The role of $D^{\star \star }$ in $B^{-}\to D_s^{+}{K}^{-}{\pi }^{-}$

Abstract

The BaBar collaboration has recently reported the observation of the decay mode $B^{-}\to D_s^{+}{K}^{-}{\pi }^{-}$. We investigate the role played by the $D^{\star \star }$ 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 $D^{\star \star }DM$ couplings. As a byproduct of this analysis we point out that future super-$B$ factories may be able to measure the $D_0^0{D}^{\star }\gamma$ radiative coupling through the reaction $B^{-}\to D^{\star }\gamma {\pi }^{-}$.

arXiv commentVersion to appear in Physics Letters B

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Cited by in corpus (4)

• Two-pole structure of the $D_0^{\ast }(2400)$
• Observation of tree-level B decays with $s\bar{s}$ Production from Gluon Radiation
• Measurement of $B\to D_s^{(\ast )}K\pi$ branching fractions
• Measurement of $B^0\to D_s^{-}{K}_S^0{\pi }^{+}$ and $B^{+}\to D_s^{-}{K}^{+}{K}^{+}$ branching fractions