MSSM precision physics at the Z resonance

TL;DR

This paper reviews the most precise theoretical predictions of Z resonance observables within the MSSM, crucial for interpreting future high-precision measurements at colliders like ILC.

Contribution

It provides comprehensive one-loop and two-loop MSSM calculations of Z pole observables, incorporating complex phases and Standard Model effects, to match upcoming experimental precision.

Findings

Complete one-loop MSSM predictions with phase dependence

Inclusion of all relevant two-loop MSSM corrections

Alignment with expected experimental accuracies for indirect new physics bounds

Abstract

LEP and SLC provide accurate data on the process (e^+e^- -> f bar f) at the Z resonance. The GigaZ option at a future linear e^+e^- collider (ILC) will further improve these measurements. As a consequence, theory predictions with sufficiently smaller errors are necessary in order to fully exploit the experimental accuracies and to derive indirect bounds on the scales of new physics. Here we review the currently most accurate predictions of the Z pole observables (e.g. sin^2 theta_eff, Gamma_Z, sigma^0_had) in the context of the Minimal Supersymmetric Standard Model (MSSM). These predictions contain the complete one-loop results including the full complex phase dependence, all available MSSM two-loop corrections, as well as all relevant Standard Model contributions.