Observation of the $ \mathrm{\Omega }(2012)$ baryon at the LHC

A signal consistent with the $ \mathrm{\Omega }(2012)$ baryon has been observed with a significance of $ 15\sigma $ in pp collisions at $ \sqrt{s}=13\text{}\text{}\mathrm{TeV}$ at the LHC. In this paper, the analysis technique is described and measurements of the mass and width of the $ \mathrm{\Omega }(2012)$ are reported, along with the first measurement of its transverse-momentum spectrum and yield. This paper corroborates the observation by the Belle Collaboration of this excited $ \mathrm{\Omega }$ state and the observation that the $ \mathrm{\Omega }(2012)$ has a rather narrow width for a strongly decaying resonance. The yield measurement is combined with a statistical thermal model calculation of strange baryon yield ratios to obtain estimates of the $ \mathrm{\Omega }(2012{)}^{-}\to \mathrm{\Xi }\overline{\mathrm{K}}$ branching ratios. These results will improve our understanding of the internal structure and mass spectrum of excited baryon states and serve as a baseline for searches regarding modifications of these properties in high-temperature media.