Measurement of the branching fraction for $B^0\to {\pi }^0{\pi }^0$ decays reconstructed in 2019-2020 Belle II data

Belle II Collaboration, F. Abudinén, I. Adachi +551

We report the first reconstruction of the $B^0\to {\pi }^0{\pi }^0$ decay mode at Belle II using samples of 2019 and 2020 data that correspond to 62.8 fb${}^{-1}$ of integrated luminos…