Colour structure in threshold resummation and squark-antisquark production at NLL

Abstract

We consider the resummation of soft and Coulomb gluons for pair-production processes of heavy coloured particles at hadron colliders, and discuss recent results on the construction of a basis in colour space that diagonalizes the soft function to all orders in perturbation theory and the determination of the two-loop soft anomalous dimension needed for NNLL resummations. We present results for the combined NLL resummation of soft gluon and Coulomb-gluon effects for squark-antisquark production at the LHC.

Comments: 3+1 pages, contribution to the proceedings of the 2009 Europhysics Conference on High Energy Physics (EPS-HEP 2009), 16-22 July 2009, Krakow, Poland