Measurement of the branching fractions of $B\to {\eta }^{\prime }K$ decays using 2019/2020 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +545

This note describes the rediscovery of $B\to {\eta }^{\prime }K$ decays in Belle II data, both in the charged and neutral final state: $B_0\to {\eta }^{\prime }{K}_S$ and $B^{\pm }\to {\eta }^{\prime }{K}^{\pm }$. The ${\eta }^{\prime }$ is searched…