Evidence for Two Excited Ω^{-} Hyperons

Using e^{+}e^{-} collision data corresponding to an integrated luminosity of 19  fb^{-1} collected by the BESIII detector at center-of-mass energies ranging from 4.13 to 4.70 GeV, we report the first evidence for a new excited Ω^{-} hyperon, the Ω(2109)^{-}, through the process e^{+}e^{-}→Ω(2109)^{-}Ω[over ¯]^{+}+c.  c. with a significance of 4.1σ. The mass and width of Ω(2109)^{-} are measured to be 2108.5±5.2_{stat}±0.9_{syst}  MeV/c^{2} and 18.3±16.4_{stat}±5.7_{syst}  MeV, respectively. We also present evidence for a new production mechanism for the previously identified Ω(2012)^{-} via the process e^{+}e^{-}→Ω(2012)^{-}Ω[over ¯]^{+}+c.  c. with a significance of 3.5σ.