Dilaton Effective Field Theory

We review and extend recent studies of dilaton effective field theory (dEFT) that 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. This inclu...

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Bibliographic Details
Published inUniverse (Basel) Vol. 9; no. 1; p. 10
Main Authors Appelquist, Thomas, Ingoldby, James, Piai, Maurizio
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.01.2023
Subjects
lattice gauge theory
Light
physics beyond the standard model
Quantum field theory
Quarks
Symmetry
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Summary:We review and extend recent studies of dilaton effective field theory (dEFT) that 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. This 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.
ISSN:2218-1997
2218-1997
DOI:10.3390/universe9010010