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@TECHREPORT{Collaboration:619812,
key = {619812},
collaboration = {{ATLAS Collaboration}},
title = {{P}rospects for a search for direct pair production of top
squarks at the high-luminosity {LHC} with the {ATLAS}
detector},
reportid = {PUBDB-2024-07917},
pages = {26},
year = {2024},
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.},
cin = {ATLAS},
cid = {I:(DE-H253)ATLAS-20120731},
pnm = {611 - Fundamental Particles and Forces (POF4-611)},
pid = {G:(DE-HGF)POF4-611},
experiment = {EXP:(DE-H253)LHC-Exp-ATLAS-20150101},
typ = {PUB:(DE-HGF)29},
doi = {10.3204/PUBDB-2024-07917},
url = {https://bib-pubdb1.desy.de/record/619812},
}