Angular analysis of $B^{+}\to {\rho }^{+}{\rho }^0$ decays reconstructed in 2019, 2020, and 2021 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +590

We report on a Belle II measurement of the branching fraction ($\mathcal{B}$), longitudinal polarization fraction ($f_L$), and CP asymmetry (${\mathcal{A}}_{CP}$) of $B^{+}\to {\rho }^{+}{\rho }^0$…