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 $\bar{B}\to D(D^{\ast })\pi \ell \bar{\nu }$ by heavy quark and chiral symmetry. The branching ratio for $\bar{B}\to D\pi \ell \bar{\nu }$ is quite significant, as big as $(0.5-1)\%$. The branching ratio for $\bar{B}\to D^{\ast }\pi \ell \bar{\nu }$ 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 $D^{\ast }$. We also study the parity-violation effects on the decay rates for different polarization states of the $D^{\ast }$. Figures may be obtained by anonymous FTP from strange.tn.cornell.edu in the directory pub/CLNS931204, or by email from the author.

Comments: 28 pages, 23 figs (FTP from author), LaTeX, Typos corrected in Eq. 4.9c (factor of 2), Eq. A.4, and Tables II & III. No change in content, results, or figures. CLNS93/1204, IP-ASTP-15-93