  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.
