While the discovery of non-zero neutrino masses is one of the most important accomplishments by physicists in the past century, it is still unknown how and in what form these masses arise. Lepton number-violating neutrinoless double beta decay is a natural consequence of Majorana neutrinos and many BSM theories, and several experimental efforts are involved in the search for these … Read More

Abstract: I will discuss a framework in which the QCD axion has an exponentially large coupling to photons, relying on the “clockwork” mechanism. I discuss the impact of present and future axion experiments on the parameter space of the model. In addition to the axion, the model predicts a large number of pseudo-scalars which can be light and observable at … Read More

Abstract: Since the discovery of the Higgs boson, new particle searches at the Large Hadron Collider appear to make the Standard Model’s hierarchy problem more puzzling. The most powerful searches look for new particles carrying standard model color. However, the particles related to the hierarchy problem’s solution may be color neutral. These realizations of Neutral Naturalness generally have very different … Read More