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The first observation of the decays $J\!/\!\psi \rightarrow \bar{p}\Sigma^{+} K_{S}^{0}$ and $J\!/\!\psi \rightarrow p \bar{\Sigma}^{-} K_{S}^{0}$is reported using $(10087\pm44)\times10^{6}$ $J\!/\!\psi$ events recorded bythe BESIII detector at the BEPCII storage ring. The branching fractions of eachchannel are determined to be $\mathcal{B}(J\!/\!\psi \rightarrow \bar{p}\Sigma^{+} K_{S}^{0})=(1.361 \pm 0.006 \pm 0.025) \times 10^{-4}$ and$\mathcal{B}(J\!/\!\psi \rightarrow p \bar{\Sigma}^{-} K_{S}^{0})=(1.352 \pm0.006 \pm 0.025) \times 10^{-4}$. The combined result is$\mathcal{B}(J\!/\!\psi \rightarrow \bar{p} \Sigma^{+} K_{S}^{0} +c.c.)=(2.725\pm 0.009 \pm 0.050) \times 10^{-4}$, where the first uncertainty isstatistical and the second systematic. The results presented are in goodagreement with the branching fractions of the isospin partner decay $J\!/\!\psi\rightarrow p K^- \bar\Sigma^0 + c.c.$.

Observation and branching fraction measurement of the decay $J\!/\!\psi \rightarrow \bar{p} \Sigma^{+} K_{S}^{0} + c.c.$