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We propose an approach for measuring the moments of the hadronic invariantmass distribution in semileptonic $B_{s}^{0}$ meson decays using asum-of-exclusive technique. Using the present and foreseen knowledge aboutexclusive semileptonic $B_{s}^{0}$ decays, we estimate the uncertainties on thehadronic mass moments. Semileptonic $B_{s}^{0}$ decays can be described, astheir $B^{0}$ counterpart, using the Heavy Quark Expansion (HQE), with the onlydifference between the $B_{s}^{0}$ and $B^{0}$ mesons being the $SU(3)_F$breaking effects that change the numerical values of the non-perturbative HQEparameters. We extract the HQE parameters for the $B_{s}^{0}$ decays from ourestimates of the moments, showing the potential of the proposed method. Weidentify a set of required measurements for a future precision measurement.

Inclusive semileptonic $B_{s}^{0}$ meson decays at the LHC via a sum-of-exclusive modes technique: possibilities and prospects