TH BSM Forum

Flavored Axion Models

by Robert Andreas Ziegler (T)

4-3-006 - TH Conference Room (CERN)

4-3-006 - TH Conference Room


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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 PQ 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 avoiding the SN/WD constraint. 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 PQ 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.

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