Friedberg-Lee Symmetry Breaking and Its Prediction for theta_13
Abstract
We consider an effective Majorana neutrino mass operator with the Friedberg-Lee symmetry; i.e., it is invariant under the transformation \nu_\alpha -> \nu_\alpha + z (for \alpha = e, \mu, \tau) with z being a space-time independent constant element of the Grassmann algebra. We show that this new flavor symmetry can be broken in such a nontrivial way that the lightest neutrino remains massless but an experimentally-favored neutrino mixing pattern is achievable. In particular, we get a novel prediction for the unknown neutrino mixing angle \theta_13 in terms of two known angles: \sin\theta_13 = \tan\theta_12 |(1- \tan\theta_23)/ (1+\tan\theta_23)|. The model can simply be generalized to accommodate CP violation and be combined with the seesaw mechanism.
Cite
@article{arxiv.hep-ph/0611360,
title = {Friedberg-Lee Symmetry Breaking and Its Prediction for theta_13},
author = {Shu Luo and Zhi-zhong Xing},
journal= {arXiv preprint arXiv:hep-ph/0611360},
year = {2008}
}
Comments
RevTex 9 pages, 2 PS figures. More discussions added. Version accepted for publication in Phys. Lett. B