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

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

paper

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

arXiv:0812.1588

Abstract

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