Measurement of the branching fractions of $B\to\eta' K$ decays using 2019/2020 Belle II data
Measurement of the branching fractions of $B\to\eta' K$ decays using 2019/2020 Belle II data
This note describes the rediscovery of $B\to\eta' K$ decays in Belle II data, both in the charged and neutral final state: $B_0\to\eta' K_S$ and $B^\pm\to\eta' K^\pm$. The $\eta'$ is searched for in two decay modes: $\eta'\to\eta\pi^+\pi^-$ with $\eta\to\gamma\gamma$, and $\eta'\to\rho\gamma$. The analysis uses data collected in 2019 and 2020 at …