Minimal String Unification and Yukawa Couplings in Orbifold Models
T. Kobayashi
Abstract
We study the minimal supersymmetric standard model derived from ZN × ZM orbifold models. Moduli dependent threshold corrections of the gauge couplings are investigated to explain the measured values of the coupling constants. Also we study Yukawa couplings of the models. We find that the Z2 × Z6', Z2× Z6, Z3 × Z6 and Z6 × Z6 orbifold models have the possibility to derive Yukawa couplings for the second and third generations as well as the measured gauge coupling constants. Allowed models are shown explicitly by combinations of modular weights for the matter fields.
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