Measurement of the Branching Fraction for B$_{s} \rightarrow D_{s1}^{\pm}$(2536) $\mu \nu X\:$ at D\O

The orbitally excited charm state ${D}_{s1}^{\pm}(2536)$ has been observed at D\O\ in the decay channel ${B}_{s} \rightarrow {D}_{s1}^{\pm}(2536) \mu \nu {X} \:$ with ${D}_{s1}^{\pm}(2536) \rightarrow {D}^{* \pm} K^0_S \:$. The ${D}_{s1}^{\pm}(2536)\:$ mass peak is presented with a signal significance of greater than 5.0$\sigma$ and the branching fraction for the semileptonic decay to this state is measured in approximately 1~fb$^{-1}$ of data.