# High energy behaviour of form factors

## TL;DR

This paper analyzes the high-energy behavior of form factors in QCD by solving renormalization group equations, providing predictions for higher-loop orders and exploring infrared divergence regularization methods.

## Contribution

It offers new predictions for the high-energy limits of massive and massless form factors at four- and five-loop orders, extending existing results.

## Key findings

- Predictions for four-loop massive form factors at high energy
- Predictions for five-loop massless form factors at high energy
- Extended understanding of infrared divergence regularization methods

## Abstract

We solve renormalization group equations that govern infrared divergences of massless and massive form factors. By comparing to recent results for planar massive three-loop and massless four-loop form factors in QCD, we give predictions for the high-energy limit of massive form factors at the four- and for the massless form factor at five-loop order. Furthermore, we discuss the relation which connects infrared divergences regularized dimensionally and via a small quark mass and extend results present in the literature to higher order.