Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 48: Eingeladene Vorträge 2

T 48.3: Semi-Invited Talk

Tuesday, March 28, 2017, 14:54–15:21, H 3

Top-Antitop Pair Production Near Threshold in Electron-Positron Annihilation — •Jan Piclum — Universität Siegen, Siegen, Germany

A future electron-positron collider like the envisioned International Linear Collider will offer the possibility to measure the cross section for the production of top-antitop quark pairs close to the production threshold with high precision. From a comparison of the measured cross section to a theoretical calculation, one can then determine properties of the top quark like its mass and decay width. This requires a precise prediction of the cross section, which makes it necessary to compute it to high order in perturbation theory. In this talk I will explain the effective theory framework that is employed in this calculation and present results at next-to-next-to-next-to-leading order in QCD. I will also discuss the inclusion of electroweak corrections, for example due to virtual Higgs bosons, which are also important at this level of precision.