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Study of eta and dipion transitions in Upsilon(4S) decays to lower bottomonia

Authors
Guido, E.Mussa, R.Tamponi, U.Adachi, I.Aihara, H.Al Said, S.Asner, D. M.Aulchenko, V.Aushev, T.Ayad, R.Badhrees, I.Bakich, A. M.Bansal, V.Behera, P.Bhardwaj, V.Bhuyan, B.Biswal, J.Bobrov, A.Bondar, A.Bozek, A.Bracko, M.Browder, T. E.Cervenkov, D.Chekelian, V.Chen, A.Cheon, B. G.Chilikin, K.Cho, K.Choi, S. -K.Choi, Y.Cinabro, D.Dash, N.Di Carlo, S.Dolezal, Z.Drasal, Z.Eidelman, S.Epifanov, D.Farhat, H.Fast, J. E.Ferber, T.Fulsom, B. G.Gaur, V.Gabyshev, N.Garmash, A.Gelb, M.Gillard, R.Goldenzweig, P.Haba, J.Hara, T.Hayasaka, K.Hayashii, H.Hedges, M. T.Hou, W. -S.Iijima, T.Inami, K.Inguglia, G.Ishikawa, A.Itoh, R.Iwasaki, Y.Jacobs, W. W.Jaegle, I.Jeon, H. B.Jia, S.Jin, Y.Joffe, D.Joo, K. K.Julius, T.Kang, K. H.Karyan, G.Kawasaki, T.Kim, D. Y.Kim, J. B.Kim, K. T.Kim, M. J.Kim, S. H.Kim, Y. J.Kinoshita, K.Kodys, P.Korpar, S.Kotchetkov, D.Krizan, P.Krokovny, P.Kulasiri, R.Kumita, T.Kuzmin, A.Kwon, Y. -J.Lange, J. S.Lewis, P.Li, C. H.Li, L.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.Moon, H. K.Mori, T.Nakano, E.Nakao, M.Nanut, T.Nath, J.Natkaniec, Z.Nayak, M.Niiyama, M.Nisar, N. K.Nishida, S.Ogawa, S.Ono, H.Pakhlov, P.Pakhlova, G.Pal, B.Pardi, S.Park, C. -S.Park, H.Paul, S.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Pulvermacher, C.Ritter, M.Rostomyan, A.Sakai, Y.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.Sokolov, A.Solovieva, E.Staric, M.Strube, J. F.Sumisawa, K.Sumiyoshi, T.Takizawa, M.Tanida, K.Tenchini, F.Trabelsi, K.Uchida, M.Uglov, T.Unno, Y.Uno, S.Usov, Y.Van Hulse, C.Varner, G.Vinokurova, A.Vorobyev, V.Vossen, A.Wang, C. H.Wang, P.Wang, X. L.Watanabe, M.Watanabe, Y.Watanuki, S.Widmann, E.Williams, K. M.Won, E.Yamashita, Y.Ye, H.Yuan, C. Z.Zhang, Z. P.Zhilich, V.Zhukova, V.Zhulanov, V.Zupanc, A.
Issue Date
28-9월-2017
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v.96, no.5
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW D
Volume
96
Number
5
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/82186
DOI
10.1103/PhysRevD.96.052005
ISSN
2470-0010
Abstract
We study hadronic transitions between bottomonium states using 496 fb(-1) data collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e(+)e(-) collider. We measure: B(Upsilon(4S) -> pi(+)pi(-)Upsilon(1S)) = (8.2 +/- 0.5(stat.)+/- 0.4(syst.)) x 10(-5), B(Upsilon(4S) -> pi(+)pi(-)Upsilon(2S)) = (7.9 +/- 1.0(stat.)+/- 0.4(syst.)) x 10(-5), and B(Upsilon(4S) -> eta Upsilon(1S)) = (1.70 +/- 0.23(stat.) +/- 0.08(syst.)) x 10(-4). We measure the ratio of branching fractions R=B(Upsilon(4S) -> eta Upsilon(1S))/B(Upsilon(4S) -> pi(+)pi(-)Upsilon(1S)) = 2.07 +/- 0.30(stat.)+/- 0.11(syst.). We search for the decay Upsilon(1(3)D(1,2)) -> eta Upsilon(1S), but do not find significant evidence for such a transition. We also measure the initial state radiation production cross sections of the Upsilon(2S,3S) resonances and we find values compatible with the expected ones. Finally, the analysis of the Upsilon(4S) -> pi(+)pi(-)Upsilon(1S) events shows indications for a resonant contribution due to the f(0)(980) meson.
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