Search for direct top squark pair production in final states with two leptons in √<i>s</i>=13 TeV <i>pp</i> collisions with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H
et al (show 2866 more authors) (2017) Search for direct top squark pair production in final states with two leptons in √<i>s</i>=13 TeV <i>pp</i> collisions with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 77 (12). 898-.

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Abstract

The results of a search for direct pair production of top squarks in events with two opposite-charge leptons (electrons or muons) are reported, using 36.1 fb - 1 of integrated luminosity from proton-proton collisions at s = 13 TeV collected by the ATLAS detector at the Large Hadron Collider. To cover a range of mass differences between the top squark t ~ and lighter supersymmetric particles, four possible decay modes of the top squark are targeted with dedicated selections: the decay t ~ → b χ ~ 1 ± into a <i>b</i>-quark and the lightest chargino with χ ~ 1 ± → W χ ~ 1 0 , the decay t ~ → t χ ~ 1 0 into an on-shell top quark and the lightest neutralino, the three-body decay t ~ → b W χ ~ 1 0 and the four-body decay t ~ → b ℓ ν χ ~ 1 0 . No significant excess of events is observed above the Standard Model background for any selection, and limits on top squarks are set as a function of the t ~ and χ ~ 1 0 masses. The results exclude at 95% confidence level t ~ masses up to about 720 GeV, extending the exclusion region of supersymmetric parameter space covered by previous searches.

Item Type: Article
Additional Information: 47 pages plus author list + cover pages (64 pages total), 11 figures, 19 tables, published version, all figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2016-17/
Uncontrolled Keywords: ATLAS Collaboration
Depositing User: Symplectic Admin
Date Deposited: 17 Jan 2018 07:54
Last Modified: 24 Jan 2024 13:12
DOI: 10.1140/epjc/s10052-017-5445-x
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3016209