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We report on a recent computation of the form factors in semi-leptonic decaysof the $\mathrm{B}_\mathrm{s}$ using Heavy Quark Effective Theory (HQET)formalism applied on the lattice. The connection of the form factors with the2-point and 3-point correlators on the lattice is explained, and the subsequentnon-perturbative renormalization of HQET and it's matching to $N_f=2$ QCD isoutlined. The results of the (static) leading-order calculation in thecontinuum limit is presented.

Form factors in the $\mathrm{B}_\mathrm{s} \rightarrow \mathrm{K} \ell \nu$ decays using HQET and the lattice