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

Belle II collaboration, F. Abudinén, I. Adachi +549

We report on the first Belle II measurement of the branching fraction ($\mathcal{B}$) and longitudinal polarization fraction ($f_L$) of $B^{+}\to {\rho }^{+}{\rho }^0$ decays. We reconstruct $B^+\…