Measurement of the absolute branching fraction for ${\Lambda }_c^{+}\to \Lambda e^{+}{\nu }_e$

BESIII Collaboration, M. Ablikim, M. N. Achasov +65

We report the first absolute measurement of the branching fraction of ${\Lambda }_c^{+}\to \Lambda e^{+}{\nu }_e$. This measurement is based on 567 pb${}^{-1}$ of $e^{+}{e}^{-}$ annihilation data produce…