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A study of excited $\Lambda_\mathrm{b}^0$ baryons is reported, based on adata sample collected in 2016-2018 with the CMS detector at the LHC inproton-proton collisions at a center-of-mass energy of 13 TeV, corresponding toan integrated luminosity of up to 140 fb$^{-1}$. The existence of four excited$\Lambda_\mathrm{b}^0$ states: $\Lambda_\mathrm{b}$(5912)$^0$,$\Lambda_\mathrm{b}$(5920)$^0$, $\Lambda_\mathrm{b}$(6146)$^0$, and$\Lambda_\mathrm{b}$(6152)$^0$ in the $\Lambda_\mathrm{b}^0\pi^+\pi^-$ massspectrum is confirmed, and their masses are measured. The$\Lambda_\mathrm{b}^0\pi^+\pi^-$ mass distribution exhibits a broad excess ofevents in the region of 6040-6100 MeV, whose origin cannot be discerned withthe present data.

Study of excited $\Lambda_\mathrm{b}^0$ states decaying to $\Lambda_\mathrm{b}^0\pi^+\pi^-$ in proton-proton collisions at $\sqrt{s} =$ 13 TeV