Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 31: Flavour physics II

T 31.7: Talk

Tuesday, March 16, 2021, 17:30–17:45, Tf

NNLO QCD corrections to B_s mixing — •Marvin Gerlach, Ulrich Nierste, Vladyslav Shtabovenko, and Matthias Steinhauser — Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede Straße 1, 76128 Karlsruhe, Germany

Since late 1980s, when the mixing of neutral B-mesons was first observed at DESY, B-B systems are an ever growing field of interest. The experimental as well as the theoretical progress in the recent 20 years enables precise determination of key parameters, such as the width difference Δ Γ_s between B_s and B_s. The experimental uncertainty of this quantity only amounts to a few percent. The precision of the theoretical prediction, on the other hand, is currently limited by perturbative uncertainties. In this talk we give a short overview of the perturbative corrections to Δ Γ_s, including QCD corrections to contributions with effective current-current and penguin operators in the framework of Heavy Quark Expansion (HQE).