$B^{-}\to {\mu }^{-}{\bar{\nu }}_{\mu }\gamma$ and the Determination of $f_B$

Abstract

We compute the rate of the decay $B^{-}\to {\mu }^{-}{\bar{\nu }}_{\mu }\gamma$ by a QCD relativistic potential model, with the result: $\mathcal{B}(B^{-}\to {\mu }^{-}{\bar{\nu }}_{\mu }\gamma )=0.9\cdot 10^{-6}$. We also discuss how this decay mode can be used to access $f_B$.

Comments: LaTex file, 4 pages, 2 encapsulated PostScript figures. Talk given at the International Conference "Quark Confinement and the Hadron Spectrum II", Como 26-29 June 1996