Abstract
We present results for the gg-part of the one-loop corrections to the recently introduced “topological charge” GPD \( \overset{\sim }{F} \)(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 \( \overset{\sim }{F} \)(x, q2).
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Radyushkin, A., Zhao, S. Parton distribution function for topological charge at one loop. J. High Energ. Phys. 2022, 163 (2022). https://doi.org/10.1007/JHEP02(2022)163
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DOI: https://doi.org/10.1007/JHEP02(2022)163