Non-decoupling new particles

Banta, I., Cohen, T., Craig, N., Lu, X. and Sutherland, D. (2022) Non-decoupling new particles. Journal of High Energy Physics, 2022(2), 29. (doi: 10.1007/JHEP02(2022)029)

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Abstract

We initiate the study of a new class of beyond the Standard Model states that we call “Loryons.” They have the defining characteristic of being non-decoupling, in the sense that their physical mass is dominated by a contribution from the vacuum expectation value of the Higgs boson. The stakes are high: the discovery of a Loryon would tell us that electroweak symmetry must be non-linearly realized in the effective field theory of the Standard Model. Loryons have their masses bounded from above by perturbative unitarity considerations and thus define a finite parameter space for exploration. After providing a complete catalog of Loryon representations under mild assumptions, we turn to examining the constraints on the parameter space from Higgs couplings measurements, precision electroweak tests, and direct collider searches. We show that most fermionic candidates are already ruled out (with some notable exceptions), while much of the scalar Loryon parameter space is still wide open for discovery.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Sutherland, Dr David
Authors: Banta, I., Cohen, T., Craig, N., Lu, X., and Sutherland, D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of High Energy Physics
Publisher:Springer
ISSN:1126-6708
ISSN (Online):1029-8479
Published Online:03 February 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in Journal of High Energy Physics 2022(2): 29
Publisher Policy:Reproduced under a Creative Commons License

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