Event shapes in $e^+e^-$ annhilation at NNLO

Authors :: Ridder, A. Gehrmann-De
Gehrmann, T.
Glover, E. W. N.
Heinrich, G.
Publication Year :: 2008
Publisher :: arXiv, 2008.
Abstract: We report first results on the calculation of NNLO corrections to event shape distributions in electron-positron annhilation. The corrections are sizeable for all variables, however their magnitude 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 normalisation of the event shape distributions.<br />Comment: 6 pages, contribution to the Proceedings of RADCOR07, Florence