2004/12/31 by Stephen P. Martin, Kazuhiro Tobe, James D. Wells
Mathematics · Physics and Astronomy · #Chargino #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Electroweak interaction #Gaugino #Gluino #Higgs boson #Higgsino #Mathematics #Minimal Supersymmetric Standard Model #Neutralino #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Physics #Statistics #Supersymmetry #hep-ph
paper · pdf · doi:10.1103/physrevd.71.073014
published as Phys.Rev. D71 (2005) 073014 · 22 pages, 5 figures, v2: typos fixed and note added
arxiv created 2005/04/20 · openalex publication_date 2005/04/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.