Infrared Singularities and Soft Gluon Resummation with Massive Partons
arXiv:1006.4680 · doi:10.1016/j.nuclphysbps.2010.08.026
Abstract
Infrared divergences of QCD scattering amplitudes can be derived from an anomalous dimension matrix, which is also an essential ingredient for the resummation of large logarithms due to soft gluon emissions. We report a recent analytical calculation of the anomalous dimension matrix with both massless and massive partons at two-loop level, which describes the two-loop infrared singularities of any scattering amplitudes with an arbitrary number of massless and massive partons, and also enables soft gluon resummation at next-to-next-to-leading-logarithmic order. As an application, we calculate the infrared poles in the q qbar -> t tbar and gg -> t tbar scattering amplitudes at two-loop order.
Talk presented at Loops and Legs in Quantum Field Theory 2010, Woerlitz, Germany, April 25-30, 2010
References in corpus (12)
- Factorization constraints for soft anomalous dimensions in QCD scattering amplitudes
- The Two-loop Soft Anomalous Dimension Matrix and Resummation at Next-to-next-to Leading Pole
- The Two-loop Anomalous Dimension Matrix for Soft Gluon Exchange
- Tops from Light Quarks: Full Mass Dependence at Two-Loops in QCD
- Two-loop soft anomalous dimensions and NNLL resummation for heavy quark production
- Two-loop QED corrections to Bhabha scattering
- Two-Loop Fermionic Corrections to Heavy-Quark Pair Production: the Quark-Antiquark Channel
- Heavy-quark production in massless quark scattering at two loops in QCD
- Two-Loop Planar Corrections to Heavy-Quark Pair Production in the Quark-Antiquark Channel
- The Massive Soft Anomalous Dimension Matrix at Two Loops
- Computation of the Soft Anomalous Dimension Matrix in Coordinate Space
- tops at NLO and NNLO