Echoes of the electroweak phase transition: discovering a second Higgs doublet through A0 → ZH0

Dorsch, G C, Huber, S J, Mimasu, K and No, J M (2014) Echoes of the electroweak phase transition: discovering a second Higgs doublet through A0 → ZH0. Physical Review Letters (PRL), 113 (21). p. 211802. ISSN 0031-9007

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Abstract

The existence of a second Higgs doublet in nature could lead to a cosmological first-order electroweak
phase transition and explain the origin of the matter-antimatter asymmetry in the Universe. We obtain the
spectrum and properties of the new scalars H0, A0, and H� that signal such a phase transition and show that
the observation of the decay A0 → ZH0 at LHC would be a “smoking gun” signature of these scenarios. We
analyze the LHC search prospects for this decay in the llbb¯ and llWþW− final states, arguing that current
data may be sensitive to this signature in the former channel as well as there being great potential for a
discovery in either channel at the very early stages of the 14 TeV run.

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: Catrina Hey
Date Deposited: 06 Jan 2015 10:59
Last Modified: 06 Mar 2017 17:07
URI: http://sro.sussex.ac.uk/id/eprint/51896

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Project NameSussex Project NumberFunderFunder Ref
Particle Physics Theory at Royal Holloway and SussexG0742STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/J000477/1