Anatomy of Coannihilation with a Scalar Top Partner

Abstract

We investigate a simplified model of dark matter where a Majorana fermion $\chi$ coannihilates with a colored scalar top partner $\tilde{t}$. We explore the cosmological history, with particular emphasis on the most relevant low-energy parameters: the mass splitting between the dark matter and the coannihilator, and the Yukawa coupling $y_{\chi }$ that connects these fields to the Standard Model top quarks. We also allow a free quartic coupling ${\lambda }_h$ between a pair of Higgs bosons and $\tilde{t}$ pairs. We pay special attention to the case where the values take on those expected where $\tilde{t}$ corresponds to the superpartner of the right-handed top, and $\chi$ is a bino. Direct detection, indirect detection, and colliders are complementary probes of this simple model.

36 pages, 8 figures

References in corpus (22)

• A Theory of Dark Matter
• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• The Well-Tempered Neutralino
• Background model systematics for the Fermi GeV excess
• A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
• Neutralino Dark Matter at 14 and 100 TeV
• Search for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios in $pp$ collisions at $\sqrt{s}=8$TeV with the ATLAS detector
• Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in $\sqrt{s}=$ 8 TeV pp collisions with the ATLAS detector
• Search for direct top-squark pair production in final states with two leptons in pp collisions at sqrt(s)=8TeV with the ATLAS detector
• WIMPs at the Galactic Center
• Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• The Extent of the Stop Coannihilation Strip
• Majorana Dark Matter with a Coloured Mediator: Collider vs Direct and Indirect Searches
• The number density of a charged relic
• Sommerfeld corrections to type-II and III leptogenesis
• Neutralino-stop co-annihilation into electroweak gauge and Higgs bosons at one loop
• Signatures of Top Flavored Dark Matter
• One-loop corrections to neutralino-stop coannihilation revisited
• SUSY-QCD corrections to stop annihilation into electroweak final states including Coulomb enhancement effects
• Radiative corrections to co-annihilation processes
• Closing in on mass-degenerate dark matter scenarios with antiprotons and direct detection
• Dark Matter on Top

Cited by in corpus (22)

• Signatures of Majorana dark matter with t-channel mediators
• Lyman-$\alpha$ constraints on freeze-in and superWIMPs
• On thermal corrections to near-threshold annihilation
• Bound-state effects on dark matter coannihilation: Pushing the boundaries of conversion-driven freeze-out
• Higgs-mediated bound states in dark-matter models
• Superstring-Inspired Particle Cosmology: Inflation, Neutrino Masses, Leptogenesis, Dark Matter & the SUSY Scale
• Forbidden Dark Matter at the Weak Scale via the Top Portal
• Impact of Sommerfeld Effect and Bound State Formation in Simplified $t$-Channel Dark Matter Models
• Flipped SU(5) GUT Phenomenology: Proton Decay and $g_{\mu }-2$
• Excited bound states and their role in dark matter production
• The CMSSM Survives Planck, the LHC, LUX-ZEPLIN, Fermi-LAT, H.E.S.S. and IceCube
• Stop Co-Annihilation in the Minimal Supersymmetric Standard Model Revisited
• Impact of bound states on non-thermal dark matter production
• Non-perturbative effects for dark sectors with QCD portals
• Quantifying Limits on CP Violating Phases from EDMs in Supersymmetry
• t-channel dark matter at the LHC -- a whitepaper
• Probing Bino-Gluino Coannihilation at the LHC
• A Minimal Supersymmetric SU(5) Missing-Partner Model
• A Study of Dark Matter and QCD-Charged Mediators in the Quasi-Degenerate Regime
• Exploring Uncharted Soft Displaced Vertices in Open Data
• Dark Matter EFT, the Third -- Neutrino WIMPs
• Dark matter properties implied by gamma ray interstellar emission models