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$\text{A study of }\Xi_b^- \text{ baryon and its excited state }\Xi_b^{*0} \text{ is reported using proton-proton collisions}$ data sample collected at $\sqrt{s} = 13$ TeV by the CMS experiment at the LHC in 2016-2018, corresponding to an integrated luminosity of $ 140 \; fb^{-1}$. $\Xi_b^-$ is reconstructed in $J/\psi \Xi^-$ channel $(J/\psi \longrightarrow \mu^+ \mu^-, \Xi^- \longrightarrow \Lambda \pi^-, \Lambda \longrightarrow p \pi^-$), and its excited state studied through decay to $\Xi_b^- \pi^+$, where pion is taken from primary vertex. More than 1000 signal events of $\Xi_b^-$ and up to 90 of $\Xi_b*^0$ are obtained, that are planned to be used for further search of new $\Xi_b$ states in $\Xi_b^- \pi^+$ and $\Xi_b^- \pi^+ \pi^-$ systems.
