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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},
}