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PIRSA:16100033

Video URL

https://pirsa.org/16100033

Flavorful UV Instantons and the Strong CP Problem

Howe, K. (2016). Flavorful UV Instantons and the Strong CP Problem . Perimeter Institute for Theoretical Physics. https://pirsa.org/16100033

Kiel Howe Stanford University

Talk numberPIRSA:16100033
DOI10.48660/16100033
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

We describe a new solution to the strong CP problem inspired by the massless up quark solution. At high energies, QCD is embedded in a SU(3)xSU(3)xSU(3) model, with each matter generation charged under a different site. Instanton effects are unsuppressed at the scale of Higgsing to the SM diagonal QCD, and a set of anomalous U(1)_PQ symmetries removes the low-energy strong CP phase. A non-zero theta parameter is generated at loop level near current bounds. Similar models can also lead to a heavy axion solution to the strong CP problem.