MINIMAL STRING UNIFICATION AND CONSTRAINT ON HIDDEN SECTOR

被引:26
作者
KAWABE, H
KOBAYASHI, T
OHTSUBO, N
机构
[1] KANAZAWA UNIV,DEPT PHYS,KANAZAWA,ISHIKAWA 92011,JAPAN
[2] KANAZAWA INST TECHNOL,ISHIKAWA 921,JAPAN
关键词
D O I
10.1016/0550-3213(94)00465-Q
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We examine whether a minimal string model possessing the same massless spectra as the MSSM can be obtained from Z(4), Z(6) and Z(8) orbifold constructions. Using an anomaly cancellation condition of the target space duality symmetry, we derive allowable values of a level k(1) of U(1)(Y) for the minimal string model on the orbifolds through computer analyses. We investigate threshold corrections of the gauge coupling constants of SU(3), SU(2) and U(1)Y and examine consistencies of the model with the LEP experiments. It is found that Z(4) and Z(8)-II cannot derive the minimal string model but Z(6)-I, Z(6)-II and Z(8)-I are possible to derive it with k(1) = 29/21, 1 less than or equal to k(1) less than or equal to 32/21 and 1 less than or equal to k(1) less than or equal to 41/21, respectively, We obtain explicitly allowed combinations of modular weights. The minimum values of the moduli on unrotated planes are estimated within the ranges of the levels. Further we investigate what kinds of hidden sectors are consistent with the minimal string models. Also their gauge coupling constants of the hidden groups are estimated, We discuss Yukawa couplings of the models.
引用
收藏
页码:210 / 230
页数:21
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