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Event Number 4231

  Tuesday, October 4th, 2016

Theory Seminar (High Energy/Cosmology)
Flavorful UV Instantons and the Strong CP Problem
Time: 3:30 pm
Place: 5280 Chamberlin
Speaker: Kiel Howe, Fermilab
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.
Host: Joshua Berger
Presentation: FlavorfulInstantons-Madison.pdf
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