Precision QCD with jet observables
Prof. Dr. Thomas Gehrmann (ETH Zürich)

Jet production observables are among the most sensitive probes of QCD at high energy colliders, where they are used for example to determine the strong coupling constant. Until recently, the interpretation of jet production data within perturbative QCD is restricted to next-to-leading (NLO) calculations, with theoretical uncertainties being considerably larger than current experimental errors. We report on the first NNLO calculation of event shapes and jet observables in electron-positron annihilation, and discuss the impact of these new results on the interpretation of percision QCD data from LEP.