All-order colour structure and two-loop anomalous dimension of soft radiation in heavy-particle pair production at the LHC
arXiv:1001.4621
Abstract
We consider the factorization and resummation of soft and Coulomb gluons for pair-production processes of heavy coloured particles at hadron colliders, and discuss: the construction of a colour basis that diagonalizes the leading soft function to all orders in perturbation theory; the determination of the two-loop soft anomalous dimension needed for NNLL resummations; and a general formula that provides all logarithmically enhanced O(alpha_s^2) correction requiring as process-independent input only the one-loop hard matching coefficients.
6 pages, to appear in the proceedings of the 9th International Symposium on Radiative Corrections (RADCOR 2009), October 25-30 2009, Ascona, Switzerland
References in corpus (8)
- Soft-Collinear Factorization in Effective Field Theory
- Infrared singularities of QCD amplitudes with massive partons
- Soft radiation in heavy-particle pair production: all-order colour structure and two-loop anomalous dimension
- Two-loop soft anomalous dimensions and NNLL resummation for heavy quark production
- Threshold Resummation for Top-Pair Hadroproduction to Next-to-Next-to-Leading Log
- Threshold expansion of the gg(qq) -> QQ+X cross section at O(alpha_s^4)
- Perturbative heavy quark-antiquark systems
- Colour structure in threshold resummation and squark-antisquark production at NLL