Z Pole Observables in the MSSM

TL;DR

This paper provides the most precise predictions for Z pole observables within the MSSM, incorporating comprehensive one-loop, two-loop, and higher-order corrections, and analyzes the impact of complex phases on these predictions.

Contribution

It delivers the most accurate MSSM predictions for Z pole observables by including full one-loop, two-loop, and Higgs sector corrections, along with phase effects and uncertainty estimates.

Findings

Predictions align closely with experimental data.

Complex phases significantly influence observable values.

Higher-order uncertainties are quantitatively estimated.

Abstract

We present the currently most accurate prediction of Z pole observables such as sin^2 theta_eff, Gamma_Z, R_b, R_l, and sigma^0_had in the Minimal Supersymmetric Standard Model (MSSM). We take into account the complete one-loop results including the full complex phase dependence, all available MSSM two-loop corrections as well as the full SM results. We furthermore include higher-order corrections in the MSSM Higgs boson sector, entering via virtual Higgs boson contributions. For Gamma(Z -> neutralino{1} neutralino{1}) we present a full one-loop calculation. We analyse the impact of the different sectors of the MSSM with particular emphasis on the effects of the complex phases. The predictions for the Z boson observables and M_W are compared with the current experimental values. Furthermore we provide an estimate of the remaining higher-order uncertainties in the prediction of sin^2 theta_eff.