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000619812 0247_ $$2datacite_doi$$a10.3204/PUBDB-2024-07917
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000619812 1001_ $$0P:(DE-HGF)0$$aATLAS Collaboration$$b0$$eCollaboration author
000619812 245__ $$aProspects for a search for direct pair production of top squarks at the high-luminosity LHC with the ATLAS detector
000619812 260__ $$c2024
000619812 300__ $$a26
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000619812 520__ $$aProspects for a future search for direct pair production of top squarks (stop) in events with two opposite-charge leptons (electrons or muons), jets and missing transverse momentum at the HL-LHC are investigated in this note. The region of small mass-splitting between the stop and the lightest neutralino Δm(~t1,~χ01), where the stop proceeds through a four-body or three-body decay, without the presence of an on-shell top quark, is studied, and finally the analysis is also applied to the two-body decay region, where Δm(~t1,~χ01)>m(t). The analysis builds on a similar search, in this final state, published using 139 fb−1 of integrated luminosity from proton--proton collisions at √s = 13 TeV collected by the ATLAS detector during Run 2. The potential discovery reach and the 95\% CL exclusion limits for √s =14 TeV and an integrated luminosity of 3000 fb−1 are presented. In the four-body decay region the discovery sensitivity with a 5σ significance extends up to m(~t1) of about 380 GeV for Δm(~t1,~χ01) of about 65 GeV and reaches about 480 GeV for Δm(~t1,~χ01) of about 25 GeV. The discovery potential at 5σ extends up to stop masses of about 660 GeV for a ~χ01 mass of about 490 GeV in the three-body decay region and up to about 810 GeV for a massless ~χ01 in the two-body decay region. The 95\% CL exclusion limit extends up to m(~t1) of about 690 GeV, for a ~χ01 mass of about 660 GeV in the four-body decay region, up to m(~t1) of about 850 GeV for a ~χ01 mass of about 680 GeV in the three-body decay region and up to m(~t1) of about 1010 GeV for a massless ~χ01 in the two-body decay region, covering a significant region beyond the current limits.
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