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

H. Kawabe, T. Kobayashi, N. Ohtsubo

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)…