Report

PUBDB-2024-07917

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Prospects for a search for direct pair production of top squarks at the high-luminosity LHC with the ATLAS detector

ATLAS Collaboration (Collaboration author)DESY*

2024

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Please use a persistent id in citations: doi:10.3204/PUBDB-2024-07917

Abstract: Prospects 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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Contributing Institute(s):

1. LHC/ATLAS Experiment (ATLAS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. LHC: ATLAS

Appears in the scientific report 2024

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