CMS Collaboration2024-05-082024-05-082023CMS Collaboration. (2023). 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 s=13TeV<math><msqrt is="true"><mrow is="true"><mi is="true">s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after" is="true">=</mo><mn is="true">13</mn><mspace width="0.2em" is="true"></mspace><mtext is="true">TeV</mtext></math>. Physics Letters B, 846, 137713. https://doi.org/10.1016/j.physletb.2023.137713https://hdl.handle.net/1911/115644The first search is presented for vector-like leptons (VLLs) in the context of the “4321 model”, an ultraviolet-complete model with the potential to explain existing B physics measurements that are in tension with standard model predictions. The analyzed data, corresponding to an integrated luminosity of 96.5fb−1, were recorded in 2017 and 2018 with the CMS detector at the LHC in proton-proton collisions at s=13TeV. Final states with ≥3 b -tagged jets and two third-generation leptons (ττ, τντ, or ντντ) are considered. Upper limits are derived on the VLL production cross section in the VLL mass range 500–1050 GeV. The maximum likelihood fit prefers the presence of signal at the level of 2.8 standard deviations, for a representative VLL mass point of 600 GeV. As a consequence, the observed upper limits are approximately double the expected limits.engExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.Journal article1-s20-S0370269323000473-mainhttps://doi.org/10.1016/j.physletb.2023.137713