Uncovering an Axion Mechanism with the EDM Portfolio

Abstract

Effective field theory arguments suggest that if BSM sectors contain new sources of CP-violation that couple to QCD, these sources will renormalize the $\theta$ term and frustrate ultraviolet solutions to the strong CP problem. Simultaneously, they will generate distinctive patterns of low-energy electric dipole moments in hadronic, nuclear, atomic, and molecular systems. Observing such patterns thus provides evidence that strong CP is solved by an infrared relaxation mechanism. We illustrate the renormalization of $\theta$ and the collections of EDMs generated in a several models of BSM physics, confirming effective field theory expectations, and demonstrate that measurements of ratios of electric dipole moments at planned experiments can provide valuable input on the resolution of the strong CP problem.

29 pages, 4 figures

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Cited by in corpus (4)

• A low-energy perspective on the minimal left-right symmetric model
• CP-violating axion interactions in effective field theory
• Novel loop-diagrammatic approach to QCD $\theta$ parameter and application to the left-right model
• Parity from gauge symmetry