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Nearly Conformal Composite Higgs Model

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

Physical Review Letters, Volume: 126, Issue: 19

Swansea University Author: Maurizio Piai Orcid Logo

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DOI (Published version): 10.1103/physrevlett.126.191804

Abstract

We analyze a composite Higgs model based on the confining SU(3) gauge theory with Nf = 8 Dirac fermions in the fundamental representation. This gauge theory has been studied on the lattice and shown to be well described by a dilaton effective field theory (EFT). Here we modify the EFT by assigning s...

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Published in: Physical Review Letters
ISSN: 0031-9007 1079-7114
Published: American Physical Society (APS) 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa56838
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Abstract: We analyze a composite Higgs model based on the confining SU(3) gauge theory with Nf = 8 Dirac fermions in the fundamental representation. This gauge theory has been studied on the lattice and shown to be well described by a dilaton effective field theory (EFT). Here we modify the EFT by assigning standard-model quantum numbers such that four of the composite pseudo-Nambu- Goldstone boson (pNGB) fields form the standard-model Higgs doublet, by coupling it to the top quark, and by adding to the potential a term that triggers electroweak symmetry breaking. The model contains a pNGB Higgs boson, a set of heavier pNGBs, and an approximate dilaton in the same mass range. We study the phenomenology of the model, and discuss the amount of tuning required to ensure consistency with current direct and indirect bounds on new physics, highlighting the role of the dilaton field.
College: Faculty of Science and Engineering
Funders: The work of M. P. has been supported in part by the STFC Consolidated Grants No. ST/P00055X/1 and No. ST/T000813/1. M. P. has also received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 813942.
Issue: 19

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