Probing stops in the coannihilation region at the HL-LHC: a comparative study of different processes

Abstract

In the minimal supersymmetric model, the coannihilation of the lighter stop ${\tilde{t}}_1$ and bino-like dark matter $\chi$ provides a feasible way to accommodate the correct dark matter relic abundance. In this scenario, due to the compressed masses, ${\tilde{t}}_1$ merely appears as missing energy at the LHC and thus the pair production of ${\tilde{t}}_1$ can only be probed by requiring an associated energetic jet. Meanwhile, since ${\tilde{t}}_2$ and ${\tilde{b}}_1$ are correlated in mass and mixing with ${\tilde{t}}_1$, the production of ${\tilde{t}}_2{\tilde{t}}_2^{\ast }$ or ${\tilde{b}}_1{\tilde{b}}_1^{\ast }$, each of which dominantly decays into ${\tilde{t}}_1$ plus $Z$, $h$ or $W$ boson, may serve as a complementary probe. We examine all these processes at the HL-LHC and find that the $2\sigma$ sensitivity to $\chi$ mass can be as large as about 570 GeV, 600 GeV and 1.1 TeV from the production process of ${\tilde{t}}_1{\tilde{t}}_1^{\ast }+\mathrm{jet}$, ${\tilde{t}}_2{\tilde{t}}_2^{\ast }$ and ${\tilde{b}}_1{\tilde{b}}_1^{\ast }$, respectively.

arXiv comment16 pages,9 figures

References in corpus (39)

• Planck 2015 results. XIII. Cosmological parameters
• Dark Matter Results From 54-Ton-Day Exposure of PandaX-II Experiment
• First Dark Matter Search Results from the XENON1T Experiment
• SuSpect: a Fortran Code for the Supersymmetric and Higgs Particle Spectrum in the MSSM
• Combined results of searches for the standard model Higgs boson in pp collisions at sqrt(s) = 7 TeV
• Combined search for the Standard Model Higgs boson using up to 4.9 fb-1 of pp collision data at sqrt(s) = 7 TeV with the ATLAS detector at the LHC
• SDECAY: a Fortran code for the decays of the supersymmetric particles in the MSSM
• Limits on spin-dependent WIMP-nucleon cross section obtained from the complete LUX exposure
• Neutralino Dark Matter at 14 and 100 TeV
• Decays of the Lightest Top Squark
• The light stop window
• Light Stop Searches at the LHC with Monojet Events
• Closing the stop gap
• Supervised deep learning in high energy phenomenology: a mini review
• Muon $g-2$ and Dark Matter in the MSSM
• Opening up the compressed region of stop searches at 13 TeV LHC
• Three-Body Decays of Top and Bottom Squarks
• Collider limits on new physics within micrOMEGAs4.3
• SUSY-QCD corrections to stop and sbottom decays into Higgs bosons
• Stop on Top
• Closing up a light stop window in natural SUSY at LHC
• The Reach of the High-Energy LHC for Gluinos and Top Squarks in SUSY Models with Light Higgsinos
• Search for supersymmetry in final states with charm jets and missing transverse momentum in 13 TeV $pp$ collisions with the ATLAS detector
• Four Body Decay of the Stop Squark at the Upgraded Tevatron
• Detecting light stop pairs in coannihilation scenarios at the LHC
• Natural Supersymmetry without Light Higgsinos
• Top-squark in natural SUSY under current LHC run-2 data
• Single top squark production as a probe of natural supersymmetry at the LHC
• A top-squark hunter's guide
• SUSY-QCD corrections to stop and sbottom decays into W and Z bosons
• The FCNC top-squark decay as a probe of squark mixing
• Sneaky light stop
• ATLAS Z-peaked excess in MSSM with a light sbottom or stop
• Boosted di-boson from a mixed heavy stop
• Search for top squarks decaying via four-body or chargino-mediated modes in single-lepton final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Stop Co-Annihilation in the Minimal Supersymmetric Standard Model Revisited
• Tagging a mono-top signature in Natural SUSY
• Polarization of top and chargino from stop decay in natural SUSY
• Uncover Compressed Supersymmetry via Boosted Bosons from the Heavier Stop/Sbottom