The role of D{star operator} {star operator} in B- → Ds + K- π-

The BaBar Collaboration has recently reported the observation of the decay mode B^- → D_s ⁺ K^- π^-. We investigate the role played by the D^{{star operator} {star operator}} 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 D_s ⁺ K^- production threshold and may, therefore, play a prominent role. We pursue this possibility to extract information on the properties of the strong D^{{star operator} {star operator}} D M couplings. As a byproduct of this analysis we point out that future super-B factories may be able to measure the D₀ ⁰ D^{{star operator}} γ radiative coupling through the reaction B^- → D^{{star operator}} γ π^-.