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Selection Rules for Nonrenormalizable Couplings in Superstring Theories

T. Kobayashi

hep-pharXiv:hep-ph/9504371

Abstract

We study nonrenormalizable coupling terms in ZN orbifold models. Nontrivial selection rules of couplings are provided and cannot be understood in terms of a simple symmetry of effective field theories. We also discuss phenomenological implications of theses selection rules for the quark mass matrices.

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