A Global Analysis of DIS Data at Small-x with Running Coupling BK Evolution

TL;DR

This paper performs a comprehensive analysis of small-x DIS data using the running coupling BK equation, fitting F_2 data and predicting F_L in the LHeC range, advancing understanding of gluon saturation effects.

Contribution

It provides a global fit to small-x structure function data with the BK equation including running coupling, and makes parameter-free predictions for F_L at future colliders.

Findings

Successfully fits F_2 data across a wide Q^2 range at small-x

Reproduces existing F_L data without additional parameters

Predicts F_L behavior for upcoming collider experiments

Abstract

We present a global fit to the structure function F_2 measured in lepton-proton experiments at small values of Bjorken-x, x< 0.01, for all experimentally available values of Q^2, 0.045< Q^2 < 800 GeV^2, using the Balitsky -Kovchegov equation including running coupling corrections. Using our fits to F_2, we reproduce available data for F_L and perform predictions, parameter-free and completely driven by small-x evolution, to the kinematic range relevant for the LHeC.