Realization of the lepton flavor structure from point interactions

¹ Department of Physics, Osaka University, Machikaneyama-Cho 1-1, Toyonaka 560-0043, Japan
² Regional Centre for Accelerator-based Particle Physics, Harish-Chandra Research Institute, Allahabad 211 019, India
³ School of Physics, Korea Institute for Advanced Study, 85 Hoegiro, Dongdaemun-gu, Seoul, 130-722 Republic of Korea
⁴ Department of Physics, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
⁵ Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue, Shimane 690-8504, Japan

^a e-mail: fujimoto@het.phys.sci.osaka-u.ac.jp

Published online: 29 May 2015

Abstract

We investigate a 5d gauge theory on S¹ with point interactions. The point interactions describe extra boundary conditions and provide three generations, the charged lepton mass hierarchy, the lepton flavor mixing and tiny degenerated neutrino masses after choosing suitable boundary conditions and parameters. The existence of the restriction in the flavor mixing, which appears from the configuration of the extra dimension, is one of the features of this model. Tiny Yukawa couplings for the neutrinos also appears without the see-saw mechanism nor symmetries in our model. The magnitude of CP violation in the leptons can be a prediction and is consistent with the current experimental data.