One-Loop Splitting Amplitudes in Gauge Theory

TL;DR

This paper recalculates one-loop splitting amplitudes in gauge theory using unitarity methods, providing results useful for two-loop calculations and summarizing one-loop behavior in soft and collinear limits.

Contribution

It introduces a new computation of one-loop splitting functions in gauge theory with results tailored for higher-order loop calculations.

Findings

Recomputed one-loop splitting functions using unitarity-based methods.

Provided a form suitable for two-loop amplitude calculations.

Summarized one-loop behavior in soft and collinear limits.

Abstract

We recompute the functions describing the collinear factorization of one-loop amplitudes using the unitarity-based method. We present the results in a form suitable for use as an ingredient in two-loop calculations. We also present a function summarizing the behavior at one loop in both the soft and collinear limits.