Phys. Rev. D 52, 2951–2959 (1995)Quark masses and chiral symmetryReceived 10 May 1995; published in the issue dated 1 September 1995 I discuss the global structure of the strongly interacting gauge theory of quarks and gluons as a function of the quark masses and the CP-violating parameter θ. I concentration on whether a first order phase transition occurs at θ=π. I show why this is expected when multiple flavors have a small degenerate mass. This transition can be removed by sufficient flavor breaking. I speculate on the implications of this structure for Wilson’s lattice fermions. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.52.2951
DOI:
10.1103/PhysRevD.52.2951
PACS:
11.10.-z, 11.30.Rd, 11.15.Tk, 11.15.Ha
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