Journal of High Energy Physics
We present results for the gg-part of the one-loop corrections to the recently introduced “topological charge” GPD ~F(x, q2). In particular, we give expression for its evolution kernel. To enforce strict compliance with the gauge invariance requirements, we have used on-shell states for external gluons, and have obtained identical results both in Feynman and light-cone gauges. No “zero mode” δ(x) terms were found for the twist-4 gluon GPD ~F(x, q2).
Original Publication Citation
Radyushkin, A., & Zhao, S. (2022). Parton distribution function for topological charge at one loop. Journal of High Energy Physics, 163, 1-14, Article 163. https://doi.org/10.1007/JHEP02(2022)163
Radyushkin, Anatoly and Zhao, Shuai, "Parton Distribution Function for Topological Charge at One Loop" (2022). Physics Faculty Publications. 571.