Infrared singularities of scattering amplitudes in perturbative QCD - High Energy Physics - PhenomenologyReport as inadecuate




Infrared singularities of scattering amplitudes in perturbative QCD - High Energy Physics - Phenomenology - Download this document for free, or read online. Document in PDF available to download.

Abstract: An exact formula is derived for the infrared singularities of dimensionallyregularized scattering amplitudes in massless QCD with an arbitrary number oflegs, valid at any number of loops. It is based on the conjecture that theanomalous-dimension matrix of n-jet operators in soft-collinear effectivetheory contains only a single non-trivial color structure, whose coefficient isthe cusp anomalous dimension of Wilson loops with light-like segments. Itscolor-diagonal part is characterized by two anomalous dimensions, which areextracted to three-loop order from known perturbative results for the quark andgluon form factors. This allows us to predict the three-loop coefficients ofall 1-epsilon^k poles for an arbitrary n-parton scattering amplitudes,generalizing existing two-loop results.



Author: Thomas Becher Fermilab, Matthias Neubert Uni Mainz

Source: https://arxiv.org/







Related documents