A strong electroweak phase transition in the 2HDM after LHC8
High Energy Physics - Phenomenology
2013-10-30 v2 Cosmology and Nongalactic Astrophysics
Abstract
The nature of the electroweak phase transition in two-Higgs-doublet models is revisited in light of the recent LHC results. A scan over an extensive region of their parameter space is performed, showing that a strongly first-order phase transition favours a light neutral scalar with SM-like properties, together with a heavy pseudo-scalar (m_A^0 > 400 GeV) and a mass hierarchy in the scalar sector, m_H^+ < m_H^0 < m_A^0. We also investigate the h^0 -> gamma gamma decay channel and find that an enhancement in the branching ratio is allowed, and in some cases even preferred, when a strongly first-order phase transition is required.
Cite
@article{arxiv.1305.6610,
title = {A strong electroweak phase transition in the 2HDM after LHC8},
author = {G. C. Dorsch and S. J. Huber and J. M. No},
journal= {arXiv preprint arXiv:1305.6610},
year = {2013}
}