First observation of Bs -> D_{s2}^{*+} X mu nu decays

LHCb Collaboration, R. Aaij, B. Adeva +586

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays Bs -> Ds+ X mu nu and Bs -> D0 K+ X mu nu are d…