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  • First Observation of the Hadronic Transition ϒ(4S)→ηh(b)(1P) and New Measurement of the h(b)(1P) and η(b)(1S) Parameters
    Tamponi, U; Abdesselam, A; Asner, D M; Aushev, T; Badhrees, I; Barberio, E; Bhardwaj, V; Bhuyan, B; Biswal, J; Bondar, A; Bonvicini, G; Červenkov, D; Chen, A; Chobanova, V; Choi, S-K; Choi, Y; Danilov, M; Drásal, Z; Drutskoy, A; Epifanov, D; Farhat, H; Fast, J E; Ferber, T; Fulsom, B G; Gaur, V; Gabyshev, N; Getzkow, D; Gillard, R; Haba, J; Hayasaka, K; Hayashii, H; He, X H; Hedges, M T; Hou, W-S; Inami, K; Ishikawa, A; Jaegle, I; Julius, T; Kato, E; Katrenko, P; Kichimi, H; Kiesling, C; Kim, H J; Kim, J H; Kodyš, P; Korpar, S; Križan, P; Krokovny, P; Kuzmin, A; Lewis, P; Lukin, P; Miyata, H; Mizuk, R; Mohanty, G B; Mori, T; Nakao, M; Natkaniec, Z; Nisar, N K; Olsen, S L; Oswald, C; Pakhlova, G; Pal, B; Pedlar, T K; Pesántez, L; Pestotnik, R; Petrič, M; Piilonen, L E; Ritter, M; Rostomyan, A; Ryu, S; Santelj, L; Sanuki, T; Sato, Y; Schneider, O; Schnell, G; Semmler, D; Sevior, M E; Shapkin, M; Shen, C P; Shibata, T-A; Shwartz, B; Sokolov, A; Tanida, K; Teramoto, Y; Trabelsi, K; Uchida, M; Uglov, T; Unno, Y; Urquijo, P; Van Hulse, C; Vanhoefer, P; Vossen, A; Wagner, M N; Wang, M-Z; Watanabe, Y; Won, E; Yashchenko, S; Zhang, Z P; Zhulanov, V; Zupanc, A

    Physical review letters, 2015-Oct-02, Letnik: 115, Številka: 14
    Journal Article

    Using a sample of 771.6×10(6) ϒϒ(4S) decays collected by the Belle experiment at the KEKB e(+)e(-) collider, we observe, for the first time, the transition ϒ(4S)→ηh(b)(1P) with the branching fraction Bϒ(4S)→ηh(b)(1P)=(2.18±0.11±0.18)×10(-3) and we measure the h(b)(1P) mass M(h(b)(1P))=(9899.3±0.4±1.0)  MeV/c(2), corresponding to the hyperfine (HF) splitting ΔM(HF)(1P)=(0.6±0.4±1.0)  MeV/c(2). Using the transition h(b)(1P)→γη(b)(1S), we measure the η(b)(1S) mass M(η(b)(1S))=(9400.7±1.7±1.6)  MeV/c(2), corresponding to ΔM(HF)(1S)=(59.6±1.7±1.6)  MeV/c(2), the η(b)(1S) width Γ(η(b)(1S))=(8(-5)(+6)±5)  MeV/c(2) and the branching fraction Bh(b)(1P)→γη(b)(1S)=(56±8±4)%.

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