 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.


Published in: Physical Review Letters 121 (2018)
Published by: APS
DOI: 10.1103/PhysRevLett.121.232001
arXiv: 1807.01201
License: CC-BY-4.0



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