New BaBar Results on Rare Leptonic B Decays

Abstract

New preliminary BaBar results for rare leptonic decays $B^{-}\to K^{-}\nu \bar{\nu }$ and $B^0\to {\ell }^{+}{\ell }^{-}$ are reported. Using data collected at the $\FourS$ with the BaBar detector, no evidence for a signal was found yielding the corresponding upper limits at the 90% confidence level: $\mathcal{B}(B^{-}\to K^{-}\nu \bar{\nu })<9.4\times 10^{-5}$ for $50.7 \invfb $, ${\cal B}(\bee)< \eeul$, ${\cal B}(\bmm) < \mmul$ and ${\cal B}(\bem) < \emul$ using $54.4 \invfb $.

Latex, 6 pages, 8 figs, two include files *.tex, contribution to FPCP conference replace: added references fixed typos