Scalar Electroweak Multiplet Dark Matter

Abstract

We revisit the theory and phenomenology of scalar electroweak multiplet thermal dark matter. We derive the most general, renormalizable scalar potential, assuming the presence of the Standard Model Higgs doublet, $H$, and an electroweak multiplet $\Phi$ of arbitrary SU(2${)}_L$ rank and hypercharge, $Y$. We show that, in general, the $\Phi$-$H$ Higgs portal interactions depend on three, rather than two independent couplings as has been previously considered in the literature. For the phenomenologically viable case of $Y=0$ multiplets, we focus on the septuplet and quintuplet cases, and consider the interplay of relic density and spin-independent direct detection cross section. We show that both the relic density and direct detection cross sections depend on a single linear combination of Higgs portal couplings, ${\lambda }_{\mathrm{eff}}$. For ${\lambda }_{\mathrm{eff}}\sim \mathcal{O}(1)$, present direct detection exclusion limits imply that the neutral component of a scalar electroweak multiplet would comprise a subdominant fraction of the observed DM relic density.

15 pages, 4 figures

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• Effective field theory versus UV-complete model: vector boson scattering as a case study
• Probing Extended Scalar Sectors with Precision $e^{+}{e}^{-}\to Zh$ and Higgs Diphoton Studies
• Dark Matter candidates in a Type-II radiative neutrino mass model
• Two-loop Beta Function for Complex Scalar Electroweak Multiplets
• A Real Triplet-Singlet Extended Standard Model: Dark Matter and Collider Phenomenology
• Probing quadruplet scalar dark matter at current and future $pp$ colliders
• Non-perturbative determination of the sphaleron rate for first-order phase transitions
• Lepton number violating operators with standard model gauge fields: A survey of neutrino masses from 3-loops and their link to dark matter
• Inert sextuplet scalar dark matter at the LHC and future colliders
• Light dark matter around 100 GeV from the inert doublet model
• Phase transitions, anomalous baryon number violation and electroweak multiplet dark matter
• Thermal Real Scalar Triplet Dark Matter