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GRK 2044
Physikalisches Institut
Albert-Ludwigs-Universität Freiburg
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Roman Kogler - The global electroweak fit to precision data

Seminar im Rahmen des Graduiertenkollegs am Mittwoch, 06. Mai 2015

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. It provided accurate predictions of free parameters of the theory, like the masses of the top quark and the Higgs boson before their discovery.

In this talk, I will present the present status of the electroweak fit. With the discovery of the Higgs boson at the LHC, all fundamental standard model parameters are experimentally determined and the fit probes the standard model to unprecedented accuracy. Very recently full electroweak two-loop calculations became available, which further improve the precision of the electroweak fit and allow for a more thorough uncertainty analysis.

The fit is used to constrain a model with modified Higgs couplings to bosons and fermions, two Higgs doublet models and dimension-6 operators. In many cases the Higgs signal strength measurements give complementary information to constraints obtained from electroweak precison observables. I will conclude with the expected precision of the fit using future measurements at the LHC and an expected e+e- collider. A detailed assessment is made of the influence of present and future experimental and theoretical sources of systematic uncertainties on the fit predictions. 

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