2008/06/27 by G. Dissertori, A. Gehrmann-De Ridder, T. Gehrmann +4 · 2 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Consistency (knowledge bases) #Cross section (physics) #Event (particle physics) #Mode (computer interface) #Neutrino Physics Research #Normalization (sociology) #Observable #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1016/j.nuclphysbps.2008.09.072
published as Nucl.Phys.Proc.Suppl.183:2-7,2008 · Contribution to the Proceedings of the 9th DESY workshop on "Loops and Legs in Quantum Field Theory", Sondershausen, April 2008
arxiv created 2008/06/27 · openalex publication_date 2008/10/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report on the calculation of NNLO corrections to the 3-jet cross section and related event shape distributions in electron-positron annihilation. The corrections are sizable for all variables, however the magnitude of the corrections is substantially different for different observables. We observe that inclusion of the NNLO corrections yields a considerably better agreement between theory and experimental data both in shape and normalization of the event shape distributions in the region where the perturbative result is expected to hold. A new extraction of αs using the event shape variables up to NNLO yields a considerably better consistency between the observables indicating a stabilization of the perturbative corrections at this order.