Non-global Structure of the O(α_s^2) Dijet Soft Function

Andrew Hornig; Christopher Lee; Iain W. Stewart; Jonathan R. Walsh; Saba Zuberi

Paper

Non-global Structure of the O(α_s^2) Dijet Soft Function

Abstract

High energy scattering processes involving jets generically involve matrix elements of light- like Wilson lines, known as soft functions. These describe the structure of soft contributions to observables and encode color and kinematic correlations between jets. We compute the dijet soft function to O(α_s^2) as a function of the two jet invariant masses, focusing on terms not determined by its renormalization group evolution that have a non-separable dependence on these masses. Our results include non-global single and double logarithms, and analytic results for the full set of non-logarithmic contributions as well. Using a recent result for the thrust constant, we present the complete O(α_s^2) soft function for dijet production in both position and momentum space.