Spontaneous violation of CP symmetry in the strong interactions

Abstract

Some time ago Dashen pointed out that spontaneous CP violation can occur in the strong interactions. I show how a simple effective Lagrangian exposes the remarkably large domain of quark mass parameters for which this occurs. I close with some warnings for lattice simulations.

10 pages, 1 figure; final version to appear in PRL

References in corpus (1)

• Ambiguities in the up quark mass

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