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Dilaton Effective Field Theory

Thomas Appelquist Orcid Logo, James Ingoldby Orcid Logo, Maurizio Piai Orcid Logo

Universe, Volume: 9, Issue: 1, Start page: 10

Swansea University Author: Maurizio Piai Orcid Logo

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Abstract

We review and extend recent studies of dilaton effective field theory (dEFT) which provide a framework for the description of the Higgs boson as a composite structure. We first describe the dEFT as applied to lattice data for a class of gauge theories with near-conformal infrared behavior. It includ...

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Published in: Universe
ISSN: 2218-1997
Published: MDPI AG 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa62099
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Abstract: We review and extend recent studies of dilaton effective field theory (dEFT) which provide a framework for the description of the Higgs boson as a composite structure. We first describe the dEFT as applied to lattice data for a class of gauge theories with near-conformal infrared behavior. It includes the dilaton associated with the spontaneous breaking of (approximate) scale invariance, and a set of pseudo-Nambu-Goldstone bosons (pNGBs) associated with the spontaneous breaking of an (approximate) internal global symmetry. The theory contains two small symmetry-breaking parameters. We display the leading-order (LO) Lagrangian, and review its fit to lattice data for the SU(3) gauge theory with Nf = 8 Dirac fermions in the fundamental representation. We then develop power-counting rules to identify the corrections emerging at next-to-leading order (NLO) in the dEFT action. We list the NLO operators that appear and provide estimates for the coefficients. We comment on implications for composite-Higgs model building.
Keywords: lattice gauge theory; physics beyond the standard model
College: Faculty of Science and Engineering
Funders: The work of M.P. was supported, in part, by the STFC Consolidated Grants No. ST/P00055X/1 and No. ST/T000813/1. M.P. received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 813942.
Issue: 1
Start Page: 10