The role of D⋆⋆ in B−→Ds+K−π−

The BaBar Collaboration has recently reported the observation of the decay mode B−→Ds+K−π−. We investigate the role played by the D⋆⋆ resonances in this decay mode using HQET. Although these resonances cannot appear as physical intermediate states in this reaction, their mass is very close to the Ds+K− production threshold and may, therefore, play a prominent role. We pursue this possibility to extract information on the properties of the strong D⋆⋆DM couplings. As a byproduct of this analysis we point out that future super-B factories may be able to measure the D00D⋆γ radiative coupling through the reaction B−→D⋆γπ−.