Yukawa Textures in String Unified Models With SU(4)xO(4) Symmetry
Abstract
We discuss the origin of Yukawa textures in the string-inspired and string derived models based on the gauge group SU(4)xSU(2)_LxSU(2)_R supplemented by a U(1)_X gauged family symmetry. The gauge symmetries are broken down to those of the minimal supersymmetric standard model which is the effective theory below 10^16 GeV. The combination of the U(1)_X family symmetry and the Pati-Salam gauge group leads to a successful and predictive set of Yukawa textures involving two kinds of texture zeroes: horizontal and vertical texture zeroes. We discuss both symmetric and non-symmetric textures in models of this kind, and in the second case perform a detailed numerical fit to the charged fermion mass and mixing data. Two of the Yukawa textures allow a low energy fit to the data with a total chi^2 of 0.39 and 1.02 respectively, for three degrees of freedom. We also make a first attempt at deriving the non - renormalisable operators required for the Yukawa textures from string theory.
Keywords
Cite
@article{arxiv.hep-ph/9610517,
title = {Yukawa Textures in String Unified Models With SU(4)xO(4) Symmetry},
author = {B. C. Allanach and S. F. King and G. K. Leontaris and S. Lola},
journal= {arXiv preprint arXiv:hep-ph/9610517},
year = {2014}
}
Comments
Revised version to include string section on origin of non-renormalisable operators. 54 pages LaTeX