Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 83: Elektroschwache Wechselwirkung II
T 83.7: Vortrag
Donnerstag, 22. März 2018, 18:00–18:15, Z6 - SR 1.005
Polarization and Electroweak Precision Measurements at the ILC for √s=250 GeV — •Robert Karl1,2 and Jenny List1 — 1DESY Hamburg — 2University of Hamburg
The International Linear Collider (ILC) is a planned electron-positron collider with a first stage at a center-of-mass energy of 250 GeV. Thereby, the electron beam will be polarized to 80% and the positron beam to 30%. This allows very precise measurements of Standard Model (SM) parameters, properties of the Higgs boson and unique searches for physics beyond the SM.
In particular, the ILC will provide very precise measurements of electroweak observables, aiming for up to 2 order of magnitude better precision than previously achieved. This will provide a deep insight into the chiral structure of the SM and open an additional portal to physics beyond the SM.
In this contribution, a new study at 250 GeV will be presented using a combined analysis of W- and Z-pair production, as well as single-W production and s-channel Z/γ exchange including multiple decay channels. This analysis will provide a coherent extraction of the total cross section and the left-right asymmetry for each channel, anomalous Triple Gauge Couplings and the luminosity-weighted average polarization, which is used as the absolute scale calibration of the polarization for all physics analyses.
Furthermore, systematic uncertainties (e.g. of the detector selection efficiency) including their correlations are considered in this analysis and their impact on the measurement precision of the electroweak observables will be presented.