The Exclusive Decay $B\to \rho e\nu$ Beyond Model Calculations

Abstract

Due to its comparatively theoretical ``simplicity'', the decay channel $B\to \rho e\nu$ offers one of the best possibilities to determine the CKM matrix element $|V_{ub}|$ accurately. I present a new calculation of the relevant hadronic form factors from light-cone sum rules. I also review the results from lattice calculations and find that they agree with the results from light-cone sum rules where comparison is possible.\\ This paper relies on work done in collaboration with V.M.\ Braun.

6 pages + titlepage, latex2e, requires a4wide.sty and epsf.sty, 3 postscript figures included, Talk given at XXXIth Rencontres de Moriond, Electroweak Session, Les Arcs 1800 (France), March 96