Scalar electroweak multiplet dark matter

• Published in: The journal of high energy physics 2019-08, Vol.2019 (8), p.1-29, Article 58
• Main Authors: Chao, Wei, Ding, Gui-Jun, He, Xiao-Gang, Ramsey-Musolf, Michael
• Format: Article
• Language: English
• Subjects: ASTRONOMY AND ASTROPHYSICS; Beyond Standard Model; Classical and Quantum Gravitation; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Cosmology of Theories beyond the SM; Couplings; Cross-sections; Dark matter; Density; Electroweak model; Elementary Particles; Higgs Physics; High energy physics; Phenomenology; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Theoretical Physics; Relativity Theory; String Theory
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP08(2019)058

A bstract 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 Φ of arbitrary SU(2) L rank and hypercharge, Y . We show that, in general, the Φ- 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, λ eff . For λ eff ∼ 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.