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 data sample corresponding to an integrated luminosity of 711 $\rm{ fb^{ -1}}$ which contains 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 $B^0\to p\bar{ \Sigma}^0\pi^-$ 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 measure the branching fraction for the related channel $B^{ 0}\to p\bar{ \Lambda}\pi^{ -}$ with much improved precision.
Categories: hep-ex