Measurement of the branching fraction of $D_s^{+}\to {\ell }^{+}\hat{I}{½}_{\ell }$ via $e^{+}{e}^{-}\to D_s^{\ast +}{D}_s^{\ast -}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +640

Based on $10.64{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data taken at center-of-mass energies between 4.237 and 4.699 GeV with the BESIII detector, we study the leptonic $D_s^{+}$ de…