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Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 1: QCD and electroweak interactions (theory)

T 1.8: Vortrag

Montag, 15. März 2021, 17:45–18:00, Ta

Mixed NNLO QCD×electroweak corrections of O(Nfαsα) to single-W/Z production at the LHC — •Jan Schwarz1, Stefan Dittmaier1, and Timo Schmidt21Albert-Ludwigs-Universität Freiburg — 2Universität Würzburg

Owing to its clean experimental signature and its high cross section the Drell–Yan-like W/Z production is among the most important processes at the LHC. Drell–Yan-like processes can be used for a variety of applications, e.g., for detector calibration or measuring the W-boson mass and beyond that are also an important SM background for searches of new physics. On the theoretical side the Osα) corrections seem to be the largest missing fixed order part, and in recent years it has been possible to get a handle on these corrections in the vicinity of the pole corresponding to the on-shell production of Drell–Yan-like W/Z bosons using, e.g., so-called pole approximations (PA). However, since new physics like the production of Z′ or W′ might show up for example in the tails of invariant mass spectra, the theoretical uncertainty on the SM background has to be controlled in these off-shell regions of phase space where the PA is not applicable. Therefore, a full off-shell calculation of the Osα) corrections is desirable. In this talk we present results on the radiative corrections of order O(Nfαsα) for the off-shell production of W or Z bosons at the LHC, where Nf is the number of fermion flavours. These corrections form a gauge-invariant part of the next-to-next-to-leading-order corrections of mixed QCD×EW type and include all diagrams at Osα) with closed fermion loops.

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