SUSY Contributions to R_b and Top Quark Decay

Abstract

Stop contributions to radiative corrections to R_b and the top quark decay are analysed over the relevant MSSM parameter space. One sees a 30 % increase in the former along with a similar drop in the latter in going from the higgsino dominated to the mixed region. Consequently one can get a viable SUSY contribution to R_b within the constraint of the top quark data only in the mixed region, corresponding to a photino dominated LSP. We discuss the phenomenological implications of this model for top quark decay and direct stop production, which can be tested with the Tevatron data.

16 pages, LaTeX, 4 figures enhanced postscript

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• Bounds on Supersymmetry from Electroweak Precision Analysis
• Stop and Sbottom Searches in Run II of the Fermilab Tevatron
• Bottom-up approach and supersymmetry breaking
• The Effective Weak Mixing Angle in the MSSM
• Supersymmetry, Supergravity and R_b revisited in the light of LEP 2
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• Supersymmetry and the spontaneous breaking of a U(1) gauge factor
• Indian Contributions to LHC Theory
• R_b in Supergravity Grand Unification with Non-universal Soft SUSY Breaking
• Electroweak interactions: a theoretical overview