Flavorful UV Instantons and the Strong CP Problem

Speaker: Kiel Howe, Fermilab

Speaker arrival: 21/09/2016

Speaker departure: 27/09/2016

Assigned office: 23

Title: Flavorful UV Instantons and the Strong CP Problem

Place: Seminario

Date: 22/09/2016

Time: 17:00

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.