Search for the decays $B^0 \rightarrow D_s^{(*)+} a^-_{0(2)}$

We report on a search for the decays $B0 \rightarrow D^{(*)+}_s a^-_{0(2)}$ using 210~$fb^{-1}$ of data collected at the $\Upsilon(4S)$ resonance by the $BaBar$ detector. This measurement will reduce theoretical uncertainties in the estimate of the $CP$ asymmetry in $B \rightarrow D^{(*)+} a^-_{0(2)}$ decays, and also will give an additional insight into the decay mechanisms of other two-body decay modes of $B$ mesons, containing an open charm and a light meson in the final state.