Leading Electroweak Two-Loop Corrections to Precision Observables in the MSSM

2002/09/25 by S. Heinemeyer, G. Weiglein · 5 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-ph

paper · pdf · doi:10.1088/1126-6708/2002/10/072

published as JHEP 0210 (2002) 072 · 33 pages, 10 figures

arxiv created 2002/09/25 · openalex publication_date 2002/10/29 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The leading electroweak MSSM two-loop corrections to the electroweak precision observables are calculated. They are obtained by evaluating the two-loop O(α_t²), O(α_t α_b), O(α_b²) contributions to the quantity Δρin the limit of heavy scalar quarks, i.e. we consider the contributions of a Two-Higgs-Doublet model with MSSM restrictions. The full analytic result for arbitrary values of the lightest CP-even Higgs boson mass is presented. The numerical effects of the leading electroweak MSSM two-loop corrections on the precision observables M_W and sin²(theta_eff) are analyzed. The electroweak two-loop contribution to M_W amounts up to -12 MeV and up to +6 10^-5 for sin²(theta_eff). The corrections from the bottom quark loops can become important for large values of tan beta. They enter with a different sign than the O(α_t²) corrections. We furthermore investigate the current sensitivity of the electroweak precision observables to the top Yukawa coupling in the SM and the MSSM. The prospects for indirectly determining this coupling at the next generation of colliders are discussed.

Citations

• Higher-order Results for Precision Observables in the Standard Model and the MSSM
• FeynHiggs1.2: Hybrid MSbar/on-shell Renormalization for the CP-even Higgs Boson Sector in the MSSM
• Errata for "The Higgs Hunter's Guide"
• Two-Loop Results for the Masses of the Neutral CP-Even Higgs Bosons in the MSSM
• Precision Observables in the MSSM: Leading Electroweak Two-loop Corrections
• Upper limit on mh in the MSSM and M-SUGRA vs. prospective reach of LEP
• Infrared singularities and massive fields
• Review of particle properties

Cited by

• Mass bounds on a very light neutralino
• Electroweak precision observables in the minimal supersymmetric standard model
• Electroweak and supersymmetric two-loop corrections to (g−2)μ
• Two-loop SUSY corrections to the anomalous magnetic moment of the muon
• Δr in the Two-Higgs-Doublet Model at full one loop level—and beyond