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Title: Factoring the strong CP problem

Abstract

We present a new mechanism to solve the strong CP problem using $$N\geq2$$ axions, each dynamically relaxing part of the $$\bar\theta$$ parameter. At high energies $$M\gg\Lambda_{QCD}$$ the $$SU(3)_{c}$$ group becomes the diagonal subgroup of an $$SU(3)^{N}$$ gauge group, and the non-perturbative effects in each individual $SU(3)$ factor generate a potential for the corresponding axion. The vacuum is naturally aligned to ensure $$\bar\theta=0$$ at low energies, and the masses of these axions can be much larger than for the standard QCD axion. This mechanism avoids the introduction of a discrete $$Z_2$$ symmetry and associated 'mirror' copies of the SM fermions, and also avoids the introduction and stabilization of new light colored states to modify the running of the QCD gauge coupling found in other heavy axion models. This strengthens the motivation for axion-like particles solving the strong CP problem at points beyond the standard QCD axion curve in the $$(m_a, f_a)$$ plane.

Authors:
 [1]; ORCiD logo [2]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1469012
Report Number(s):
arXiv:1710.04213; FERMILAB-PUB-17-500-T
Journal ID: ISSN 1029-8479; 1630478
Grant/Contract Number:  
AC02-07CH11359
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: 2018; Journal Issue: 12; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Anomalies in Field and String Theories; Beyond Standard Model; CP violation; Solitons Monopoles and Instantons

Citation Formats

Agrawal, Prateek, and Howe, Kiel. Factoring the strong CP problem. United States: N. p., 2018. Web. doi:10.1007/JHEP12(2018)029.
Agrawal, Prateek, & Howe, Kiel. Factoring the strong CP problem. United States. doi:10.1007/JHEP12(2018)029.
Agrawal, Prateek, and Howe, Kiel. Thu . "Factoring the strong CP problem". United States. doi:10.1007/JHEP12(2018)029. https://www.osti.gov/servlets/purl/1469012.
@article{osti_1469012,
title = {Factoring the strong CP problem},
author = {Agrawal, Prateek and Howe, Kiel},
abstractNote = {We present a new mechanism to solve the strong CP problem using $N\geq2$ axions, each dynamically relaxing part of the $\bar\theta$ parameter. At high energies $M\gg\Lambda_{QCD}$ the $SU(3)_{c}$ group becomes the diagonal subgroup of an $SU(3)^{N}$ gauge group, and the non-perturbative effects in each individual $SU(3)$ factor generate a potential for the corresponding axion. The vacuum is naturally aligned to ensure $\bar\theta=0$ at low energies, and the masses of these axions can be much larger than for the standard QCD axion. This mechanism avoids the introduction of a discrete $Z_2$ symmetry and associated 'mirror' copies of the SM fermions, and also avoids the introduction and stabilization of new light colored states to modify the running of the QCD gauge coupling found in other heavy axion models. This strengthens the motivation for axion-like particles solving the strong CP problem at points beyond the standard QCD axion curve in the $(m_a, f_a)$ plane.},
doi = {10.1007/JHEP12(2018)029},
journal = {Journal of High Energy Physics (Online)},
number = 12,
volume = 2018,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 5 works
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Figures / Tables:

Figure 1. Figure 1.: An instanton vacuum-diagram schematically generates a short distance contribution to the axion potential that is proportional to the breakings of the individual quark chiral U(1) factors by the Higgs Yukawa couplings. The dominant contribution at short distances is proportional to the Higgs vacuum fluctuations, corresponding to looping offmore » the Higgs propagators.« less

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