Search for long-lived particles decaying to leptons with large impact parameter in proton–proton collisions at √s = 13\,TeV

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A search for new long-lived particles decaying to leptons using proton–proton collision data produced by the CERN LHC at √s=13\,TeV s = 13 Te is presented. Events are selected with two leptons (an electron and a muon, two electrons, or two muons) that both have transverse impact parameter values between 0.01 and 10 \,cm cm and are not required to form a common vertex. Data used for the analysis were collected with the CMS detector in 2016, 2017, and 2018, and correspond to an integrated luminosity of 118 (113) \,fb⁻¹ fb - 1 in the e_^ e_^ e e channel ( e_^ e μ and μ μ channels). The search is designed to be sensitive to a wide range of models with displaced e_^ e μ , e_^ e_^ e e , and μ μ final states. The results constrain several well-motivated models involving new long-lived particles that decay to displaced leptons. For some areas of the available phase space, these are the most stringent constraints to date.