Observation of ϒ(2S)→γη_{b}(1S) Decay.

Published

Journal Article

We report the observation of ϒ(2S)→γη_{b}(1S) decay based on an analysis of the inclusive photon spectrum of 24.7  fb^{-1} of e^{+}e^{-} collisions at the ϒ(2S) center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We measure a branching fraction of B[ϒ(2S)→γη_{b}(1S)]=(6.1_{-0.7-0.6}^{+0.6+0.9})×10^{-4} and derive an η_{b}(1S) mass of 9394.8_{-3.1-2.7}^{+2.7+4.5}  MeV/c^{2}, where the uncertainties are statistical and systematic, respectively. The significance of our measurement is greater than 7 standard deviations, constituting the first observation of this decay mode.

Full Text

Duke Authors

Cited Authors

  • Fulsom, BG; Pedlar, TK; Adachi, I; Aihara, H; Al Said, S; Asner, DM; Atmacan, H; Aulchenko, V; Aushev, T; Ayad, R; Babu, V; Badhrees, I; Bakich, AM; Bansal, V; Behera, P; Beleño, C; Berger, M; Bhardwaj, V; Bhuyan, B; Bilka, T; Biswal, J; Bondar, A; Bonvicini, G; Bozek, A; Bračko, M; Browder, TE; Cao, L; Červenkov, D; Chekelian, V; Chen, A; Cheon, BG; Chilikin, K; Cho, K; Choi, S-K; Choi, Y; Choudhury, S; Cinabro, D; Cunliffe, S; Dash, N; Di Carlo, S; Dingfelder, J; Doležal, Z; Dong, TV; Drásal, Z; Eidelman, S; Epifanov, D; Fast, JE; Ferber, T; Garg, R; Gaur, V; Gabyshev, N; Garmash, A; Gelb, M; Giri, A; Goldenzweig, P; Guido, E; Haba, J; Hayasaka, K; Hayashii, H; Hirose, S; Hou, W-S; Iijima, T; Inami, K; Inguglia, G; Ishikawa, A; Itoh, R; Iwasaki, M; Iwasaki, Y; Jacobs, WW; Jeon, HB; Jia, S; Jin, Y; Joffe, D; Joo, KK; Julius, T; Kawasaki, T; Kichimi, H; Kiesling, C; Kim, DY; Kim, HJ; Kim, JB; Kim, KT; Kim, SH; Kinoshita, K; Kodyš, P; Korpar, S; Kotchetkov, D; Križan, P; Kroeger, R; Krokovny, P; Kuhr, T; Kulasiri, R; Kuzmin, A; Kwon, Y-J; Lange, JS; Lee, IS; Lee, SC; Li, LK; Li, YB; Li Gioi, L; Libby, J; Liventsev, D; Lubej, M; Luo, T; Masuda, M; Matsuda, T; Matvienko, D; Merola, M; Miyabayashi, K; Miyata, H; Mizuk, R; Mohanty, GB; Moon, HK; Mori, T; Mussa, R; Nakao, M; Nanut, T; Nath, KJ; Natkaniec, Z; Nayak, M; Niiyama, M; Nisar, NK; Nishida, S; Ogawa, S; Okuno, S; Ono, H; Pakhlov, P; Pakhlova, G; Pal, B; Pardi, S; Park, H; Paul, S; Pestotnik, R; Piilonen, LE; Popov, V; Prencipe, E; Rabusov, A; Ritter, M; Rostomyan, A; Russo, G; Sakai, Y; Salehi, M; Sandilya, S; Santelj, L; Sanuki, T; Savinov, V; Schneider, O; Schnell, G; Schwanda, C; Seino, Y; Senyo, K; Sevior, ME; Shebalin, V; Shen, CP; Shibata, T-A; Shiu, J-G; Shwartz, B; Simon, F; Singh, JB; Sokolov, A; Solovieva, E; Starič, M; Strube, JF; Sumihama, M; Sumisawa, K; Sumiyoshi, T; Sutcliffe, W; Takizawa, M; Tamponi, U; Tanida, K; Tenchini, F; Uchida, M; Uglov, T; Unno, Y; Uno, S; Urquijo, P; Vahsen, SE; Van Hulse, C; Van Tonder, R; Varner, G; Vinokurova, A; Vorobyev, V; Vossen, A; Wang, B; Wang, CH; Wang, P; Wang, XL; Watanabe, M; Watanuki, S; Widmann, E; Won, E; Ye, H; Yin, JH; Yuan, CZ; Zhang, ZP; Zhilich, V; Zhukova, V; Zhulanov, V; Zupanc, A; Belle Collaboration,

Published Date

  • December 2018

Published In

Volume / Issue

  • 121 / 23

Start / End Page

  • 232001 -

PubMed ID

  • 30576207

Pubmed Central ID

  • 30576207

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.121.232001

Language

  • eng