Padé approximants to $B\to \pi \ell {\nu }_{\ell }$ and $B_s\to K\ell {\nu }_{\ell }$ and determination of $|V_{ub}|$

Sergi Gonzàlez-Solís, Pere Masjuan, Camilo Rojas

In light of the first observation of the semileptonic decay $B_s^0\to K^{-}{\mu }^{+}{\nu }_{\mu }$ by the LHCb collaboration, we revisit the determination of the CKM parameter $|V_{ub}|$ fro…