1. Solving the strong CP problem without axions
- Author
-
Feruglio, Ferruccio, Parriciatu, Matteo, Strumia, Alessandro, and Titov, Arsenii
- Subjects
High Energy Physics - Phenomenology ,High Energy Physics - Theory - Abstract
We formulate general conditions under which the strong CP problem is solved by spontaneous CP violation. Quark-mass matrix elements are polynomials in the CP-breaking order parameters, engineered such that their determinant is a real constant. This scheme permits only a limited number of textures. These conditions can be realized in supersymmetric theories with CP as an anomaly-free local flavour symmetry, suggesting a unified solution to the strong CP problem and the flavour puzzle. Our solution can be implemented using either modular invariance or a local U(1) symmetry. We present modular-invariant realizations where matter fields are assigned small modular weights $\pm2$ ($\pm1$), utilising higher levels $N=2$ ($N=3$). Heavy quarks are in general not required, but their presence allows for models where colored particles fill non-singlet representations of the flavour group., Comment: 44 pages. Final version to appear on JHEP. Webinar presentation: https://youtu.be/iu7i_PvJyTo
- Published
- 2024