Studies of Ξb Baryons Spectroscopy at the CMS Experiment

Recent results of studies of Ξ_b baryons properties and decays are discussed, based on the data collected by the CMS experiment at the LHC in proton collisions with 13 TeV energy in 2016–2018, corresponding to an integrated luminosity of \(140{\kern 1pt} {\kern 1pt} {\text{f}}{{{\text{b}}}^{{ - 1}}}{\kern 1pt} \). The CMS experiment reports the first observation of the new decay \(\Xi _{b}^{ - }\) → ψ(2S)Ξ^–, as well as the measurement of its branching fraction with respect to the known decay \(\Xi _{b}^{ - }\) → J/ψΞ^– . Precise measurements of the \(\Xi _{b}^{{*0}}\) baryon mass and natural width are also presented, with the ratio of the \(\Xi _{b}^{{*0}}\) and \(\Xi _{b}^{ - }\) production cross sections.