A high quality composite axion
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A high quality composite axion

  • Author(s): Lillard, Benjamin;
  • Tait, Tim MP
  • et al.

Published Web Location

https://arxiv.org/pdf/1811.03089.pdf
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Abstract

Abstract The strong CP problem is a compelling motivation for physics beyond the Standard Model. The most popular solutions invoke a global U(1)PQ symmetry, but are challenged by quantum gravitational corrections which are thought to be incompatible with global symmetries, arguing that realistic theories contain additional structure. We explore a construction in which the U(1)PQ symmetry is protected to arbitrary order by virtue of a supersymmetric, confining SU(N) L × SU(N) × SU(N) R × U(1) X product gauge group, achieving $$ \left|\overline{\uptheta}\right| $$ θ ¯ < 10−11 for an SU(5) model with f a ≲ 3 × 1011 GeV. This construction leads to low energy predictions such as a U(1) X gauge symmetry, and for X = B − L engineers a naturally $$ \mathcal{O} $$ O (TeV) value for the μ parameter of the MSSM.

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