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We search for the $B^0\to p\bar{\Sigma}^0\pi^-$ decay with $\bar{\Sigma}^0\to \bar{\Lambda}\gamma$, where the $\gamma$ is not measured, using a datasample corresponding to an integrated luminosity of 711 $\rm{fb^{-1}}$ whichcontains 772 $\times$ $10^{6}$ $B\bar{B}$ pairs, collected around the$\Upsilon$(4S) resonance with the Belle detector at the KEKB asymmetric-energy$e^{+}e^{-}$ collider. We measure for the first time the $B^0\top\bar{\Sigma}^0\pi^-$ branching fraction to be $\mathcal{B}(B^0 \to p\bar\Sigma^0 \pi^-) = (1.17^{+0.43}_{-0.40}(\text{stat})\pm 0.07(\text{syst}))\times 10^{-6}$ with a significance of $3.0\sigma$. We simultaneously measurethe branching fraction for the related channel $B^{0}\to p\bar{\Lambda}\pi^{-}$with much improved precision.

Evidence for $B^0 \to p\bar{\Sigma}^0\pi^-$ at Belle