Virtual effects of light gauginos and higgsinos: a precision electroweak analysis of split supersymmetry

Abstract

We compute corrections to precision electroweak observables in supersymmetry in the limit that scalar superpartners are very massive and decoupled. This leaves charginos and neutralinos and a Standard Model-like Higgs boson as the only states with unknown mass substantially affecting the analysis. We give complete formulas for the chargino and neutralino contributions, derive simple analytic results for the pure gaugino and higgsino cases, and study the general case. We find that in all circumstances, the precision electroweak fit improves when the charginos and neutralinos are near the current direct limits. Larger higgsino and gaugino masses worsen the fit as the theory predictions asymptotically approach those of the Standard Model. Since the Standard Model is considered by most to be an adequate fit to the precision electroweak data, an important corollary to our analysis is that all regions of parameter space allowed by direct collider constraints are also allowed by precision electroweak constraints in split supersymmetry.

22 pages, 5 figures, v2: typos fixed and note added

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• Z Pole Observables in the MSSM
• Raising the Higgs mass with Yukawa couplings for isotriplets in vector-like extensions of minimal supersymmetry
• Natural SUSY in Plain Sight
• SUSY Implications from WIMP Annihilation into Scalars at the Galactic Centre
• Electroweakino constraints from LHC data
• Supersymmetry with Light Dark Matter confronting the recent CDMS and LHC Results
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• The Higgsino-Singlino World at the Large Hadron Collider
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• Hunting long-lived gluinos at the Pierre Auger Observatory
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