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  • Study of the decays \(\chi_{cJ} \rightarrow \Lambda \bar{\Lambda}\phi\)
    Ablikim, M; Bertani, M; Bettoni, D; Chang, J F; Chen, H Y; Chen, S J; Chen, S L; Chen, Z Y; Dai, H L; Ding, B; Ding, Y; Dong, L Y; Dong, X; Fang, J; Feng, J H; Gao, Y N; Garbolino, S; Gilman, A; Gong, W X; Gradl, W; Greco, M; Guskov, A; Heng, Y K; Hou, G Y; Y Hu; Huang, Y S; Jackson, J; Jiang, S S; Jiang, T J; Kalantar-Nayestanaki, N; Kuessner, M; Lane, J J; Larin, P; Lavezzi, L; Cheng, Li; Li, Hui; Li, L K; X Li; Li, X H; Lin, C C; Liu, B X; Liu, Ke; Liu, Y; Liu, Z D; Lu, J G; Lu, X L; Luo, C L; Ma, F C; Maggiora, M; Nerling, F; Niu, W D; Pelizaeus, M; Peng, Y Y; Ping, R G; Qi, T Y; Qiao, X K; Qin, L Q; Qiu, J F; Rong, G; Shao, L G; Shi, J Y; Song, T Z; Song, Y J; Song, Y X; Sun, H; Sun, Z T; Tang, C J; Tao, Q T; Tat, M; Thoren, V; Wang, B L; Wang, F; Wang, Y L; Wollenberg, L; Wu, J F; Z Wu; Xia, L; Xu, Z S; Yan, X Q; Yang, Y; Ye, M H; Yu, C X; Yu, Y C; Yuan, J; Yuan, Z Y; Zeng, Y; Zeng, Y J; Zhang, J Q; Zhang, Jianyu; Zhang, Y; Zhang, Y H; Zhao, M G; Zheng, W J; Zheng, Y H; Zhong, B; Zhou, X Y; Zhu, K; Zhu, K S; Zhu, S H; Zhu, S Q

    arXiv.org, 05/2024
    Paper

    Based on \((2712.4 \pm 14.3) \times 10^{6}\) \( e^{+}e^{-}\to\psi(3686)\) events collected with the BESIII detector operating at the BEPCII collider, we report the first evidence of \(\chi_{c0}\to \Lambda\bar \Lambda \phi\) decays and the first observation of \(\chi_{c1,2}\to \Lambda\bar \Lambda \phi\) decays, with significances of \(4.5\sigma\), \(11.3\sigma\) and \(13.0\sigma\), respectively. The decay branching fractions of \(\chi_{c0,1,2}\to \Lambda\bar \Lambda\phi\) are measured to be \(( 2.99\pm1.24\pm0.19) \times 10^{-5}\), \((6.01\pm0.90\pm0.40 )\times 10^{-5}\), and \((7.13\pm0.81\pm0.36) \times 10^{-5}\), where the first uncertainties are statistical and the second systematic. No obvious enhancement near the \(\Lambda \bar{\Lambda}\) production threshold or excited \(\Lambda\) state is found in the \(\Lambda \phi\) (or \(\bar{\Lambda}\phi\)) system.

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