Heavy Quark and Chiral Symmetry Predictions for Semileptonic Decays B->D(D*),pi,l,nu

Abstract

We study in detail the prediction for the semileptonic decays $\bar{B} \to D (D^*) π\ell \barν$ by heavy quark and chiral symmetry. The branching ratio for $\bar{B} \to D π\ell \barν$ is quite significant, as big as $(0.5-1)\%$. The branching ratio for $\bar{B} \to D^* π\ell \barν$ is only of order $10^{-4}-10^{-5}$. Numerical results for various single particle spectra and their dependence on the pion momentum cutoff schemes are presented in a series of figures, as are the model independent ratios for differential rates of $D$ and $D^*$. We also study the parity-violation effects on the decay rates for different polarization states of the $D^*$. Figures may be obtained by anonymous FTP from strange.tn.cornell.edu in the directory pub/CLNS931204, or by email from the author.