QCD factorization of quasi generalized gluon distributions

• Published in: The journal of high energy physics Vol. 2023; no. 4; pp. 1 - 27
• Main Authors: Ma, J. P., Pang, Z. Y., Zhang, C. P., Zhang, G. P.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 03-04-2023; Springer Nature B.V; SpringerOpen
• Subjects: Classical and Quantum Gravitation; Elementary Particles; Factorization; Gluons; High energy physics; Invariants; Operators; Parton Distributions; Physics; Physics and Astronomy; Quantum chromodynamics; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Regular Article - Theoretical Physics; Relativity Theory; Renormalization Group; String Theory; Theoretical physics; Factorization; Renormalization Group; Parton Distributions
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP04(2023)001

A
bstract
We study the factorization relations between quasi gluon GPDs and twist-2 GPDs. The perturbative coefficient functions are obtained at one-loop level. They are free from any collinear- or I.R. divergences. Unlike the case of the factorization of quasi quark GPDs at one-loop, we have to add ghost contributions for the factorization of quasi gluon GPDs in order to obtain gauge-invariant results. In general, operators will be mixed beyond tree-level. Our work shows that the mixing pattern of the nonlocal operators in quasi gluon GPDs is the same as those of local operators, i.e., the nonlocal operators considered are mixed with gauge-invariant operators, BRST-variation operators and operators involving EOM operator. The factorization relations are obtained for all quasi gluon GPDs. Taking the forward limit, we also obtain the relations between quasi gluon PDFs and twist-2 PDFs.