First measurements of the branching fractions of $J/\psi \to {\Xi }^0\bar{\Lambda }{K}_S^0+c.c.$, $J/\psi \to {\Xi }^0{\bar{\Sigma }}^0{K}_S^0+c.c.$, and $J/\psi \to {\Xi }^0{\bar{\Sigma }}^{-}{K}^{+}+c.c.$

Abstract

By analyzing $(10087\pm 44)\times 10^6$ $J/\psi$ events collected with the BESIII detector at the BEPCII, the decays $J/\psi \to {\Xi }^0\bar{\Lambda }{K}_S^0+c.c.$, $J/\psi \to {\Xi }^0{\bar{\Sigma }}^0{K}_S^0+c.c.$, and $J/\psi \to {\Xi }^0{\bar{\Sigma }}^{-}{K}^{+}+c.c.$ are observed for the first time. Their branching fractions are determined to be $\mathcal{B}(J/\psi \to {\Xi }^0\bar{\Lambda }{K}_S^0+c.c.)=(3.76\pm 0.14\pm 0.23)\times 10^{-5}$, $\mathcal{B}(J/\psi \to {\Xi }^0{\bar{\Sigma }}^0{K}_S^0+c.c.)=(2.24\pm 0.32\pm 0.31)\times 10^{-5}$, and $\mathcal{B}(J/\psi \to {\Xi }^0{\bar{\Sigma }}^{-}{K}^{+}+c.c.)=(5.64\pm 0.17\pm 0.28)\times 10^{-5}$, where the first uncertainties are statistical and the second systematic.

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