Higher-Dimensional QCD without the Strong CP Problem
K. -I. Izawa, T. Watari, T. Yanagida
Abstract
QCD in a five-dimensional sliced bulk with chiral extra-quarks on the boundaries is generically free from the strong CP problem. Accidental axial symmetry is naturally present except for suppressed breaking interactions, which plays a role of the Peccei-Quinn symmetry to make the strong CP phase sufficiently small.
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