Enhanced Supersymmetric Corrections to Top-Quark Production at the Tevatron

Abstract

We calculate the one-loop supersymmetric electroweak-like and QCD-like corrections to the top-quark pair-production cross section at the Tevatron, including the important effects of non-degenerate top-squarks and left-right top-squark mixing. The largest electroweak effects yield a negative shift in the cross section and are enhanced right below the threshold for top-quark decay into top-squark and higgsino-like neutralino, and can be as large as $-35\%$. The largest QCD effects are positive and are enhanced for light top-squark masses, and can be as large as $20\%$. Such shifts greatly exceed the present theoretical uncertainty in the Standard Model prediction, and therefore may be experimentally observable. We also explore the one-loop shifts in scenarios containing light top-squarks and higgsino-like neutralinos that have been recently proposed to explain various apparent experimental anomalies.

22 pages, LaTeX, 8 figures (included). Expanded version includes added clarifying remarks, more compact notation in some formulas, more analytical expressions (for neutralinos and charginos of general composition), and full set of Feynman diagrams. Numerical analysis unchanged

References in corpus (14)

• Experimental Signatures of Low Energy Gauge Mediated Supersymmetry Breaking
• Supersymmetric analysis and predictions based on the CDF eeγγ+ missing E_T event
• The Top Cross Section in Hadronic Collisions
• The Perturbative Resummed Series for Top Quark Production in Hadron Reactions
• Perturbative Gluon Resummation of the Top Quark Production Cross Section
• R_b and New Physics: A Comprehensive Analysis
• Implications of the reported deviations from the standard model for Z->bb and alpha_s
• The Light Higgsino-Gaugino Window
• Top-squark mixing effects in the supersymmetric electroweak corrections to top quark production at the Tevatron
• Matching the Low and High Energy Determinations of ${\alpha }_s(M_z)$ in the MSSM
• Higgsino Cold Dark Matter Motivated by Collider Data
• $R_b$ in supersymmetric models
• Detecting a Light Stop from Top Decays at the Tevatron
• Supersymmetry and R_b in the light of LEP 1.5

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