Observation of ψ(3686) → $$ {\Xi}^{-}{K}_S^0{\overline{\varOmega}}^{+} $$ + c.c.

A bstract Using a sample of (2 . 712 ± 0 . 014) × 10 9 ψ (3686) events collected with the BESIII detector at the electron positron collider BEPCII, the decay ψ (3686) → $$ {\Xi}^{-}{K}_S^0{\overline{\varOmega}}^{+} $$ Ξ − K S 0 Ω ¯ + + c.c. is observed for the first time, which has a significance of 5.9 standard deviations. The branching fraction of this decay is measured to be (2 . 91 ± 0 . 47 ± 0 . 33) × 10 − 6 , where the first and second uncertainties are statistical and systematic, respectively. The ratio between $$ {\mathcal{B}}_{\psi (3686)\to {\varXi}^{-}{K}_S^0{\overline{\varOmega}}^{+}+c.c} $$ B ψ 3686 → Ξ − K S 0 Ω ¯ + + c . c and $$ {\mathcal{B}}_{\psi (3686)\to {\varOmega}^{-}{K}^{+}{\overline{\Xi}}^0+c.c} $$ B ψ 3686 → Ω − K + Ξ ¯ 0 + c . c is determined to be 1 . 05 ± 0 . 23 ± 0 . 14, which deviates from the isospin symmetry conservation predicted value of 0.5 by 2 . 1 σ .

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