Heavy quark form factors at two loops in perturbative QCD

TL;DR

This paper computes heavy quark form factors at two-loop order in perturbative QCD for various currents, detailing the computational methods, renormalization, and infrared structure.

Contribution

It provides the first comprehensive two-loop calculations of heavy quark form factors for multiple currents in perturbative QCD.

Findings

Explicit two-loop form factor expressions for vector, axial-vector, scalar, and pseudo-scalar currents.

Analysis of ultraviolet renormalization procedures.

Insights into the universal infrared structure at two loops.

Abstract

We present the results for heavy quark form factors at two-loop order in perturbative QCD for different currents, namely vector, axial-vector, scalar and pseudo-scalar currents, up to second order in the dimensional regularization parameter. We outline the necessary computational details, ultraviolet renormalization and corresponding universal infrared structure.