The Ĥ-parameter: an oblique Higgs view

Englert, C. , Giudice, G. F., Greljo, A. and McCullough, M. (2019) The Ĥ-parameter: an oblique Higgs view. Journal of High Energy Physics, 2019(9), 41. (doi: 10.1007/JHEP09(2019)041)

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We study, from theoretical and phenomenological angles, the Higgs boson oblique parameter Ĥ, as the hallmark of off-shell Higgs physics. Ĥ is defined as the Wilson coefficient of the sole dimension-6 operator that modifies the Higgs boson propagator, within a Universal EFT. Theoretically, we describe self-consistency conditions on Wilson coefficients, derived from the Källén-Lehmann representation. Phenomenologically, we demonstrate that the process gg → h∗ → V V is insensitive to propagator corrections from Ĥ, and instead advertise four-top production as an effective high-energy probe of off-shell Higgs behaviour, crucial to break flat directions in the EFT.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Englert, Professor Christoph
Authors: Englert, C., Giudice, G. F., Greljo, A., and McCullough, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of High Energy Physics
ISSN (Online):1029-8479
Published Online:06 September 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Journal of High Energy Physics 9:41
Publisher Policy:Reproduced under a Creative Commons License

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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