Three Dimensional Imaging of the Nucleon and Semi-Inclusive High Energy Reactions

TL;DR

This paper reviews the development of three-dimensional imaging of the nucleon using transverse momentum dependent parton distribution functions, aiming to enhance understanding of semi-inclusive high energy reactions.

Contribution

It summarizes the theoretical framework for semi-inclusive processes in terms of gauge invariant three-dimensional parton distributions and discusses recent achievements and experimental results.

Findings

Differential cross section results for semi-inclusive reactions

Azimuthal spin asymmetries in terms of TMD PDFs

Parameterizations of transverse momentum dependent distributions

Abstract

We present a short overview on the studies of transverse momentum dependent parton distribution functions of the nucleon. The aim of such studies is to provide a three dimensional imagining of the nucleon and a comprehensive description of semi-inclusive high energy reactions. By comparing with the theoretical framework that we have for the inclusive deep inelastic lepton-nucleon scattering and the one-dimensional imaging of the nucleon, we summarize what we need to do in order to construct such a comprehensive theoretical framework for semi-inclusive processes in terms of three dimensional gauge invariant parton distributions. After that, we present an overview of what we have already achieved with emphasize on the theoretical framework for semi-inclusive reactions in leading order perturbative QCD but with leading and higher twist contributions. We summarize in particular the results for the differential cross section and the azimuthal spin asymmetries in terms of the gauge invariant transverse momentum dependent parton distribution functions. We also briefly summarize the available experimental results on semi-inclusive reactions and parameterizations of transverse momentum dependent parton distributions extracted from them and make an outlook for the future studies.