Levels of U(1)y in Minimal String Model on Z(N)*Z(M) Orbifolds

Physics – High Energy Physics – High Energy Physics - Theory

Scientific paper

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14 pages, KANAZAWA-93-12, Latex file

Scientific paper

10.1016/0370-2693(94)90075-2

We study a minimal string model possessing the same massless spectra as the MSSM on $Z_N\times Z_M$ 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 $Z_3\times Z_3$ 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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