The LHC's impact on the global electroweak fit

May 6, 2019
3:00pm to 4:30pm

IFT Seminar Room/Red Room

Theoretical Physics, general interest
R. Kogler

IFT Seminar Room/Red Room


The global electroweak fit has a long tradition in particle physics. Over the last decades, it has been crucial in understanding the standard model and assessing its validity. The experimental input to the fit has been dominated by measurements from the LEP, SLC and Tevatron experiments. With the advent of electroweak precision measurements at the LHC, the accuracy of predictions of key parameters could be further improved. In this talk I will present an update of the global electroweak fit to latest experimental results. The fit includes new top quark and W boson mass measurements from the LHC, measurements of the weak mixing angle, and a new evaluation of the hadronic contribution to the electromagnetic coupling. I will also report on the impact of theoretical uncertainties and discuss where higher-order calculations are needed to improve the fit in the future. The electroweak data combined with measurements of the Higgs boson coupling strengths and flavour physics observables are also used to constrain parameters of two-Higgs-doublet models. An outlook of the electroweak fit with the high-luminosity LHC will be shown.