Supersymmetry, Supergravity and R_b revisited in the light of LEP 2

Details Supersymmetry, Supergravity and R_b revisited in the light of LEP 2 Supersymmetry, Supergravity and R_b revisited in the light of LEP 2

1996-12-16

arxiv.org/abs/hep-ph/9612376v1

Phys.Lett.B397:88-93,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, LaTeX, 4 figures (included)

Scientific paper

10.1016/S0370-2693(97)00156-1

A previous study of supersymmetric models has indicated that they are unlikely to make a large contribution to R_b. We revisit this analysis, taking into account the improved lower limits on sparticle masses provided recently by LEP 2 and the Tevatron, finding that a generic supersymmetric model cannot contribute more than about one-and-a-half current experimental standard deviations to R_b. We then specialize this analysis to minimal supergravity models with universal high-energy boundary conditions, and find a much more stringent upper bound R^{susy}_b < 0.0003. We discuss in detail why such models can only attain values of R^{susy}_b that are considerably smaller even than those obtainable in more general supersymmetric models.

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