Gluon orbital angular momentum at small-$x$
Abstract
We present a general analysis of the orbital angular momentum (OAM) distribution of gluons inside the nucleon with particular emphasis on the small- region. We derive a novel operator representation of in terms of Wilson lines and argue that it is approximately proportional to the gluon helicity distribution at small-. We also compute longitudinal single spin asymmetry in exclusive diffractive dijet production in lepton-nucleon scattering in the next-to-eikonal approximation and show that the asymmetry is a direct probe of the gluon helicity/OAM distribution as well as the QCD odderon exchange.
Cite
@article{arxiv.1612.02445,
title = {Gluon orbital angular momentum at small-$x$},
author = {Yoshitaka Hatta and Yuya Nakagawa and Bowen Xiao and Feng Yuan and Yong Zhao},
journal= {arXiv preprint arXiv:1612.02445},
year = {2017}
}
Comments
22 pages. v2 significantly expands the previous version with all the details of derivation as well as a number of new results and discussions. The title and abstract are changed, and an author is added