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Flavored Axion Models

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If you have a question about this talk, please contact Francesco Coradeschi.

I will discuss two scenarios that give rise to QCD axions with large flavor-violating couplings at tree-level. The first scenario is a class of generalized DFSZ models with Peccei-Quinn charges compatible with a 2+1 flavor structure, in which the flavor misalignment are treated as free parameters and control both diagonal and flavor-violating axion couplings. This structure allows to construct axion models that have suppressed couplings to nucleons and electrons, thus relaxing the most stringent astrophysical constraints. The axion can be as heavy as 0.2 eV and therefore be tested at the next generation of helioscopes. In the second scenario the Peccei-Quinn symmetry is identified with a U(1) Froggatt-Nielsen symmetry, so that axion couplings to fermions and photons are related to fermion masses and mixings. Both scenarios can be tested by precision flavor experiments like NA62 .

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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