Abstract
We derive sufficient conditions that guarantee a robust solution of the strong CP problem in theories with spontaneous CP violation, and introduce a class of models satisfying these requirements. In the simplest scenarios the dominant contribution to the topological angle arises at 3-loop order in the Standard Model Yukawa couplings. A variety of new realizations are obtained on a warped extra dimension, which can dynamically generate a CKM phase of the right size as well as the Planck-TeV hierarchy. Experimental signatures of this approach to the strong CP problem include a characteristic pattern of flavor violation and vector-like partners of the top and/or bottom quarks.
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Vecchi, L. Spontaneous CP violation and the strong CP problem. J. High Energ. Phys. 2017, 149 (2017). https://doi.org/10.1007/JHEP04(2017)149
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DOI: https://doi.org/10.1007/JHEP04(2017)149