Strong coupling unification and extra dimensions

Details Strong coupling unification and extra dimensions Strong coupling unification and extra dimensions

1999-03-18

arxiv.org/abs/hep-ph/9903400v2

Nucl.Phys.B559:235-254,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, Latex2e, 5 figures, new refs, figure corrected

Scientific paper

10.1016/S0550-3213(99)00440-X

We analyze the implications of electroweak and strong coupling unification in a very general class of models extending the minimal supersymmetric standard model in $4+p$ dimensions $(p\geq 0)$. In general, electroweak precision data require the presence of large extra dimensions (low compactification scales, $M_c$) and/or low unification scale, $M_U$. In particular, the actual experimental value of the strong coupling at $M_Z$ imposes an upper bound on the compactification and unification scales. In four dimensional theories ($M_c\simeq M_U$) with canonical hypercharge assignment we find $M_U\lesssim 10^{9}$ GeV. In theories with extra dimensions ($M_c

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