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  • Observation of the Radiative Decays of ϒ(1S) to χ_{c1}
    Adachi, I; Aihara, H; Aushev, T; Badhrees, I; Bhardwaj, V; Bhuyan, B; Bobrov, A; Bračko, M; Chen, A; Chilikin, K; Cho, H E; Cho, K; Choi, S-K; Choudhury, S; Cunliffe, S; Doležal, Z; Dong, T V; Eidelman, S; Epifanov, D; Garg, R; Gaur, V; Gabyshev, N; Garmash, A; Giri, A; Golob, B; Grzymkowska, O; Hayasaka, K; Hou, W-S; Inami, K; Iwasaki, M; Iwasaki, Y; Joffe, D; Joo, K K; Karyan, G; Kim, D Y; Kim, K T; Kinoshita, K; Kodyš, P; Korpar, S; Križan, P; Kuhr, T; Lee, S C; Lewis, P; Li Gioi, L; Lieret, K; MacQueen, C; Masuda, M; Matvienko, D; Merola, M; Miyabayashi, K; Miyata, H; Mizuk, R; Mohanty, G B; Mussa, R; Nakano, T; Nishida, S; Ono, H; Oskin, P; Pakhlov, P; Pakhlova, G; Pang, T; Pardi, S; Park, C W; Park, H; Park, S-H; Paul, S; Pedlar, T K; Piilonen, L E; Ritter, M; Rostomyan, A; Rout, N; Russo, G; Schneider, O; Schwanda, C; Seino, Y; Senyo, K; Shiu, J-G; Solovieva, E; Starič, M; Stottler, Z S; Takizawa, M; Tamponi, U; Tanida, K; Trabelsi, K; Uchida, M; Uehara, S; Uglov, T; Unno, Y; Urquijo, P; Van Tonder, R; Varner, G; Vossen, A; Wang, C H; Wang, X L; Yang, S B; Yelton, J; Yuan, C Z; Yusa, Y; Zhilich, V; Zhukova, V

    Physical review letters, 2020-Mar-27, Letnik: 124, Številka: 12
    Journal Article

    We report the first observation of the radiative decay of the ϒ(1S) into a charmonium state. The significance of the observed signal of ϒ(1S)→γχ_{c1} is 6.3 standard deviations including systematics. The branching fraction is calculated to be Bϒ(1S)→γχ_{c1}=4.7_{-1.8}^{+2.4}(stat)_{-0.5}^{+0.4}(sys)×10^{-5}. We also searched for ϒ(1S) radiative decays into χ_{c0,2} and η_{c}(1S,2S), and set upper limits on their branching fractions. These results are obtained from a 24.9  fb^{-1} data sample collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider at a center-of-mass energy equal to the ϒ(2S) mass using ϒ(1S) tagging by the ϒ(2S)→ϒ(1S)π^{+}π^{-} transitions.

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