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


Aad, G ORCID: 0000-0002-6665-4934, Abbott, B ORCID: 0000-0002-5888-2734, Abbott, DC ORCID: 0000-0002-7248-3203, Abed Abud, A ORCID: 0000-0002-2788-3822, Abeling, K ORCID: 0000-0002-1002-1652, Abhayasinghe, DK ORCID: 0000-0002-2987-4006, Abidi, SH ORCID: 0000-0002-8496-9294, AbouZeid, OS ORCID: 0000-0002-8279-9324, Abraham, NL, Abramowicz, H ORCID: 0000-0001-5329-6640 et al (show 90 more authors) (2021) 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 Journal of High Energy Physics, 2021 (4). 165-. ISSN 1029-8479, 1029-8479

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Abstract

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. [Figure not available: see fulltext.]

Item Type: Article
Additional Information: 65 pages in total, author list starting page 49, 15 figures, 19 tables, published in JHEP. All figures, including auxiliary figures, are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2018-08/
Uncontrolled Keywords: Hadron-Hadron scattering (experiments)
Divisions: Faculty of Science & Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 11 May 2021 07:46
Last Modified: 21 Apr 2026 23:20
DOI: 10.1007/JHEP04(2021)165
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3122199
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