Speaker
Mr
Arne Weber
(MPI for Physics - Munich)
Description
LEP1 and SLC measurements provide accurate data for the process $e^+e^- \to f \bar f$
at a centre of mass energy~$s\sim M_Z^2$. This data is used to define various on
resonance pseudo observables, such as effective fermionic mixing angles, pole
asymmetries, partial and total $Z$~boson decay widths, peak cross sections, and
ratios of partial widths. Despite the fact that the experimental errors of these
quantities are already below the per mill level, the GigaZ option of a future linear
collider will further reduce these error. To match current and future experimental
accuracy, equally precise theoretical predictions are indispensable. As the theory
predictions depend on model dependent quantum corrections, the comparison of the
theory predictions with the experimental data provides a crucial test of models of
new physics.
In this talk we present the currently most precise and most general MSSM predictions
for the observables at the $Z$~resonance. These contain all relevant contributions
from Standard Model and MSSM, as well as the full dependence on the complex
parameters at one-loop order. Our calculations are performed within an unconstrained
MSSM, allowing for detailed studies within any constrained model of phenomenological
interest. Comparing our results with the current data we impose constraints on the
MSSM parameter space and analyse possible indications for the scale of supersymmetry.
We furthermore comment on the prospects and potential improvements at the future LHC
and ILC colliders.
Arne M. Weber on behalf of S. Heinemeyer, W. Hollik, AMW and G. Weiglein.
Author
Mr
Arne Weber
(MPI for Physics - Munich)
Co-authors
Dr
Georg Weiglein
(IPPP - University of Durham)
Dr
Sven Heinemeyer
(IFCA (Santander))
Prof.
Wolfgang Hollik
(MPI for Physics - Munich)
