The strong coupling, unification, and recent data

Details The strong coupling, unification, and recent data The strong coupling, unification, and recent data

1995-03-02

arxiv.org/abs/hep-ph/9503214v1

Phys.Rev. D52 (1995) 3081-3086

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, LaTex + RevTex, uuencoded postscript file (including 13 figures) is attached. Also available at ftp://dept.physics.u

Scientific paper

10.1103/PhysRevD.52.3081

The prediction of the strong coupling assuming (supersymmetric) coupling constant unification is reexamined. We find, using the new electroweak data, $\alpha_{s}(M_{Z}) \approx 0.129 \pm 0.010$. The implications of the large $\alpha_{s}$ value are discussed. The role played by the $Z$ beauty width is stressed. It is also emphasized that high-energy (but not low-energy) corrections could significantly diminish the prediction. However, unless higher-dimension operators are assumed to be suppressed, at present one cannot place strong constraints on the super-heavy spectrum. Non-leading electroweak threshold corrections are also discussed.

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