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  • First simultaneous measurement of $\Xi^0$ and $\bar{\Xi}^0$ asymmetry parameters in $\psi(3686)$ decay
    Ablikim, M; Achasov, M. N; An, Q; Bai, Y; Berger, N; Chang, J. F; Chen, S. M; Cheng, W. S; Choi, S. K; Denysenko, I; Dong, L. Y; Duan, Z. H; Egorov, P; Felici, G; Fritsch, M; Gao, H; Gao, Y. N; Ge, Z. W; Gersabeck, E. M; Guo, Y. P; Heinsius, F. H; Huang, G. S; Huang, K. X; Huang, X. T; Jeong, J. H; Ji, X. B; Jiao, Z; Kang, X. L; Kang, X. S; Kliemt, R; Lange, J. S; Li, D. M; Li, H. J; Li, J. S; Li, Ke; Li, L. K; Li, W. G; Li, X. L; Li, Z. J; Liang, Y. F; Liu, Huanhuan; Liu, Huihui; Liu, Q; Liu, W. M; Lu, J. G; Lu, X. L; Ma, R. T; Ma, X. Y; Nikolaev, I. B; Nisar, S; Niu, Y; Ouyang, Q; Pathak, A; Peters, K; Qi, T. Y; Qiu, J. F; Ren, K. J; Rosner, Ch; Salone, N; Shi, H. C; Shi, J. L; Sun, H; Sun, K; Sun, S. S; Sun, Z. T; Tat, M; Wang, F; Wang, S; Wang, X. J; Wang, X. L; Wang, Z; Wenzel, C. W; Wu, C; Wu, L. J; Wu, X; Wu, X. H; Xian, X. M; Xiang, T; Xiao, Y. L; Xie, Y. H; Xu, C. F; Ye, M. H; Yu, B. X; Yu, C. X; Yu, G; Yuan, S. C; Yue, C. X; Zeng, Y; Zhang, A. Q; Zhang, G. Y; Zhang, H. H; Zhang, Yao; Zhang, Z. H; Zhao, J; Zhao, M. G; Zheng, J. P; Zhou, X. R; Zhou, X. Y; Zhu, S. Q; Zhu, T. J

    02/2023
    Journal Article

    Phys. Rev. D 108, L011101 (2023) The $\Xi^0$ asymmetry parameters are measured using entangled quantum $\Xi^0$-$\bar{\Xi}^0$ pairs from a sample of $(448.1 \pm 2.9) \times 10^6$ $\psi(3686)$ events collected with the BESIII detector at BEPCII. The relative phase between the transition amplitudes of the $\Xi^0 \bar{\Xi}^0$ helicity states is measured to be $\Delta \Phi = -0.050 \pm 0.150 \pm 0.020$~rad, which implies that there is no obvious polarization at the current level of statistics. The decay parameters of the $\Xi^0$ hyperon $(\alpha_{\Xi^0}, \alpha_{\bar{\Xi}^0}, \phi_{\Xi^0}, \phi_{\bar{\Xi}^0})$ and the angular distribution parameter $(\alpha_{\psi(3686)})$ and $\Delta \Phi$ are measured simultaneously for the first time. In addition, the $CP$ asymmetry observables are determined to be $A^{\Xi^0}_{CP} = (\alpha_{\Xi^0} + \alpha_{\bar{\Xi}^0})/(\alpha_{\Xi^0} - \alpha_{\bar{\Xi}^0})$ $= -0.007$ $\pm$ 0.082 $\pm$ 0.025 and $\Delta \phi^{\Xi^0}_{CP} = (\phi_{\Xi^0} + \phi_{\bar{\Xi}^0})/2$ $= -0.079$ $\pm$ 0.082 $\pm$ 0.010 rad, which are consistent with $CP$ conservation.

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