Possibility of multi-step electroweak phase transition in the two Higgs doublet models
Abstract
We discuss whether a multi-step electroweak phase transition (EWPT) occurs in two Higgs doublet models (2HDMs). The EWPT is related to interesting phenomena such as baryogenesis and a gravitational wave from it. We examine parameter regions in CP-conserving 2HDMs and find certain areas where the multi-step EWPTs occur. The parameter search shows the multi-step EWPT prefers the scalar potential with the approximate symmetry and a mass hierarchy between the neutral CP-odd and CP-even extra scalar bosons . By contrast, the multi-step EWPT whose first step is strongly first order favors a mass hierarchy . In addition, we compute the Higgs trilinear coupling in the parameter region where the multi-step EWPTs occur, which can be observed at future colliders. We also discuss a multi-peaked gravitational wave from a multi-step EWPT.
Cite
@article{arxiv.2106.03439,
title = {Possibility of multi-step electroweak phase transition in the two Higgs doublet models},
author = {Mayumi Aoki and Takatoshi Komatsu and Hiroto Shibuya},
journal= {arXiv preprint arXiv:2106.03439},
year = {2022}
}
Comments
34 pages, 20 figures, 5 tables; Published version