Two-loop massive fermionic operator matrix elements and intial state QED corrections to e^+e^- \to γ^*/Z^*

Blümlein, J.; De Freitas, A.; van Neerven, W.

Two-loop massive fermionic operator matrix elements and intial state QED corrections to e^+e^- \to γ^/Z^

Authors

Blümlein, J.

De Freitas, A.

van Neerven, W.

Description

We describe the calculation of the two--loop massive operator matrix elements for massive external fermions. These matrix elements are needed for the calculation of the $O(α^2)$ initial state radiative corrections to $e^+e^-$ annihilation into a neutral virtual gauge boson, based on the renormalization group technique.
6 pages, 16 figures, Contribution to the Proceedings of RADCOR 2007