How to Reach the Correct sin^2θ_W and α_S in String Theory

Details How to Reach the Correct sin^2θ_W and α_S in String Theory How to Reach the Correct sin^2θ_W and α_S in String Theory

1995-10-03

arxiv.org/abs/hep-th/9510009v1

Phys.Lett.B367:126-133,1996

Physics

High Energy Physics

High Energy Physics - Theory

11 LaTex pages with 2 figures

Scientific paper

10.1016/0370-2693(95)01400-4

Effective theories with the matter content of the minimal supersymmetric Standard Model below the string scale M_string predict a wrong value for the weak--mixing angle sin^2\theta_W and strong coupling constant \alpha_S at the scale M_Z. To resolve this problem one needs large threshold corrections. At the same time one would like to avoid introducing new intermediate scales that are small compared to M_string. Two requests which seem to be incompatible. We show how both requirements can be satisfied in a class of (0,2) heterotic superstring compactifications with a natural choice of the vevs of the moduli fields entering the moduli dependent string threshold corrections.

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