A Strongly First-Order Electroweak Phase Transition from Loryons
arXiv:2202.04608 · doi:10.1007/JHEP06(2022)099
Abstract
We study the effect of BSM particles receiving most of their mass from their coupling to the Higgs boson ("Loryons") on the electroweak phase transition. The existence of BSM Loryons would imply that electroweak symmetry must be non-linearly realized in the effective theory of the Standard Model. Since, by definition, Loryons have a significant coupling to the Higgs, they are expected to have a significant effect on the Higgs effective potential and thereby the electroweak phase transition. We show that the BSM Loryon parameter space viable under current experimental and theoretical constraints overlaps heavily with the parameter space in which a strongly first-order phase transition is predicted. The portion of the experimentally allowed parameter space which gives a strongly first-order phase transition is significantly larger for Loryons as compared to non-Loryons.
arXiv comment21 pages, 2 figures. Matches published version. Updates to sections 2 and 3.2 and miscellaneous minor changes relative to v1
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