Using $(448.1\pm 2.9)\times {10}^6$ $\psi (3686)$ events collected with the BESIII detector and a single-baryon tagging technique, we present the first observation of the decays $\psi (3686)\to \mathrm{\Xi }(1530{)}^0\overline{\mathrm{\Xi }}(1530{)}^0$ and $\mathrm{\Xi }(1530{)}^0{\overline{\mathrm{\Xi }}}^0$. The branching fractions are measured to be $\mathcal{B}(\psi (3686)\to \mathrm{\Xi }(1530{)}^0\overline{\mathrm{\Xi }}(1530{)}^0)=(6.77\pm 0.14\pm 0.39)\times {10}^{-5}$ and $\mathcal{B}(\psi (3686)\to \mathrm{\Xi }(1530{)}^0{\overline{\mathrm{\Xi }}}^0)=(0.53\pm 0.04\pm 0.03)\times {10}^{-5}$. Here, the first and second uncertainties are statistical and systematic, respectively. In addition, the parameter associated with the angular distribution for the decay $\psi (3686)\to \mathrm{\Xi }(1530{)}^0\overline{\mathrm{\Xi }}(1530{)}^0$ is determined to be $\alpha =0.32\pm 0.19\pm 0.07$, in agreement with theoretical predictions within one standard deviation.

• Received 14 September 2021
• Accepted 15 October 2021
• Corrected 9 February 2023

DOI:https://doi.org/10.1103/PhysRevD.104.092012

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Published by the American Physical Society