Predictions for Semileptonic Decays $\bar{B}\to D(D^{\ast })\pi \ell \bar{\nu }$ and Weak Radiative Decays of Bottom Hadrons

Hai-Yang Cheng

The semileptonic decays $\bar{B}\to D(D^{\ast })\pi \ell \bar{\nu }$ are analyzed by heavy quark and chiral symmetries. The branching ratio is of order of a few percent for $\dpi$, but it is much…