Calculation of QCD loops using tree-level matrix elements

Abstract

The possibility of treating colour in one-loop amplitude calculations alike the other quantum numbers is briefly discussed for semi-numerical algorithms based on generalized unitarity and parametric integration techniques. Numerical results are presented for the calculation of virtual corrections in multi-gluon scattering.

Comments: 4 pages, 3 figures. Presented at the 45th Rencontres de Moriond, Workshop on QCD and High Energy Interactions, March 13-20, 2010, La Thuile, Italy