Friday, April 23, 2004, 16:00
WHGA Auditorium
Prof. T. Gehrmann, Univ. Zürich
Abstract:
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. At present, 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. The extension of jet
calculations to NNLO requires various ingredients, such as two-loop
corrections to multi-leg amplitudes, multiple collinear limits of tree
amplitudes, as well as a consistent method for the numerical computation
of jet observables from NNLO parton level cross sections. We review
recent progress made on these subjects and discuss the open issues.