A strong electroweak phase transition in the 2HDM after LHC8

Dorsch, G C, Huber, S J and No, J M (2013) A strong electroweak phase transition in the 2HDM after LHC8. Journal of High Energy Physics, 2013 (10). pp. 1-21. ISSN 1029-8479

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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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics > QC0770 Nuclear and particle physics. Atomic energy. Radioactivity > QC0793 Elementary particle physics
Depositing User: Jose No
Date Deposited: 15 May 2014 09:02
Last Modified: 07 Mar 2017 03:59
URI: http://sro.sussex.ac.uk/id/eprint/48637

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