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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Experimentelle Elementarteilchenphysik

Martin Grünewald (1998)

Experimental Tests of the Electroweak Standard Model at High Energies

Humboldt Universität zu Berlin.

     In recent years, a new generation of particle physics experiments explore electron-positron and
proton-antiproton collisions at centre-of-mass energies never reached before. Large detectors measure
accurately all details of the collision processes. This article reviews the wealth of precise, mostly
still preliminary measurements which are used to determine masses and coupling constants of heavy
fermions and bosons with unprecedented accuracy. The measurements are so precise that they test
the Standard Model of particle physics not only at lowest order but also at the level of its higher-
order radiative corrections, and constrain its parameters. The results of these tests of the electroweak
Standard Model, constraints on its parameters and consequences for new physics are presented.
     The main results are: the Standard Model of electroweak interactions describes successfully the
complete set of measurements. Based on the analysis of electroweak radiative corrections, the masses
of the top quark and the W boson are indirectly determined, and the results agree well with the
direct measurements. For the Standard Model Higgs boson, a small mass value is determined, with
MH < 262 GeV at 95% confidence level.