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

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  • ATLAS Collaboration
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Article number898
<mark>Journal publication date</mark>22/12/2017
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number12
Volume77
Number of pages41
<mark>State</mark>Published
<mark>Original language</mark>English

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~→bχ~±1 into a b-quark and the lightest chargino with χ~±1→Wχ~01, the decay t~→tχ~01 into an on-shell top quark and the lightest neutralino, the three-body decay t~→bWχ~01 and the four-body decay t~→bℓνχ~01. 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~01 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.

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EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0