The strong-CP question in SU(3)c X SU(3)L X U(1)N models
Abstract
We analyze two recent models based on the gauge group SU(3)c×SU(3)L×U(1)N where each generation is not anomaly-free, but anomaly cancels when three generations are taken into account. We show that the most general Yukawa couplings of these models admit of a Peccei-Quinn symmetry. This symmetry can be extended to the entire Lagrangian by using extra fields in a very elegant way so that the resulting axion can be made invisible.
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