New Solutions to the Strong CP Problem

Abstract

We exhibit a solution to the strong CP problem in which ultraviolet physics renders the QCD theta angle physically unobservable. Our models involve new strong interactions beyond QCD and particles charged under both the new interactions and ordinary color.

RevTex, 2-columns, 5 pages, 1 fig. Revised version, including additional discussion of the UV theory and the low-energy effective theory, to appear in Physics Letters B

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• Ambiguities in the up quark mass
• A supernova constraint on bulk majorons
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