# Observation of an Excited ${\Omega }^{-}$ Baryon

02 August 2018

Abstract: Using data recorded with the Belle detector, we observe a new excited hyperon, an ${\Omega }^{*-}$ candidate decaying into ${\Xi }^{0}{K}^{-}$ and ${\Xi }^{-}{K}_{S}^{0}$ with a mass of $2012.4±0.7\left(\text{stat}\right)±0.6\left(\text{syst}\right)\text{}\text{}\mathrm{MeV}/{c}^{2}$ and a width of $\Gamma =6.{4}_{-2.0}^{+2.5}\left(\mathrm{stat}\right)±1.6\left(\mathrm{syst}\right)\text{}\text{}\mathrm{MeV}$. The ${\Omega }^{*-}$ is seen primarily in $\Upsilon \left(1S\right),\Upsilon \left(2S\right)$, and $\Upsilon \left(3S\right)$ decays.

Published in: Physical Review Letters 121 (2018)