arXiv:hep-ph/0202171·v2·High Energy Physics — Phenomenology
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.
Comments: 7 pages, latex