Abstract
We study a minimal string model possessing the same massless spectra as the MSSM on Z N × Z M 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 Z 3× Z 3 can not derive the minimal string model for a M Z SUSY breaking scale. The minimum values of the overall moduli are estimated within the ranges of the levels.
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