Levels of U(1)y in Minimal String Model on Z(N)*Z(M) Orbifolds
H. Kawabe, T. Kobayashi, N. Ohtsubo
Abstract
We study a minimal string model possessing the same massless spectra as the MSSM on ZN× ZM orbifolds. Threshold corrections of the gauge coupling constants of SU(3), SU(2) and U(1)Y are investigated in a case of an overall modulus. Using computer analyses, we search ranges of levels of U(1)Y allowed by the LEP experiments. It is found that Z3× Z3 can not derive the minimal string model for a MZ SUSY breaking scale. The minimum values of the overall moduli are estimated within the ranges of the levels.
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