<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo stretchy="false">|</mml:mo><mml:msub><mml:mrow><mml:mi>V</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi><mml:mi>b</mml:mi></mml:mrow></mml:msub><mml:mo stretchy="false">|</mml:mo></mml:mrow></mml:math> , lepton flavor universality and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mi>U</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3</mml:mn><mml:msub…

In addition to the well-known $B\ensuremath{\rightarrow}{D}^{(*)}\ensuremath{\ell}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ decays, semileptonic ${B}_{s}\ensuremath{\rightarrow}{D}_{s}^{(*)}\ensuremath{\ell}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ processes offer possibility determine Cabibbo-Kobayashi-Maskawa matrix element $|{V}_{cb}|$. We implement dispersive approach describe hadronic form factors (FFs) for ${B}_{s}\ensuremath{\rightarrow}{D}_{s}^{(*)}$ transition in whole kinematical range, starting from recent lattice QCD computations at large values of four-momentum transfer. extract $|{V}_{cb}|$ experimental data, obtaining $|{V}_{cb}|\ifmmode\times\else\texttimes\fi{}{10}^{3}=(41.7\ifmmode\pm\else\textpm\fi{}1.9)$ ${B}_{s}\ensuremath{\rightarrow}{D}_{s}\ensuremath{\ell}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ and $|{V}_{cb}|\ifmmode\times\else\texttimes\fi{}{10}^{3}=(40.7\ifmmode\pm\else\textpm\fi{}2.4)$ ${B}_{s}\ensuremath{\rightarrow}{D}_{s}^{*}\ensuremath{\ell}{\ensuremath{\nu}}_{\ensuremath{\ell}}$ decays. After averaging with obtained $B\ensuremath{\rightarrow}{D}^{(*)}$ channels [G. Martinelli et al., Phys. Rev. D 105, 034503 (2022); G. arXiv:2109.15248.], we get $|{V}_{cb}|\ifmmode\times\else\texttimes\fi{}{10}^{3}=(41.2\ifmmode\pm\else\textpm\fi{}0.8)$, which is compatible most inclusive estimate $|{V}_{cb}{|}_{\mathrm{incl}}\ifmmode\times\else\texttimes\fi{}{10}^{3}=42.16\ifmmode\pm\else\textpm\fi{}0.50$ [M. Bordone Lett. B 822, 136679 (2021).] $1\ensuremath{\sigma}$ level. test lepton flavor universality by computing $\ensuremath{\tau}/\ensuremath{\ell}$ ratios total decay rates (where $\ensuremath{\ell}$ a light lepton), $R({D}_{s})=0.298(5)$ $R({D}_{s}^{*})=0.250(6)$. also address issue $SU(3{)}_{F}$ symmetry breaking comparing FFs entering channels.