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  • First observation of the hadronic transition $ \Upsilon(4S) \to \eta h_{b}(1P)$ and new measurement of the $h_b(1P)$ and $\eta_b(1S)$ parameters
    The Belle Collaboration; Tamponi, U; Mussa, R; Abdesselam, A; Aihara, H; Arinstein, K; Asner, D. M; Aushev, T; Ayad, R; Badhrees, I; Barberio, E; Bhuyan, B; Biswal, J; Bondar, A; Bozek, A; Bračko, M; Browder, T. E; Červenkov, D; Chen, A; Cheon, B. G; Cho, K; Chobanova, V; Choi, S. -K; Choi, Y; Danilov, M; Doležal, Z; Drásal, Z; Farhat, H; Fast, J. E; Ferber, T; Fulsom, B. G; Gaur, V; Garmash, A; Goh, Y. M; Golob, B; He, X. H; Hedges, M. T; Hou, W. -S; Inami, K; Ishikawa, A; Jaegle, I; Julius, T; Kato, E; Kichimi, H; Kim, D. Y; Kim, J. H; Kim, K. T; Kinoshita, K; Kodyš, P; Korpar, S; Križan, P; Krokovny, P; Kuzmin, A; Lewis, P; Libby, J; Matvienko, D; Miyabayashi, K; Mohanty, G. B; Natkaniec, Z; Nishida, S; Okuno, S; Olsen, S. L; Oswald, C; Pal, B; Park, H; Pedlar, T. K; Pesántez, L; Pestotnik, R; Petriřc, M; Piilonen, L. E; Rostomyan, A; Ryu, S; Sakai, Y; Sandilya, S; Santelj, L; Sanuki, T; Sato, Y; Schnell, G; Semmler, D; Senyo, K; Shapkin, M; Shibata, T. -A; Shwartz, B; Sohn, Y. -S; Sokolov, A; Tanida, K; Trabelsi, K; Uno, S; Urquijo, P; Van Hulse, C; Varner, G; Vinokurova, A; Vossen, A; Wagner, M. N; Wang, M. -Z; Williams, K. M; Won, E; Yamaoka, J; Yashchenko, S; Zhang, Z. P

    06/2015
    Journal Article

    Phys. Rev. Lett. 115, 142001 (2015) Using a sample of $771.6 \times 10^{6}$ $\Upsilon(4S)$ decays collected by the Belle experiment at the KEKB $e^+e^-$ collider, we observe for the first time the transition $\Upsilon(4S) \to \eta h_b(1P)$ with the branching fraction ${\cal B}\Upsilon(4S) \to \eta h_b(1P)= (2.18 \pm 0.11 \pm 0.18) \times 10^{-3}$ and we measure the $h_b(1P)$ mass $M_{h_{b}(1P)} = (9899.3 \pm 0.4 \pm 1.0)$ MeV/$c^{2}$, corresponding to the hyperfine splitting $\Delta M_{\mathrm HF}(1P) = (0.6 \pm 0.4 \pm 1.0)$ MeV/$c^{2}$. Using the transition $h_b(1P) \to \gamma \eta_b(1S)$, we measure the $\eta_b(1S)$ mass $M_{\eta_{b}(1S)} = (9400.7 \pm 1.7 \pm 1.6)$ MeV/$c^{2}$, corresponding to $\Delta M_{\mathrm HF}(1S) = (59.6 \pm 1.7 \pm 1.6)$ MeV/$c^{2}$, the $\eta_b(1S)$ width $\Gamma_{\eta_{b}(1S)} = (8 ^{+6}_{-5} \pm 5)$ MeV/$c^{2}$ and the branching fraction ${\cal B}h_b(1P) \to \gamma \eta_b(1S)= (56 \pm 8 \pm 4) \%$.

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