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

Ridder, A. Gehrmann-De; Gehrmann, T.; Glover, E. W. N.; Heinrich, G.

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

Authors

Ridder, A. Gehrmann-De

Gehrmann, T.

Glover, E. W. N.

Heinrich, G.

Description

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.
6 pages, contribution to the Proceedings of RADCOR07, Florence