String-derived D4 flavor symmetry and phenomenological implications

Abstract

In this paper we show how some flavor symmetries may be derived from the heterotic string, when compactified on a 6D orbifold. In the body of the paper we focus on the $D_4$ family symmetry, recently obtained in $Z_3\times Z_2$ orbifold constructions. We show how this flavor symmetry constrains fermion masses, as well as the soft SUSY breaking mass terms. Flavor symmetry breaking can generate the hierarchy of fermion masses and at the same time the flavor symmetry suppresses large flavor changing neutral current processes.

17 pages, no figure

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• The Double Cover of the Icosahedral Symmetry Group and Quark Mass Textures
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• Searching for the Standard Model in the String Landscape : SUSY GUTs
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• Soft supersymmetry breaking terms and lepton flavor violations in modular flavor models
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• Gauge Symmetries in Heterotic Asymmetric Orbifolds
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