Proposal to study $B_s\to {\bar{D}}_{sJ}$ transitions

It is proposed to clear some of the puzzles of B decay to the broad ${\bar{D}}^{\ast \ast }$ states by studying the corresponding decay with strange states $B_s^0\to D_{s0}^{\ast -}{\pi }^{+}$ at LHCb. Interpretation of the results should be easier due to the narrowness of the $D_{s0}^{\ast -}$ state.