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We report on a two-flavor lattice QCD estimate of the $B_s$ and $B^*_s$leptonic decays parameterized by the decay constants $f_{B_s}$ and $f_{B^*_s}$.In addition to their relevance for phenomenology, their extraction has allowedus to investigate whether the "step scaling in mass" strategy is suitable withWlilson-Clover fermions to smoothly extrapolate quantities of the heavy-strangesector up to the bottom scale. From the central value of $f_{D_s}$ quoted byFLAG at $N_f=2$ and our ratio $\frac{f_{B_s}}{f_{D_s}}$, we obtain$f_{B_s}=215(10)(2)(^{+2}_{-5})$ MeV and$f_{B^*_s}/f_{B_s}=1.02(2)(^{+2}_{-0})$.

Decay constant of $B_s$ and $B^*_s$ mesons from ${\rm N_f}=2$ lattice QCD}