Power meets precision to explore the symmetric Higgs portal

Englert, C. , Jaeckel, J., Spannowsky, M. and Stylianou, P. (2020) Power meets precision to explore the symmetric Higgs portal. Physics Letters B, 806, 135526. (doi: 10.1016/j.physletb.2020.135526)

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We perform a comprehensive study of collider aspects of a Higgs portal scenario that is protected by an unbroken ℤ2 symmetry. If the mass of the Higgs portal scalar is larger than half the Higgs mass, this scenario becomes very difficult to detect. We provide a detailed investigation of the model's parameter space based on analyses of the direct collider sensitivity at the LHC as well as at future lepton and hadron collider concepts and analyse the importance of these searches for this scenario in the context of expected precision Higgs and electroweak measurements. In particular we also consider the associated electroweak oblique corrections that we obtain in a first dedicated two-loop calculation for comparisons with the potential of, e.g., GigaZ. The currently available collider projections corroborate an FCC-hh 100 TeV as a very sensitive tool to search for such a weakly-coupled Higgs sector extension, driven by small statistical uncertainties over a large range of energy coverage. Crucially, however, this requires good theoretical control. Alternatively, Higgs signal-strength measurements at an optimal FCC-ee sensitivity level could yield comparable constraints.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Stylianou, Mr Panagiotis and Englert, Professor Christoph
Authors: Englert, C., Jaeckel, J., Spannowsky, M., and Stylianou, P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physics Letters B
ISSN (Online):1873-2445
Published Online:30 May 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Physics Letters B 806:135526
Publisher Policy:Reproduced under a Creative Commons licence
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
173809Phenomenology from Lattice QCD and Collider PhysicsChristine DaviesScience and Technology Facilities Council (STFC)ST/P000746/1P&S - Physics & Astronomy
308821STFC Glasgow 2019 DTPMartin HendryScience and Technology Facilities Council (STFC)ST/T506102/1P&S - Physics & Astronomy