Stringy origin of non-Abelian discrete flavor symmetries

Details Stringy origin of non-Abelian discrete flavor symmetries Stringy origin of non-Abelian discrete flavor symmetries

2006-11-02

arxiv.org/abs/hep-ph/0611020v2

Nucl.Phys.B768:135-156,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 4 figures, v2: matches version published in Nuclear Physics B

Scientific paper

10.1016/j.nuclphysb.2007.01.018

We study the origin of non-Abelian discrete flavor symmetries in superstring theory. We classify all possible non-Abelian discrete flavor symmetries which can appear in heterotic orbifold models. These symmetries include D_4 and Delta(54). We find that the symmetries of the couplings are always larger than the symmetries of the compact space. This is because they are a consequence of the geometry of the orbifold combined with the space group selection rules of the string. We also study possible breaking patterns. Our analysis yields a simple geometric understanding of the realization of non-Abelian flavor symmetries.

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