First Experimental Study of the Purely Leptonic Decay $D_s^{\ast +}\to e^{+}{\nu }_e$

BESIII Collaboration, M. Ablikim, M. N. Achasov +615

Using $7.33{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data taken with the BESIII detector at the BEPCII collider, we report the first experimental study of the purely leptonic decay…