Volume 79, Number 6, September 2007
Article Number 61001
Number of page(s) 3
Section The Physics of Elementary Particles and Fields
Published online 07 August 2007
EPL, 79 (2007) 61001
DOI: 10.1209/0295-5075/79/61001

New lepton family symmetry and neutrino tribimaximal mixing

E. Ma

Physics and Astronomy Department, University of California, Riverside - Riverside, CA 92521, USA

received 2 February 2007; accepted in final form 20 July 2007; published September 2007
published online 7 August 2007

The newly proposed finite symmetry $\Sigma (81)$ is applied to the problem of neutrino tribimaximal mixing. The result is more satisfactory than those of previous models based on A4 in that the use of auxiliary symmetries (or mechanisms) may be avoided. Deviations from the tribimaximal pattern are expected, but because of its basic structure, only ${\rm tan}^{2}\theta _{12}$ may differ significantly from 0.5 (say 0.45) with ${\rm sin}^{2}2\theta _{23}$ remaining very close to unity, and $\theta _{13}$ very nearly zero.

14.60.Pq - Neutrino mass and mixing.
11.30.Hv - Flavor symmetries.

© Europhysics Letters Association 2007