Search for new phenomena in events with two opposite-charge leptons, jets and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector

ATLAS Publications, T.M. Carter, M. Faucci Giannelli, A. Hasib, M.P. Heath, S. Palazzo, A. Søgaard, E.P. Takeva, A.J. Taylor, N. Themistokleous, E.M. Villhauer

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The results of a search for direct pair production of top squarks and for dark
matter in events with two opposite-charge leptons (electrons or muons), jets and missing transverse momentum are reported, using 139 fb−1 of integrated luminosity from proton-proton collisions at √s = 13 TeV, collected by the ATLAS detector at the Large Hadron Collider during Run 2 (2015–2018). This search considers the pair production of top squarks and is sensitive across a wide range of mass differences between the top squark and the lightest neutralino. Additionally, spin-0 mediator dark-matter models are considered, in
which the mediator is produced in association with a pair of top quarks. The mediator subsequently decays to a pair of dark-matter particles. No significant excess of events is observed above the Standard Model background, and limits are set at 95% confidence level. The results exclude top squark masses up to about 1 TeV, and masses of the lightest neutralino up to about 500 GeV. Limits on dark-matter production are set for scalar (pseudoscalar) mediator masses up to about 250 (300) GeV.
Original languageEnglish
Article number165
Pages (from-to)1-61
Number of pages61
Journal Journal of High Energy Physics
Volume4
DOIs
Publication statusPublished - 16 Apr 2021

Keywords / Materials (for Non-textual outputs)

  • Hadron-Hadron scattering (experiments)

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