GigaZ: High Precision Tests of the SM and the MSSM

TL;DR

The paper discusses how the TESLA collider's GigaZ mode can precisely measure electroweak parameters, significantly improving tests of the Standard Model and MSSM, and constraining new physics scales.

Contribution

It introduces the potential of GigaZ mode at TESLA for high-precision electroweak measurements and explores their implications for Higgs mass determination and supersymmetry constraints.

Findings

Electroweak mixing angle measured to better than 10^-4 accuracy

W boson mass measurable with 6 MeV precision

Enhanced constraints on Higgs and supersymmetric particle masses

Abstract

The high-energy lepton collider TESLA can be operated in the GigaZ mode on the Z resonance, producing a billion Z bosons per year. This will allow the measurement of the effective electroweak mixing angle to an accuracy much better than one part in 10,000. Similarly, the W boson mass is expected to be measurable with an error of 6 MeV near threshold. We discuss the impact of these observables on the accuracy with which the Higgs boson mass can be determined from loop corrections within the Standard Model. We also study indirect constraints on new mass scales within the Minimal Supersymmetric Standard Model.