Quark and gluon TMD correlators in momentum and coordinate space
Abstract
Transverse momentum dependent (TMD) distribution correlators can be parametrized in terms of TMD parton distribution functions (PDFs), or TMDs for short. We provide an overview of the leading-twist quark and gluon TMDs, both in momentum space and in coordinate space (also called bT-space, where bT is Fourier conjugate to the partonic momentum kT). We consider unpolarized, vector polarized, as well as tensor polarized hadrons, which is relevant for spin-0, spin-1/2, and spin-1 hadrons.
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