Seesaw Neutrinos from the Heterotic String
High Energy Physics - Phenomenology
2008-11-26 v2 High Energy Physics - Theory
Abstract
We study the possibility of realizing the neutrino seesaw mechanism in the E8XE8 heterotic string. In particular, we consider its Z_6 orbifold compactifications leading to the supersymmetric standard model gauge group and matter content. We find that these models possess all the necessary ingredients for the seesaw mechanism, including the required Dirac Yukawa couplings and large Majorana mass terms. We argue that this situation is quite common in heterotic orbifolds. In contrast to the conventional seesaw of grand unified theories (GUTs), no large GUT representations are needed to generate the Majorana mass terms. The total number of right--handed neutrinos can be very large, up to O(100).
Cite
@article{arxiv.hep-ph/0703078,
title = {Seesaw Neutrinos from the Heterotic String},
author = {Wilfried Buchmuller and Koichi Hamaguchi and Oleg Lebedev and Saul Ramos-Sanchez and Michael Ratz},
journal= {arXiv preprint arXiv:hep-ph/0703078},
year = {2008}
}
Comments
4 pages; to appear in Phys. Rev. Lett