Theory Colloquium

QCD resummation for hadronic scattering

by Werner Vogelsang (Tuebingen U.)

Europe/Berlin
build. 2a, SR 2 (DESY Hamburg)

build. 2a, SR 2

DESY Hamburg

Description
Cross sections for the production of jets or identified hadrons in pp collisions play an important role in particle physics. At colliders, jets are involved in many reactions sensitive to new physics and their backgrounds. In lower-energy collisions, produced hadrons probe the inner structure of the nucleon and the fragmentation process. Both observables have in common that their use crucially relies on our ability to do precision computations of the underlying hard-scattering reactions in QCD perturbation theory. In this talk, we discuss the role of higher-order QCD corrections to these reactions. Specifically, we address the resummation of large logarithmic "threshold" corrections to the relevant partonic cross sections. Among other things, this allows us to determine approximate next-to-next-to-leading order QCD corrections to jet production at the LHC and Tevatron. Phenomenological studies are presented.