Semileptonic $B_s$ decay measurements at LHCb

I discuss the first semileptonic $B_s$ decay measurements performed at LHCb, and the prospects for precise studies of $B_s$ semileptonic decay properties. The analyses covered here are based on data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV. In particular the semileptonic decays $\text{Bs}\to D_s^{+}X\text{munu}$ and $\text{Bs}\to D^0{K}^{+}X\text{munu}$ are studied. Two structures are observed in the $D^0{K}^{+}$ mass spectrum at masses consistent with the known $D_{s1}(2536{)}^{+}$ and $D_{s2}^{\ast }(2573{)}^{+}$ mesons. The measured branching fractions relative to the total $\text{Bs}$ semileptonic rate are ${{\cal{B}}(\Bs\to D_{s2}^{*+} X \munu)}/{{\cal{B}}(\Bs\to X \munu)}= (3.3\pm 1.0\pm 0.4)%$,and${{\cal{B}}(\Bs\to D_{s1}^+ X \munu)}/{{\cal{B}}(\Bs\to X \munu)}= (5.4\pm 1.2({\rm stat})\pm 0.5({\rm sys}))%$. This is the first observation of the $D_{s2}^{\ast +}$ state in $\text{Bs}$ decays.