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  • First Study of Reaction Ξ^{0}n→Ξ^{-}p Using Ξ^{0}-Nucleus Scattering at an Electron-Positron Collider
    Achasov, M N; Amoroso, A; An, Q; Batozskaya, V; Bianchi, F; Bloms, J; Chelkov, G; Chen, C; Cheng, W S; Chu, X; de Boer, R E; Deng, Z Y; Du, S X; Duan, Z H; Fan, Y L; Fang, Y; Felici, G; Fritzsch, C; Fu, Y W; Gradl, W; Gu, M H; Guo, L B; Hu, H M; Hu, T; Huang, X T; Jeong, J H; Khoukaz, A; Kliemt, R; Lavezzi, L; Lei, Z H; Li, F; Li, G; Li, H; Li, H N; Liu, Feng; Liu, G M; Liu, J B; Liu, Ke; Liu, P L; Liu, S B; Liu, T; Liu, W M; Lu, X L; Lu, Y; Luo, T; Ma, L L; Maas, F E; Mao, Z P; Min, T J; Olsen, S L; Peters, K; Ping, J L; Shangguan, J F; Sun, H; Tang, G Y; Tian, Z F; Wang, F; Wang, T J; Wang, W; Wang, Y; Wang, Y F; Wang, Y H; Wang, Yi; Wei, D; Wu, L J; Xiao, G Y; Xie, Y G; Xie, Y H; Xu, H Y; Xu, Y C; Yan, W C; Yang, H L; Yang, Y; Yang, Yifan; Yin, J H; Yu, C X; Yu, G; Yu, X D; Zeng, F R; Zeng, Y; Zhang, B L; Zhang, D H; Zhang, G Y; Zhang, Jianyu; Zhang, Q Y; Zhang, Shulei; Zhang, X Y; Zhang, X Y; Zhang, Y H; Zhang, Yao; Zhang, Z Y; Zhao, Lei; Zhao, M G; Zhao, Z G; Zheng, B; Zheng, J P; Zheng, Y H; Zhong, X; Zhou, Y Z; Zhu, K

    Physical review letters, 2023-Jun-23, 20230623, Volume: 130, Issue: 25
    Journal Article

    Using (1.0087±0.0044)×10^{10}  J/ψ events collected with the BESIII detector at the BEPCII storage ring, the process Ξ^{0}n→Ξ^{-}p is studied, where the Ξ^{0} baryon is produced in the process J/ψ→Ξ^{0}Ξover ¯^{0} and the neutron is a component of the ^{9}Be, ^{12}C, and ^{197}Au nuclei in the beam pipe. A clear signal is observed with a statistical significance of 7.1σ. The cross section of the reaction Ξ^{0}+^{9}Be→Ξ^{-}+p+^{8}Be is determined to be σ(Ξ^{0}+^{9}Be→Ξ^{-}+p+^{8}Be)=(22.1±5.3_{stat}±4.5_{sys})  mb at the Ξ^{0} momentum of 0.818  GeV/c, where the first uncertainty is statistical and the second is systematic. No significant H-dibaryon signal is observed in the Ξ^{-}p final state. This is the first study of hyperon-nucleon interactions in electron-positron collisions and opens up a new direction for such research.

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