Observation of $\Upsilon(4S)\to \eta' \Upsilon(1S)$
Creators: name: Guido, E.
name: Mussa, R.
name: Tamponi, U.
name: Aihara, H.
name: Al Said, S.
name: Asner, D. M.
name: Atmacan, H.
name: Aulchenko, V.
name: Aushev, T.
name: Ayad, R.
name: Babu, V.
name: Badhrees, I.
name: Bakich, A. M.
name: Bansal, V.
name: Behera, P.
name: Berger, M.
name: Bhardwaj, V.
name: Biswal, J.
name: Bondar, A.
name: Bonvicini, G.
name: Bozek, A.
name: Bračko, M.
name: Browder, T. E.
name: Červenkov, D.
name: Chekelian, V.
name: Chen, A.
name: Cheon, B. G.
name: Chilikin, K.
name: Cho, K.
name: Choi, S.-K.
name: Choi, Y.
name: Choudhury, S.
name: Cinabro, D.
name: Cunliffe, S.
name: Di Carlo, S.
name: Doležal, Z.
name: Eidelman, S.
name: Epifanov, D.
name: Fast, J. E.
name: Ferber, T.
name: Fulsom, B. G.
name: Garg, R.
name: Gaur, V.
name: Gabyshev, N.
name: Garmash, A.
name: Gelb, M.
name: Giri, A.
name: Goldenzweig, P.
name: Haba, J.
name: Hara, T.
name: Hayashii, H.
name: Hedges, M. T.
name: Hou, W.-S.
name: Inami, K.
name: Inguglia, G.
name: Ishikawa, A.
name: Itoh, R.
name: Iwasaki, M.
name: Iwasaki, Y.
name: Jacobs, W. W.
name: Jeon, H. B.
name: Jia, S.
name: Jin, Y.
name: Julius, T.
name: Kang, K. H.
name: Karyan, G.
name: Kawasaki, T.
name: Kiesling, C.
name: Kim, D. Y.
name: Kim, J. B.
name: Kim, K. T.
name: Kim, S. H.
name: Kinoshita, K.
name: Kodyš, P.
name: Korpar, S.
name: Kotchetkov, D.
name: Križan, P.
name: Kroeger, R.
name: Krokovny, P.
name: Kulasiri, R.
name: Kumar, R.
name: Kumita, T.
name: Kuzmin, A.
name: Kwon, Y.-J.
name: Lee, I. S.
name: Lee, S. C.
name: Li, L. K.
name: Li, Y. B.
name: Li Gioi, L.
name: Libby, J.
name: Liventsev, D.
name: Lubej, M.
name: Luo, T.
name: MacNaughton, J.
name: Masuda, M.
name: Matsuda, T.
name: Matvienko, D.
name: Merola, M.
name: Miyabayashi, K.
name: Miyata, H.
name: Mizuk, R.
name: Mohanty, G. B.
name: Moon, H. K.
name: Mori, T.
name: Nakano, E.
name: Nakao, M.
name: Nanut, T.
name: Nath, K. J.
name: Nayak, M.
name: Niiyama, M.
name: Nishida, S.
name: Ogawa, S.
name: Ono, H.
name: Ostrowicz, W.
name: Pakhlova, G.
name: Pal, B.
name: Pardi, S.
name: Park, C. W.
name: Paul, S.
name: Pedlar, T. K.
name: Pestotnik, R.
name: Piilonen, L. E.
name: Popov, V.
name: Rostomyan, A.
name: Russo, G.
name: Sakai, Y.
name: Salehi, M.
name: Sanuki, T.
name: Schneider, O.
name: Schnell, G.
name: Schwanda, C.
name: Seino, Y.
name: Shebalin, V.
name: Shen, C. P.
name: Shibata, T.-A.
name: Shiu, J.-G.
name: Shwartz, B.
name: Sokolov, A.
name: Starič, M.
name: Strube, J. F.
name: Sumihama, M.
name: Sumiyoshi, T.
name: Takizawa, M.
name: Tanida, K.
name: Tenchini, F.
name: Uchida, M.
name: Uglov, T.
name: Unno, Y.
name: Usov, Y.
name: Van Hulse, C.
name: Varner, G.
name: Vinokurova, A.
name: Wang, B.
name: Wang, C. H.
name: Wang, M.-Z.
name: Wang, P.
name: Wang, X. L.
name: Watanabe, M.
name: Watanabe, Y.
name: Widmann, E.
name: Won, E.
name: Ye, Hua
name: Yelton, J.
name: Yuan, C. Z.
name: Yusa, Y.
name: Zakharov, S.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhukova, V.
name: Zhulanov, V.
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2018
Subjects: subject: 550
subject: electron positron: annihilation
subject: electron positron: colliding beams
subject: Upsilon(10570): electroproduction
subject: Upsilon(10570): hadronic decay
subject: eta(958): radiative decay
subject: Upsilon(9460)
subject: Upsilon(10570): branching ratio: measured
subject: KEK-B
subject: BELLE
subject: 4/3
subject: experimental results
subject: Upsilon(10570) --&gt; eta(958) Upsilon(9460)
subject: eta(958) --&gt; rho(770)0 photon
subject: eta(958) --&gt; eta pi+ pi-
subject: eta --&gt; 2photon
subject: 10.57 GeV-cms

description: We report the first observation of the hadronic transition $ϒ(4S) → η′ϒ(1S)$, using 496 fb$^{-1}$ data collected at the $ϒ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We reconstruct the $η′$ meson through its decays to $ρ^0 γ$ and to $π^+ π^-η$, with $η → γγ$. We measure $B(ϒ(4S) → η′ϒ(1S))=[3.43±0.88(stat)±0.21(syst)] × 10^{-5}$, with a significance of 5.7$σ$.