Total Width and Leptonic Branching Ratio of theϒ(9.46)

With use of the LENA detector at the DORIS $e^{+}{e}^{-}$ storage ring, the hadronic cross section and the $\mu$-pair decay branching ratio of the $\Upsilon \mathrm{}\left(9.46\right)\mathrm{}$ resonance have been measured. ${\Gamma }_{\mathrm{ee}}=1.23\mathrm{}\pm 0.10 (\pm 0.14)$ keV, $B_{\mu \mu }=[3.5\mathrm{}\pm 1.4 (\pm 0.4\left)\right]$%, and ${\Gamma }_{\mathrm{tot}}={35}_{-10\mathrm{}}^{+25\mathrm{}} \left(\{+9\mathrm{}\}\{-7\mathrm{}\}\right)$ keV have been obtained. The first set of errors gives the statistical uncertainty. The numbers in parentheses represent systematic errors arising from the uncertainty in the total hadronic cross section.