arxiv: 2510.19571 · v2 · submitted 2025-10-22 · ✦ hep-ex
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Evidence of transverse polarization of Xi⁰ hyperon in psi(3686)rightarrowXi⁰bar{Xi}⁰
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Using $(2.712\pm0.014)\times10^{9}$ $\psi(3686)$ events collected with the BESIII detector at the BEPCII collider, we report an evidence of $\Xi^{0}$ transverse polarization with a significance of 4.4$\sigma$, a precise measurement of the branching fraction and the ratios between the $S$-wave and $D$-wave contributions of $\psi(3686)\to\Xi^{0}\bar\Xi^{0}$. The weak decay parameters ($\phi_{\Xi^0/\bar{\Xi}^{0}}$, $\alpha_{\Xi^0/\bar{\Xi}^{0}}$) and the angular distribution ($\alpha_{\psi}$) are also measured with higher precision compared to the previous measurements. Furthermore, two the $CP$ observables are also determined to be $A^{\Xi^0}_{CP} = -0.014 \pm 0.030 \pm 0.010$ and $\Delta\phi^{\Xi^0}_{CP} = 0.000 \pm 0.028 \pm 0.003$~rad, which are still consistent with $CP$ conservation at 1$\sigma$ level under the current statistics.
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