Precision Observables in the MSSM: Leading Electroweak Two-loop Corrections

2001/02/26 by S. Heinemeyer, Heinemeyer, S., G. Weiglein +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0102317

13 pages, 6 figures

arxiv created 2001/02/26 · openalex publication_date 2001/02/26 · 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 ρ-parameter are calculated. They are obtained by evaluating the two-loop self-energies of the Z and the W boson at O(Gf² m_t⁴) in the limit of heavy scalar quarks. A very compact expression is derived, depending on the ratio of the CP-odd Higgs boson mass, M_A, and the top quark mass, m_t. Expressions for the limiting cases M_A >> m_t and M_A << m_t are also given. The decoupling of the non-SM contribution in the limit M_A -> oo is verified at the two-loop level. The numerical effect of the leading electroweak MSSM two-loop corrections is analyzed in comparison with the leading corrections of O(Gf² m_t⁴) in the SM and with the O(alpha alpha_s) corrections in the MSSM.

Related

• Two-loop contributions to electroweak precision observables in the MSSM
• Higher-order Results for Precision Observables in the Standard Model and the MSSM
• Results for Precision Observables in the Electroweak Standard Model at Two-Loop Order and Beyond
• Two-loop calculations in the MSSM
• QCD Corrections to Electroweak Precision Observables in SUSY Theories