A QCD R-Axion
arXiv:2407.17557 · doi:10.1103/PhysRevD.111.015048
Abstract
R-parity can be extended to a continuous global U(1) symmetry. We investigate whether an anomalous U(1) can be identified as the PQ symmetry suitable for solving the strong CP problem within supersymmetric extensions of the Standard Model. In this case, U(1) is broken at some intermediate scale and the QCD axion is the R-axion. Moreover, the R-symmetry can be naturally gauged via the Green-Schwartz mechanism within completions to supergravity, thus evading the axion quality problem. Obstacles to realizing this scenario are highlighted and phenomenologically viable approaches are identified.
50 pages
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