Lattice-Constrained Dispersive Bounds for ${\bar{B}}^0\to {\pi }^{+}{l}^{-}\bar{\nu }$ Decays

Abstract

I present a recent piece of work on semileptonic $B\to \pi$ decays in which lattice results and kinematical and dispersive constraints are combined to obtain model-independent bounds on the relevant form factors and rates.

Comments: LaTeX, 5 pages, 1 PostScript figure. Calls stwol.sty and epsf.sty. Talk given at the 28${}^{th}$ International Conference on High Energy Physics (ICHEP96), Warsaw, Poland, 25-31 July 1996. To appear in the proceedings