Measurements of the branching fractions for the semi-leptonic decays $D_s^{+}\to \varphi e^{+}{\nu }_e$, $\varphi {\mu }^{+}{\nu }_{\mu }$, $\eta {\mu }^{+}{\nu }_{\mu }$ and ${\eta }^{\prime }{\mu }^{+}{\nu }_{\mu }$

M. Ablikim, M. N. Achasov, S. Ahmed +439

By analyzing 482 pb${}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at the center-of-mass energy $\sqrt{s}=4.009$ GeV with the BESIII detector, we measure the %absolute branching fracti…