Electroweak phase transition with magnetization

Abstract

We examine the theoretical and phenomenological properties of two-Higgs-doublet extensions of the Standard Model. The lightest neutral scalar state of the 2HDM is identified with the observed Standard Model Higgs boson, having a mass of m_h = 125.26 GeV.
The parameter space of this framework is extensive and accommodates a wide range of potential New Physics scenarios. At the same time, it is strongly constrained by both theoretical considerations and experimental data. In particular, models with an extended scalar sector must satisfy the Sakharov conditions in order to account for the observed baryon asymmetry of the Universe.
In this study, we investigate whether the Sakharov conditions can be realized within the 2HDM. Our focus is on identifying regions of the parameter space that allow for a first-order electroweak phase transition. Since the Standard Model itself fails to meet the Sakharov criteria, resolving this issue remains one of the key open problems in particle physics. Consequently, the search for viable extensions
of the Standard Model that fulfill these conditions continues to be a timely and important direction of research.