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Based on 58 million J/Psi events collected with the BESII detector at theBEPC, the baryon pair processes J/Psi to $\Sigma^+ \bar{\Sigma}^-$ and J/Psi to$\Xi^0 \bar{\Xi}^0$ are observed for the first time. The branching fractionsare measured to be ${\cal B}(J/Psi to \Sigma^+ \bar{\Sigma}^-)=(1.50\pm 0.10\pm0.22)\times 10^{-3}$ and ${\cal B}(J/Psi to \Xi^0 \bar{\Xi}^0)=(1.20\pm 0.12\pm0.21)\times 10^{-3}$, where the first errors are statistical and the secondones are systematic.

First measurements of J/Psi decays into $\Sigma^+ \bar{\Sigma}^-$ and $\Xi^0 \bar{\Xi}^0$