Electroweak baryogenesis and dark matter from a singlet Higgs
Abstract
If the Higgs boson H couples to a singlet scalar S via lambda_m |H|^2 S^2, a strong electroweak phase transition can be induced through a large potential barrier that exists already at zero temperature. In this case properties of the phase transition can be computed analytically. We show that electroweak baryogenesis can be achieved using CP violation from a dimension-6 operator that couples S to the top-quark mass, suppressed by a new physics scale that can be well above 1 TeV. Moreover the singlet is a dark matter candidate whose relic density is < 3% of the total dark matter density, but which nevertheless interacts strongly enough with nuclei (through Higgs exchange) to be just below the current XENON100 limits. The DM mass is predicted to be in the range 80-160 GeV.
Cite
@article{arxiv.1210.4196,
title = {Electroweak baryogenesis and dark matter from a singlet Higgs},
author = {James M. Cline and Kimmo Kainulainen},
journal= {arXiv preprint arXiv:1210.4196},
year = {2013}
}
Comments
9 pages, 8 figures; v2: added references and clarifications--published version; v3: fixed plotting error in fig. 3 and factor of 2 error in eqs. (3.2,3.3)--results unaffected