Supersymmetry and R_b in the light of LEP 1.5

Details Supersymmetry and R_b in the light of LEP 1.5 Supersymmetry and R_b in the light of LEP 1.5

1995-12-12

arxiv.org/abs/hep-ph/9512288v1

Phys.Lett.B372:95-100,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages (LaTeX), 2 figures (uuencoded)

Scientific paper

10.1016/0370-2693(96)00058-5

We re-examine the possible magnitude of the supersymmetric contribution to $R_b\equiv\Gamma(Z^0\to\bar b b)/\Gamma(Z^0\to{\rm all})$ in the light of the constraints imposed by the absence of light charginos at LEP~1.5, implementing also other available phenomenological constraints. We find the supersymmetric contribution to be $R^{\rm susy}_b < 0.0017$, and discuss the extent to which this upper bound could be strengthened by future constraints on the chargino and top-squark masses. Such values of $R^{\rm susy}_b$ tend to disfavor a supersymmetry explanation of the apparent $R_b$ discrepancy.

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