Date&Time  Wed Dec 18 2019 (13:30  14:30) 

Speaker  Teruyuki Kitabayashi 
Affiliation  Tokai University 
Title  Clockwork origin of neutrino mixings 
Abstract  The clockwork mechanism provides a natural way to obtain hierarchical masses and couplings in a theory. We propose a clockwork model that has nine clockwork generations. In this model, the candidates of the origin of the neutrino mixings are nine Yukawa mass matrix elements $Y_{\alpha\beta}$ that connect neutrinos and clockwork fermions, nine clockwork mass ratios $q_{\alpha\beta}$, and nine numbers of clockwork fermions $n_{\alpha\beta}$, where $\alpha$, $\beta$ = 1, 2, 3. Assuming $Y_{\alpha\beta}$= 1, the neutrino mixings originate from the pure clockwork sector. We show that the observed neutrino mixings are exactly obtained from a clockwork model in the case of the $q_{\alpha\beta}$ origin scenario. In the $n_{\alpha\beta}$ origin scenario, the correct order of magnitude of the observed neutrino mixings is obtained from a clockwork model. 
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