A Tale of Two-U(1) Axion Models
arXiv:2009.01452 · doi:10.1103/PhysRevD.103.095025
Abstract
The global symmetry to solve the strong problem could be the remnant of multi- symmetries from QCD and hidden strong dynamics. Both Peccei-Quinn and dynamical are described uniformly, based on which we classify various mixed two- models to solve both strong and quality problems. We propose a moose diagram method with different fermion assignments to directly read relations between phases, which illustrate how strong problem is solved in terms of cancellation between phases. In two axion models, we find the lightest axion is still same as QCD axion at infrared region, while one axion model with symmetry enhances the axion mass spectrum. Our discussions can be extended to multi-axion cases.
arXiv comment25 pages, 3 figures
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