Observation of New Structure in the $e^{+}{e}^{-}$ Cross Section above the $\Upsilon \mathrm{}\left(4S\right)\mathrm{}$

Measurements of the $e^{+}{e}^{-}$ cross section above $B\overline{B}$ threshold are reported. Structures are observed which could be the $\Upsilon \mathrm{}\left(5S\right)\mathrm{}$ and $\Upsilon \mathrm{}\left(6S\right)\mathrm{}$ resonances. The masses and widths are given and compared with various potential-model predictions. Average charged multiplicities and inclusive lepton yields are also presented.