Resolution of the strong CP problem
arXiv:hep-ph/0006349 · doi:10.1142/S0217751X01005365
Abstract
It is shown that the quark mass aligns QCD vacuum in such a way that the strong CP is conserved, resolving the strong CP problem.
9 pages;v2 slightly rewritten and expanded;v3 a few points clarified;v4 minor changes, journal version