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A spectator-model way to transverse-momentum-dependent gluon distribution functions

Alessandro Bacchetta, Francesco Giovanni Celiberto, Marco Radici, Pieter Taels

SciPost Phys. Proc. 8, 040 (2022) · published 12 July 2022

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We present exploratory analyses of the 3D gluon content of the proton via a study of unpolarized and polarized gluon TMDs at twist-2, calculated in a spectator model for the parent nucleon. Our approach embodies a flexible parametrization for the spectator-mass function, suited to describe both moderate and small-$x$ effects. All these studies can serve as a useful guidance in the investigation of the gluon dynamics inside nucleons and nuclei, which constitutes one of the major goals of new-generation colliding machines, as the EIC, the HL-LHC, NICA, and the FPF.

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