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The first search is presented for vector-like leptons (VLLs) in the contextof the "4321 model", an ultraviolet-complete model with the potential toexplain existing B physics measurements that are in tension with standard modelpredictions. The analyzed data, corresponding to an integrated luminosity of96.5 fb$^{-1}$, were recorded in 2017 and 2018 with the CMS detector at the LHCin proton-proton collisions at $\sqrt{s}$ = 13 TeV. Final states with ${\geq}$3 b-tagged jets and two third-generation leptons ($\tau\tau$, $\tau\nu_\tau$,or $\nu_\tau\nu_\tau$) are considered. Upper limits are derived on the VLLproduction cross section in the VLL mass range 500-1050 GeV. The maximumlikelihood fit prefers the presence of signal at the level of 2.8 standarddeviations, for a representative VLL mass point of 600 GeV. As a consequence,the observed upper limits are approximately double the expected limits.

physics letters. b

Search for pair-produced vector-like leptons in final states with  third-generation leptons and at least three b quark jets in proton-proton  collisions at $\sqrt{s}$ = 13 TeV