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  • Letter
  • Open Access

Lighter QCD axion from anarchy

Fatemeh Elahi*, Gilly Elor†, Alexey Kivel‡, Julien Laux§, Saereh Najjari∥, and Felix Yu

  • PRISMA+ Cluster of Excellence and Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099 Mainz, Germany

  • *felahi@uni-mainz.de
  • †gelor@uni-mainz.de
  • ‡alkivel@uni-mainz.de
  • §jlaux01@uni-mainz.de
  • ∥snajjari@uni-mainz.de
  • yu001@uni-mainz.de
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Phys. Rev. D 108, L031701 – Published 10 August, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L031701

Abstract

We introduce the anarchic axion, a class of axion models which solves the strong CP problem within current nEDM constraints with a lighter than usual QCD axion, thus populating new parameter space that ongoing and future experiments target. The anarchic axion is driven light by a soft breaking of the Peccei-Quinn symmetry, which also predicts a residual neutron electric dipole moment. We introduce a novel measure to quantify the tuning required for large deviations from the usual QCD axion band. In addition to motivating searches for unusually light axions, this work establishes a new target for axion effective field theory.

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Phys. Rev. D 108, L031701– Published 10 August, 2023
  • Received 18 February 2023
  • Accepted 18 July 2023
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