Eur. Phys. J. C (2007) 52: 617-623
https://doi.org/10.1140/epjc/s10052-007-0433-1

Regular Article - Theoretical Physics

A₄ symmetry and lepton masses and mixing

Institute for Higher Education Research and Practice, Osaka University, 1-16 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan

^* e-mail: koide@het.phys.sic.osaka-u.ac.jp

Received: 7 June 2007
Published online: 2 October 2007

Abstract

Stimulated by Ma’s idea, which explains the tribimaximal neutrino mixing by assuming an A₄ flavor symmetry, a lepton mass matrix model is investigated. A Frogatt–Nielsen-type model is assumed, and the flavor structures of the masses and mixing are caused by the VEVs of SU(2)_L singlet scalars φ_i ^u and φ_i ^d (i=1,2,3), which are assigned to 3 and (1 ,1 ’,1 ”) of A₄, respectively. Possible charged lepton and neutrino mass spectra and mixing are investigated.