Taming the long distance effects in the $D_s^{+}\to {\pi }^{+}{\ell }^{-}{\ell }^{+}$ decay

Marxil Sánchez, Genaro Toledo, I. Heredia De La Cruz

The semileptonic decay $D_s^{+}\to {\pi }^{+}{\ell }^{-}{\ell }^{+}$, where $\ell =e,\mu$, is used as a reference channel when looking for suppressed or forbidden processes of the s…