Dijet photoproduction at low $x$ at next-to-leading order and its back-to-back limit

TL;DR

This paper calculates the inclusive dijet photoproduction cross section at NLO within the CGC framework, focusing on the back-to-back limit to explore the potential recovery of TMD factorization and the role of Sudakov logarithms.

Contribution

It provides a detailed NLO calculation of dijet photoproduction in the CGC theory, emphasizing the impact of kinematical improvements on TMD factorization at low x.

Findings

Identification of large Sudakov double logarithms in the back-to-back limit

Kinematical improvements are crucial for low-x resummation

Insights into the interplay between CGC and TMD factorization

Abstract

We compute the cross section for the inclusive photoproduction of a pair of jets at next-to-leading order accuracy in the Color Glass Condensate (CGC) effective theory. The aim is to study the back-to-back limit, to investigate whether transverse momentum dependent (TMD) factorization can be recovered at this order. In particular, we focus on the large Sudakov double logarithms, which are major ingredients of the TMD evolution. Interestingly, the kinematical improvement of the low-$x$ resummation scheme turns out to be a key ingredient in the analysis.