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

Abstract

A search for new long-lived particles decaying to leptons using proton?proton collision data produced by the CERN LHC at s?=13TeV 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 10cm 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 in the ee channel (e? and ?? channels). The search is designed to be sensitive to a wide range of models with displaced e? , ee , and ?? 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.