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  • Study of $\chi_{bJ}(2P)\to\omega\Upsilon(1S)$ at Belle
    Stottler, Z. S; Pedlar, T. K; Adamczyk, K; Said, S. Al; Banerjee, Sw; Belous, K; Bessner, M; Bilka, T; Bobrov, A; Bonvicini, G; Borah, J; Browder, T. E; Budano, A; Campajola, M; Červenkov, D; Chang, M. -C; Cheon, B. G; Cho, H. E; Cho, K; Choi, S. -K; Choi, Y; Choudhury, S; Das, S; De Nardo, G; De Pietro, G; Di Capua, F; Doležal, Z; Dong, T. V; Dubey, S; Epifanov, D; Ferlewicz, D; Garmash, A; Giri, A; Gu, T; Gudkova, K; Hadjivasiliou, C; Hara, T; Hazra, S; Hedges, M. T; Herrmann, D; Hou, W. -S; Inami, K; Ishikawa, A; Jin, Y; Kawasaki, T; Kim, D. Y; Kim, Y. -K; Kodyš, P; Križan, P; Krokovny, P; Kumar, M; Kumara, K; Kuzmin, A; Kwon, Y. -J; Lai, Y. -T; Lam, T; Lee, S. C; Levit, D; Meier, F; Merola, M; Miyabayashi, K; Mohanty, G. B; Nakamura, I; Natochii, A; Nishida, S; Ogawa, K; Ogawa, S; Oskin, P; Pang, T; Pardi, S; Park, S. -H; Patra, S; Paul, S; Pestotnik, R; Piilonen, L. E; Prencipe, E; Russo, G; Sandilya, S; Sangal, A; Savinov, V; Schnell, G; Schwanda, C; Senyo, K; Shapkin, M; Sharma, C; Shiu, J. -G; Sokolov, A; Solovieva, E; Sumihama, M; Takizawa, M; Tenchini, F; Varner, G; Watanuki, S; Werbycka, O; Yan, W; Yin, J. H; Yuan, C. Z; Yusa, Y; Zhang, Z. P; Zhukova, V

    06/2024
    Journal Article

    We report a study of the hadronic transitions $\chi_{bJ}(2P)\to\omega\Upsilon(1S)$, with $\omega\to\pi^{+}\pi^{-}\pi^{0}$, using $28.2\times10^6~\Upsilon(3S)$ mesons recorded by the Belle detector. We present the first evidence for the near--threshold transition $\chi_{b0}(2P)\to\omega\Upsilon(1S)$, the analog of the charm sector decay $\chi_{c1}(3872)\to\omega J/\psi$, with a branching fraction of $B\big(\chi_{b0}(2P)\to\omega\Upsilon(1S)\big) = \big(0.55\pm0.19\pm0.07\big)\%$. We also obtain branching fractions of $B\big(\chi_{b1}(2P)\to\omega\Upsilon(1S)\big) = \big(2.39{}^{+0.20}_{-0.19}\pm0.24\big)\%$ and $B\big(\chi_{b2}(2P)\to\omega\Upsilon(1S)\big) = \big(0.47{}^{+0.13}_{-0.12}\pm0.06\big)\%$, confirming the measurement of the $\omega$ transitions of the $J=1,2~P$--wave states. The ratio for the $J=2$ to $J=1$ transitions is also measured and found to differ by 3.3 standard deviations from the expected value in the QCD multipole expansion.

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