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Observation of gamma(2S) -> gamma eta(b)(1S) Decayopen accessObservation of I (2S) →γηb (1S) Decay

Other Titles
Observation of I (2S) →γηb (1S) Decay
Authors
Fulsom, B. G.Pedlar, T. K.Adachi, I.Aihara, H.Al Said, S.Asner, D. M.Atmacan, H.Aulchenko, V.Aushev, T.Ayad, R.Babu, V.Badhrees, I.Bakich, A. M.Bansal, V.Behera, P.Beleno, C.Berger, M.Bhardwaj, V.Bhuyan, B.Bilka, T.Biswal, J.Bondar, A.Bonvicini, G.Bozek, A.Bracko, M.Browder, T. E.Cao, L.Cervenkov, D.Chekelian, V.Chen, A.Cheon, Byung GuChilikin, K.Cho, K.Choi, S-K.Choi, Y.Choudhury, S.Cinabro, D.Cunliffe, S.Dash, N.Di Carlo, S.Dingfelder, J.Dolezal, Z.Dong, T. V.Drasal, Z.Eidelman, S.Epifanov, D.Fast, J. E.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, W. W.Jeon, H. B.Jia, S.Jin, Y.Joffe, D.Joo, K. K.Julius, T.Kawasaki, T.Kichimi, H.Kiesling, C.Kim, D. Y.Kim, H. J.Kim, J. B.Kim, K. T.Kim, S. H.Kinoshita, K.Kodys, P.Korpar, S.Kotchetkov, D.Krizan, P.Kroeger, R.Krokovny, P.Kuhr, T.Kulasiri, R.Kuzmin, A.Kwon, Y-J.Lange, J. S.Lee, I. S.Lee, S. C.Li, L. K.Li, Y. B.Gioi, L. LiLibby, J.Liventsev, D.Lubej, M.Luo, T.Masuda, M.Matsuda, T.Matvienko, D.Merola, M.Miyabayashi, K.Miyata, H.Mizuk, R.Mohanty, G. B.Moon, H. K.Mori, T.Mussa, R.Nakao, M.Nanut, T.Nath, K. J.Natkaniec, Z.Nayak, M.Niiyama, M.Nisar, N. K.Nishida, S.Ogawa, S.Okuno, S.Ono, H.Pakhlov, P.Pakhlova, G.Pal, B.Pardi, S.Park, H.Paul, S.Pestotnik, R.Piilonen, L. E.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, M. E.Shebalin, V.Shen, C. P.Shibata, T-A.Shiu, J-G.Shwartz, B.Simon, F.Singh, J. B.Sokolov, A.Solovieva, E.Staric, M.Strube, J. F.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, S. E.Van Hulse, C.Van Tonder, R.Varner, G.Vinokurova, A.Vorobyev, V.Vossen, A.Wang, B.Wang, C. H.Wang, P.Wang, X. L.Watanabe, M.Watanuki, S.Widmann, E.Won, E.Ye, H.Yin, J. H.Yuan, C. Z.Zhang, Z. P.Zhilich, V.Zhukova, V.Zhulanov, V.Zupanc, A.
Issue Date
Dec-2018
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.121, no.23, pp.1 - 8
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW LETTERS
Volume
121
Number
23
Start Page
1
End Page
8
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/148883
DOI
10.1103/PhysRevLett.121.232001
ISSN
0031-9007
Abstract
We report the observation of gamma(2S) -> gamma eta(b)(1S) based on an analysis of the inclusive photon spectrum of 24.7 fb(-1) of e(+)e(-) collisions at the gamma(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 [gamma(2S) -> gamma eta(b)(1S)] = (6.1(-0.7-0.6)(+0.6+0.9) x 10(-4) and derive an eta(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.
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