Electroweak Precision Tests at GigaZ

By running the prospective high-energy ee collider TESLA in the GigaZ mode on the Z resonance, experiments can be performed on the basis of more than 10 Z events. This will allow the measurement of the effective electroweak mixing angle to an accuracy of δ sin θeff ≈ ±1×10. The W boson mass is likewise expected to be measurable with an error of δMW ≈ ±6 MeV near the WW threshold. We review the electroweak precision tests that can be performed with these high precision measurements within the Standard Model (SM) and its minimal Supersymmetric extension (MSSM). The complementarity of direct measurements at a prospective linear ee collider and indirect constraints following from measurements performed at GigaZ is emphasized. ∗) Talk given by S. Heinemeyer at the 5th International Linear Collider Workshop (LCWS 2000), Fermilab, Batavia, Illinois, 24-28 Oct 2000 †) email: [email protected] ‡) email: [email protected] Electroweak Precision Tests at GigaZ Sven Heinemeyer∗ and Georg Weiglein† HET, Brookhaven Natl. Lab., Upton, New York 11973, USA CERN, TH Division, CH-1211 Geneva 23, Switzerland Abstract. By running the prospective high-energy ee collider TESLA in the GigaZ mode on the Z resonance, experiments can be performed on the basis of more than 10 Z events. This will allow the measurement of the effective electroweak mixing angle to an accuracy of δ sin θeff ≈ ±1×10. The W boson mass is likewise expected to be measurable with an error of δMW ≈ ±6 MeV near the WW threshold. We review the electroweak precision tests that can be performed with these high precision measurements within the Standard Model (SM) and its minimal Supersymmetric extension (MSSM). The complementarity of direct measurements at a prospective linear ee collider and indirect constraints following from the measurements performed at GigaZ is emphasized. By running the prospective high-energy ee collider TESLA in the GigaZ mode on the Z resonance, experiments can be performed on the basis of more than 10 Z events. This will allow the measurement of the effective electroweak mixing angle to an accuracy of δ sin θeff ≈ ±1×10. The W boson mass is likewise expected to be measurable with an error of δMW ≈ ±6 MeV near the WW threshold. We review the electroweak precision tests that can be performed with these high precision measurements within the Standard Model (SM) and its minimal Supersymmetric extension (MSSM). The complementarity of direct measurements at a prospective linear ee collider and indirect constraints following from the measurements performed at GigaZ is emphasized.