Seesaw Neutrinos from the Heterotic String

Details Seesaw Neutrinos from the Heterotic String Seesaw Neutrinos from the Heterotic String

2007-03-07

arxiv.org/abs/hep-ph/0703078v2

Phys.Rev.Lett.99:021601,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages; to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.99.021601

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).

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