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Title: The unnatural composite Higgs

Abstract

Composite Higgs models can trivially satisfy precision-electroweak and flavour constraints by simply having a large spontaneous symmetry breaking scale, f ≳ 10 TeV. This produces a ‘split’ spectrum, where the strong sector resonances have masses greater than 10 TeV and are separated from the pseudo Nambu-Goldstone bosons, which remain near the electroweak scale. Even though a tuning of order 10 –4 is required to obtain the observed Higgs boson mass, the big hierarchy problem remains mostly solved. Intriguingly, models with a fully-composite right-handed top quark also exhibit improved gauge coupling unification. By restricting ourselves to models which preserve these features we find that the symmetry breaking scale cannot be arbitrarily raised, leading to an upper bound f ≲ 100-1000 TeV. This implies that the resonances may be accessible at future colliders, or indirectly via rare-decay experiments. Dark matter is identified with a pseudo Nambu-Goldstone boson, and we show that the smallest coset space containing a stable, scalar singlet and an unbroken SU(5) symmetry is SU(7)/SU(6) × U(1). The colour-triplet pseudo Nambu-Goldstone boson also contained in this coset space is metastable due to a residual symmetry. Furthermore, it can decay via a displaced vertex when produced at colliders, leading to amore » distinctive signal of unnaturalness.« less

Authors:
 [1];  [2];  [3];  [1]
  1. Univ. of Melbourne, Victoria (Australia). ARC Centre of Excellence for Particle Physics at the Terascale
  2. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
  3. Indian Inst. of Technology (IIT), Kharagpur (India). Dept. of Physics
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1454605
Grant/Contract Number:  
SC0011842
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2015; Journal Issue: 1; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; GUT; Technicolor and Composite Models; Cosmology of Theories beyond the SM

Citation Formats

Barnard, James, Gherghetta, Tony, Ray, Tirtha Sankar, and Spray, Andrew. The unnatural composite Higgs. United States: N. p., 2015. Web. doi:10.1007/JHEP01(2015)067.
Barnard, James, Gherghetta, Tony, Ray, Tirtha Sankar, & Spray, Andrew. The unnatural composite Higgs. United States. doi:10.1007/JHEP01(2015)067.
Barnard, James, Gherghetta, Tony, Ray, Tirtha Sankar, and Spray, Andrew. Wed . "The unnatural composite Higgs". United States. doi:10.1007/JHEP01(2015)067. https://www.osti.gov/servlets/purl/1454605.
@article{osti_1454605,
title = {The unnatural composite Higgs},
author = {Barnard, James and Gherghetta, Tony and Ray, Tirtha Sankar and Spray, Andrew},
abstractNote = {Composite Higgs models can trivially satisfy precision-electroweak and flavour constraints by simply having a large spontaneous symmetry breaking scale, f ≳ 10 TeV. This produces a ‘split’ spectrum, where the strong sector resonances have masses greater than 10 TeV and are separated from the pseudo Nambu-Goldstone bosons, which remain near the electroweak scale. Even though a tuning of order 10–4 is required to obtain the observed Higgs boson mass, the big hierarchy problem remains mostly solved. Intriguingly, models with a fully-composite right-handed top quark also exhibit improved gauge coupling unification. By restricting ourselves to models which preserve these features we find that the symmetry breaking scale cannot be arbitrarily raised, leading to an upper bound f ≲ 100-1000 TeV. This implies that the resonances may be accessible at future colliders, or indirectly via rare-decay experiments. Dark matter is identified with a pseudo Nambu-Goldstone boson, and we show that the smallest coset space containing a stable, scalar singlet and an unbroken SU(5) symmetry is SU(7)/SU(6) × U(1). The colour-triplet pseudo Nambu-Goldstone boson also contained in this coset space is metastable due to a residual symmetry. Furthermore, it can decay via a displaced vertex when produced at colliders, leading to a distinctive signal of unnaturalness.},
doi = {10.1007/JHEP01(2015)067},
journal = {Journal of High Energy Physics (Online)},
number = 1,
volume = 2015,
place = {United States},
year = {2015},
month = {1}
}

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Cited by: 16 works
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