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arXiv · 1910.13963

Gluon Pseudo-Distributions at Short Distances: Forward Case

Ian Balitsky·Wayne Morris·Anatoly Radyushkin
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Abstract

We present the results that are necessary in the ongoing lattice calculations of the gluon parton distribution functions (PDFs) within the pseudo-PDF approach. We give a classification of possible two-gluon correlator functions and identify those that contain the invariant amplitude determining the gluon PDF in the light-cone $z^2 \to 0$ limit. One-loop calculations have been performed in the coordinate representation and in an explicitly gauge-invariant form. We made an effort to separate ultraviolet (UV) and infrared (IR) sources of the $\ln (-z^2)$-dependence at short distances $z^2$. The UV terms cancel in the reduced Ioffe-time distribution (ITD), and we obtain the matching relation between the reduced ITD and the light-cone ITD. Using a kernel form, we get a direct connection between lattice data for the reduced ITD and the normalized gluon PDF. We also show that our results may be used for a rather straightforward calculation of the one-loop matching relations for quasi-PDFs.

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Ian Balitsky, Wayne Morris, Anatoly Radyushkin. 2021-07-20. Gluon Pseudo-Distributions at Short Distances: Forward Case. https://doi.org/10.1016/j.physletb.2020.135621

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