Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published August 2019 | Submitted + Published
Journal Article Open

Scalar electroweak multiplet dark matter


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.

Additional Information

© 2019 The Author(s). This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Article funded by SCOAP3. Received: February 25, 2019; Revised: June 24, 2019; Accepted: July 7, 2019; Published: August 9, 2019. WC was supported in part by the Natural Science Foundation of China under Grant No. 11775025 and the Fundamental Research Funds for the Central Universities. GJD was supported in part by the support of the National Natural Science Foundation of China under Grant No 11522546. XGH was supported in part by the MOST (Grant No. MOST 106-2112-M-002-003-MY3), and in part by Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education, and Shanghai Key Laboratory for Particle Physics and Cosmology (Grant No. 15DZ2272100), and in part by the NSFC (Grant Nos. 11575111 and 11735010). MJRM was supported in part under U.S. Department of Energy contract DE-SC0011095.

Attached Files

Published - Chao2019_Article_ScalarElectroweakMultipletDark.pdf

Submitted - 1812.07829.pdf


Files (1.0 MB)
Name Size Download all
438.0 kB Preview Download
574.0 kB Preview Download

Additional details

August 19, 2023
October 18, 2023