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

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. BrowderD. 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

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Abstract

Using a sample of 771.6×106 ΓΓ(4S) decays collected by the Belle experiment at the KEKB e+e- collider, we observe, for the first time, the transition Γ(4S)→ηhb(1P) with the branching fraction B[Γ(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)%.

Original languageEnglish
Article number142001
JournalPhysical Review Letters
Volume115
Issue number14
DOIs
StatePublished - 29 Sep 2015

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