Prediction for $α_3(M_z)$ in a string-inspired model

Details Prediction for $α_3(M_z)$ in a string-inspired model Prediction for $α_3(M_z)$ in a string-inspired model

1999-04-10

arxiv.org/abs/hep-ph/9904293v2

Phys.Lett. B459 (1999) 540-548

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, LaTeX, 3 figures

Scientific paper

10.1016/S0370-2693(99)00695-4

We apply the Renormalisation Group Evolution (RGE) to analyze the phenomenological implications of an extended supersymmetric model, for the value of the unification scale and the strong coupling at the electroweak scale. The model we consider is predicted to exist in Calabi-Yau string compactifications with Wilson line mechanism for $E_6$ symmetry breaking, contains additional matter beyond the MSSM spectrum and avoids the ``doublet-triplet'' splitting problem in the Higgs sector. The calculation is analytical in two-loop order and includes the effects of the heavy thresholds due to the additional matter considered. The value of $\alpha_3(M_z)$ can be brought within the experimental limits without a significant change of the unification scale from the MSSM prediction.

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