2026 DCPIHEP WORKSHOP - 20th Year Anniversary

Session

Plenary II

12 Jan 2026, 11:00

Ex Hacienda de Nogueras

1. Non-invertible Peccei-Quinn symmetry, natural 2HDM alignment, and the visible axion

Antonio Delgado (University of Notre Dame (US))

12/01/2026, 11:00

We identify m12 as a spurion of non-invertible Peccei-Quinn symmetry in the type II 2HDM with gauged quark flavor. Thus a UV theory which introduces quark color-flavor monopoles can naturally realize alignment without decoupling and can furthermore revive the Weinberg-Wilczek axion. As an example we consider the SU(9) theory of color-flavor unification, which needs no new fermions. This is the...