Dirac neutrinos from Peccei-Quinn symmetry: a fresh look at the axion

Abstract

We show that a very simple solution to the strong CP problem naturally leads to Dirac neutrinos. Small effective neutrino masses emerge from a type I Dirac seesaw mechanism. Neutrino mass limits probe the axion parameters in regions currently inaccessible to conventional searches.

arXiv comment6 pages, 3 figures, 2 tables

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