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04.02.2020 / 16:45 / Hamburg, Auditorium
Particle and Astroparticle Physics ColloquiumThe effects of O(α2) initial state QED corrections to e+e−→γ*/Z* at very high luminosity colliders
Johannes Bluemlein (DESY)
We present the recently completed O(α2) initial state corrections to the process e+e− → γ*/Z*, which is a central process at past and future high energy and high luminosity colliders for precision measurements of the properties of the Z-boson, the Higgs boson, and the top quark. We observe differences to an earlier result in the non-logarithmic contributions at O(α2). The new result leads to a 4 MeV shift in the Z width considering the lower end s0 = 4 m2τ of the radiation region, which is larger than the present accuracy. We present predictions on the radiative corrections to the central processes e+e- → γ*/Z*, e+e- → Z H and e+e- → t t planned at future colliders like the ILC, CLIC, Fcc-ee and CEPC to measure the mass and the width of the Z boson, the Higgs boson and the top quark, for which the present corrections are significant.
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