Search for long-lived particles using displaced vertices with low-momentum tracks in proton-proton collisions at s=13 TeV


Hayrapetyan A., Makarenko V., Tumasyan A., Adam W., Andrejkovic J., Benato L., ...More

Journal of High Energy Physics, vol.2026, no.5, 2026 (SCI-Expanded, Scopus)

  • Publication Type: Article / Article
  • Volume: 2026 Issue: 5
  • Publication Date: 2026
  • Doi Number: 10.1007/jhep05(2026)191
  • Journal Name: Journal of High Energy Physics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, INSPEC, MathSciNet, zbMATH, Directory of Open Access Journals, Academic Search Ultimate (EBSCO), Technology Collection (ProQuest)
  • Keywords: Beyond Standard Model, Hadron-Hadron Scattering, Lifetime, Supersymmetry
  • Hacettepe University Affiliated: Yes

Abstract

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 t~ NLSP model, the NLSP is a long-lived 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 t~ and bino-wino NLSP models.