First Observation of the Hadronic Transition ϒ(4S)→ηhb(1P) and New Measurement of the hb(1P) and ηb(1S) Parameters
Year: 2015
Type: article
Abstract: Using a sample of $771.6\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\mathrm{\ensuremath{\Upsilon}}\mathrm{\ensuremath{\Upsilon}}(4S)$ decays collected by the Belle experiment at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider, we observe, for the first time, the transition $\mathrm{\ensuremath{\Upsilon}}(4S)\ensuremath{\rightarrow}\ensuremath{\eta}{h}_{b}(1P)$ with the branching fraction $\mathcal{B}[\mathrm{\ensuremath{\Upsilon}}(4S)\ensuremath{\rightarrow}\ensuremath{\eta}{h}_{b}(1P)]=(2.18\ifmmode\pm\else\textpm\fi{}0.11\ifmmode\pm\else\textpm\fi{}0.18)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ and we measure the ${h}_{b}(1P)$ mass ${M}_{{h}_{b}(1P)}=\phantom{\rule{0ex}{0ex}}(9899.3\ifmmode\pm\else\textpm\fi{}0.4\ifmmode\pm\else\textpm\fi{}1.0)\text{ }\mathrm{MeV}/{c}^{2}$, corresponding to the hyperfine (HF) splitting $\mathrm{\ensuremath{\Delta}}{M}_{\mathrm{HF}}(1P)=\phantom{\rule{0ex}{0ex}}(0.6\ifmmode\pm\else\textpm\fi{}0.4\ifmmode\pm\else\textpm\fi{}1.0)\text{ }\mathrm{MeV}/{c}^{2}$. Using the transition ${h}_{b}(1P)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{b}(1S)$, we measure the ${\ensuremath{\eta}}_{b}(1S)$ mass ${M}_{{\ensuremath{\eta}}_{b}(1S)}=(9400.7\ifmmode\pm\else\textpm\fi{}1.7\ifmmode\pm\else\textpm\fi{}1.6)\text{ }\mathrm{MeV}/{c}^{2}$, corresponding to $\mathrm{\ensuremath{\Delta}}{M}_{\mathrm{HF}}(1S)=(59.6\ifmmode\pm\else\textpm\fi{}1.7\ifmmode\pm\else\textpm\fi{}1.6)\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, the ${\ensuremath{\eta}}_{b}(1S)$ width ${\mathrm{\ensuremath{\Gamma}}}_{{\ensuremath{\eta}}_{b}(1S)}=({8}_{\ensuremath{-}5}^{+6}\ifmmode\pm\else\textpm\fi{}5)\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and the branching fraction $\mathcal{B}[{h}_{b}(1P)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{b}(1S)]=\phantom{\rule{0ex}{0ex}}(56\ifmmode\pm\else\textpm\fi{}8\ifmmode\pm\else\textpm\fi{}4)%$.
Source: Physical Review Letters
Authors: 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
Institutions: Istituto Nazionale di Fisica Nucleare, Sezione di Torino, University of Turin, University of Tabuk, The University of Tokyo, Novosibirsk State University, Siberian Branch of the Russian Academy of Sciences, Budker Institute of Nuclear Physics, Pacific Northwest National Laboratory, Middle East Technical University, Moscow Institute of Physics and Technology, Institute for Theoretical and Experimental Physics, King Abdulaziz City for Science and Technology, The University of Sydney, The University of Melbourne, University of South Carolina, Indian Institute of Technology Guwahati, Jožef Stefan Institute, Wayne State University, Institute of Nuclear Physics, Polish Academy of Sciences, University of Maribor, University of Hawaiʻi at Mānoa, University of Hawaii System, Charles University, National Central University, Hanyang University, Korea Institute of Science & Technology Information, Max Planck Institute for Physics, Gyeongsang National University, Sungkyunkwan University, National Research Nuclear University MEPhI, Deutsches Elektronen-Synchrotron DESY, Tata Institute of Fundamental Research, Justus-Liebig-Universität Gießen, University of Ljubljana, High Energy Accelerator Research Organization, The Graduate University for Advanced Studies, SOKENDAI, Nagoya University, Nara Women's University, Peking University, National Taiwan University, Tohoku University, Kennesaw State University, Soongsil University, Kyungpook National University, Korea University, University of Cincinnati, Tokyo Metropolitan University, Indian Institute of Technology Madras, Niigata University, Excellence Cluster Universe, Technical University of Munich, Osaka City University, Toho University, Kanagawa University, Seoul National University, University of Bonn, Luther College, Virginia Tech, University of Pittsburgh, École Polytechnique Fédérale de Lausanne, Ikerbasque, University of the Basque Country, Institute of High Energy Physics, Yamagata University, Institute for High Energy Physics, Beihang University, Tokyo Institute of Technology, Yonsei University, Indiana University Bloomington, Indiana University, University of Science and Technology of China
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, U.S. Department of Energy, Department of Science and Technology, Ministry of Science and Technology, India, Deutsche Forschungsgemeinschaft, Ministry of Education, Culture, Sports, Science and Technology, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, National Natural Science Foundation of China, Ministerstvo Školství, Mládeže a Tělovýchovy, National Science Council, Russian Foundation for Basic Research, Austrian Science Fund, Euskal Herriko Unibertsitatea, Ministry of Environment, Ministry of Science, ICT and Future Planning, Korea Institute of Science and Technology Information, National Research Foundation of Korea, Ikerbasque, Basque Foundation for Science, Narodowe Centrum Nauki, Javna Agencija za Raziskovalno Dejavnost RS, Ministry of Education, India, Ministerstwo Edukacji i Nauki, Ministry of Economic Affairs, Istituto Nazionale di Fisica Nucleare, Australian Research Council, Japan Society for the Promotion of Science, Instituto Nazionale di Fisica Nucleare, Universitat Politècnica de València, Great Southern Development Commission, Government of Western Australia, Veterinary Services and Animal Health, Ministry of Agriculture and Rural Development, Pacific Northwest National Laboratory
Award: G6168134868
OpenAlex ID: W2119937810