Search for long-lived particles using displaced vertices with low-momentum tracks in proton-proton collisions at $$ sqrt{s}=13 $$ TeV
Journal Article
Overview
abstract
; A; bstract; ; ; A search for long-lived particles using final states including a displaced vertex with low-momentum tracks, large missing transverse momentum, and a jet from initial-state radiation is presented. This search uses proton-proton collision data at a center-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC in 2017 and 2018, with a total integrated luminosity of 100 fb; ; −; 1; ; . This analysis adopts specific supersymmetric (SUSY) coannihilation scenarios as benchmark signal models, characterized by a next-to-lightest SUSY particle (NLSP) with a mass difference of less than 25 GeV relative to the lightest SUSY particle, assumed to be a bino-like neutralino. In the top squark; ; ; $$ left(overset{sim }{mathrm{t}}right) $$; ; ; ; t; ~; ; ; ; ; ; NLSP model, the NLSP is a long-lived; ; ; $$ overset{sim }{mathrm{t}} $$; ; ; t; ~; ; ; ; ; , while in the bino-wino NLSP scenario, the mass-degenerate NLSPs are a wino-like long-lived neutralino and a short-lived chargino. The search excludes top squarks with masses less than 400–1100 GeV and wino-like neutralinos with masses less than 220–550 GeV, depending on the signal parameters, including the mass difference, mass, and lifetime of the long-lived particle. It sets the most stringent limits to date for the; ; ; $$ overset{sim }{mathrm{t}} $$; ; ; t; ~; ; ; ; ; and bino-wino NLSP models.;
