Challenges in the calculation of next-to-next-to-leading order scattering processes

Abstract

We discuss the status of the next-to-next-to-leading order calculation in scattering processes, describing briefly the challenges that have been overcome and what challenges are still to be resolved.

4 pages, uses moriond.sty (included). Talk presented at the XXXVII Rencontres de Moriond, QCD and High Energy Hadronic Interactions, Les Arcs, France, 16-23 March, 2002