Photon impact factor in the next-to-leading order
Ian Balitsky, Giovanni A. Chirilli

TL;DR
This paper derives an analytic expression for the photon impact factor at next-to-leading order in coordinate space, advancing understanding of small-x deep inelastic scattering through operator expansion techniques.
Contribution
It provides the first analytic coordinate-space calculation of the NLO photon impact factor using Wilson line operator expansion.
Findings
Analytic NLO photon impact factor expression derived
Enhances theoretical understanding of small-x DIS processes
Facilitates more precise predictions in high-energy QCD
Abstract
An analytic coordinate-space expression for the next-to-leading order photon impact factor for small- deep inelastic scattering is calculated using the operator expansion in Wilson lines.
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