Toward twist-2 $T$-odd transverse-momentum-dependent gluon distributions: the $f$-type linearity function

Abstract

We present preliminary results on the leading-twist transverse-momentum-dependent (TMD) gluon linearity function, which is directly connected to nucleon transverse-spin asymmetries originating from the density of linearly-polarized gluons. The function is calculated in a spectator-model framework for the parent proton and for the $f$-type gauge-link structure. Our work represents a further step toward the definition of a complete set of gluon TMD distributions at twist-2 that can be used to access the gluon dynamics inside nucleons and nuclei at new-generation colliders.

Comments: 5 pages, 1 figure. Presented by F.G. Celiberto at the 22nd Particles and Nuclei International Conference (PANIC2021), 5-10 September 2021; version accepted for publication in the conference proceedings by PoS