Virtual effects of light gauginos and Higgsinos: A precision electroweak analysis of split supersymmetry
- Physics Department, Northern Illinois University, DeKalb, Illinois 60115 (United States) and Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510 (United States)
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)
- Michigan Center for Theoretical Physics (MCTP), University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)
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.
- OSTI ID:
- 20708970
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 71, Issue 7; Other Information: DOI: 10.1103/PhysRevD.71.073014; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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