First observation of the hadronic transition $ Υ(4S) \to ηh_{b}(1P)$ and new measurement of the $h_b(1P)$ and $η_b(1S)$ parameters
Creators: name: The Belle Collaboration
name: Tamponi, U.
name: Mussa, R.
name: Abdesselam, A.
name: Aihara, H.
name: Arinstein, K.
name: Asner, D. M.
name: Atmacan, H.
name: Aushev, T.
name: Ayad, R.
name: Badhrees, I.
name: Bakich, A. M.
name: Barberio, E.
name: Bhardwaj, V.
name: Bhuyan, B.
name: Biswal, J.
name: Bondar, A.
name: Bonvicini, G.
name: Bozek, A.
name: Bračko, M.
name: Browder, T. E.
name: Červenkov, D.
name: Chen, A.
name: Cheon, B. G.
name: Cho, K.
name: Chobanova, V.
name: Choi, S. -K.
name: Choi, Y.
name: Cinabro, D.
name: Danilov, M.
name: Doležal, Z.
name: Drásal, Z.
name: Drutskoy, A.
name: Eidelman, S.
name: Epifanov, D.
name: Farhat, H.
name: Fast, J. E.
name: Ferber, T.
name: Fulsom, B. G.
name: Gaur, V.
name: Gabyshev, N.
name: Garmash, A.
name: Getzkow, D.
name: Gillard, R.
name: Goh, Y. M.
name: Golob, B.
name: Haba, J.
name: Hayasaka, K.
name: Hayashii, H.
name: He, X. H.
name: Hedges, M. T.
name: Hou, W. -S.
name: Iijima, T.
name: Inami, K.
name: Ishikawa, A.
name: Jaegle, I.
name: Joffe, D.
name: Julius, T.
name: Kato, E.
name: Katrenko, P.
name: Kichimi, H.
name: Kiesling, C.
name: Kim, D. Y.
name: Kim, H. J.
name: Kim, J. H.
name: Kim, K. T.
name: Kim, S. H.
name: Kinoshita, K.
name: Kodyš, P.
name: Korpar, S.
name: Križan, P.
name: Krokovny, P.
name: Kumita, T.
name: Kuzmin, A.
name: Lange, J. S.
name: Lewis, P.
name: Libby, J.
name: Lukin, P.
name: Matvienko, D.
name: Miyabayashi, K.
name: Miyata, H.
name: Mizuk, R.
name: Mohanty, G. B.
name: Moll, A.
name: Mori, T.
name: Nakano, E.
name: Nakao, M.
name: Nanut, T.
name: Natkaniec, Z.
name: Nayak, M.
name: Nisar, N. K.
name: Nishida, S.
name: Ogawa, S.
name: Okuno, S.
name: Olsen, S. L.
name: Ostrowicz, W.
name: Oswald, C.
name: Pakhlova, G.
name: Pal, B.
name: Park, H.
name: Pedlar, T. K.
name: Pesántez, L.
name: Pestotnik, R.
name: Petriřc, M.
name: Piilonen, L. E.
name: Ribežl, E.
name: Ritter, M.
name: Rostomyan, A.
name: Ryu, S.
name: Sakai, Y.
name: Sandilya, S.
name: Santelj, L.
name: Sanuki, T.
name: Sato, Y.
name: Savinov, V.
name: Schneider, O.
name: Schnell, G.
name: Schwanda, C.
name: Semmler, D.
name: Senyo, K.
name: Sevior, M. E.
name: Shapkin, M.
name: Shebalin, V.
name: Shen, C. P.
name: Shibata, T. -A.
name: Shiu, J. -G.
name: Shwartz, B.
name: Sibidanov, A.
name: Simon, F.
name: Sohn, Y. -S.
name: Sokolov, A.
name: Starič, M.
name: Steder, M.
name: Stypula, J.
name: Tanida, K.
name: Teramoto, Y.
name: Trabelsi, K.
name: Uchida, M.
name: Uglov, T.
name: Unno, Y.
name: Uno, S.
name: Urquijo, P.
name: Van Hulse, C.
name: Vanhoefer, P.
name: Varner, G.
name: Vinokurova, A.
name: Vossen, A.
name: Wagner, M. N.
name: Wang, M. -Z.
name: Wang, X. L.
name: Watanabe, Y.
name: Williams, K. M.
name: Won, E.
name: Yamaoka, J.
name: Yashchenko, S.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhulanov, V.
name: Zupanc, A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Using a sample of $771.6 \times 10^{6}$ $Υ(4S)$ decays collected by the Belle experiment at the KEKB $e^+e^-$ collider, we observe for the first time the transition $Υ(4S) \to ηh_b(1P)$ with the branching fraction ${\cal B}[Υ(4S) \to ηh_b(1P)]= (2.18 \pm 0.11 \pm 0.18) \times 10^{-3}$ 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 $ΔM_{\mathrm HF}(1P) = (0.6 \pm 0.4 \pm 1.0)$ MeV/$c^{2}$. Using the transition $h_b(1P) \to γη_b(1S)$, we measure the $η_b(1S)$ mass $M_{η_{b}(1S)} = (9400.7 \pm 1.7 \pm 1.6)$ MeV/$c^{2}$, corresponding to $ΔM_{\mathrm HF}(1S) = (59.6 \pm 1.7 \pm 1.6)$ MeV/$c^{2}$, the $η_b(1S)$ width $Γ_{η_{b}(1S)} = (8 ^{+6}_{-5} \pm 5)$ MeV/$c^{2}$ and the branching fraction ${\cal B}[h_b(1P) \to γη_b(1S)]= (56 \pm 8 \pm 4) \%$.
description: 7 pages, 2 figures, submitted to Phys. Rev. Lett