Identification of Observables for Quark and Gluon Orbital Angular Momentum
High Energy Physics - Phenomenology
2014-12-02 v1
Abstract
A new debate has recently arisen on the subject of orbital angular momentum in QCD, in particular on its observability and on its partonic interpretation. Orbital momentum can be defined in QCD using two different decomposition schemes that yield a kinetic and a canonical definition, respectively. We argue that kinetic orbital angular momentum is intrinsically associated with twist three generalized parton distributions, and it is therefore more readily observable, while, due to parity constraints, canonical angular momentum, if defined as suggested in the literature in terms of generalized transverse momentum distributions, cannot be observed in scattering processes involving a single hadronic reaction plane.
Keywords
Cite
@article{arxiv.1412.0647,
title = {Identification of Observables for Quark and Gluon Orbital Angular Momentum},
author = {Aurore Courtoy and Gary R. Goldstein and J. Osvaldo Gonzalez Hernandez and Simonetta Liuti and Abha Rajan},
journal= {arXiv preprint arXiv:1412.0647},
year = {2014}
}
Comments
9 pages, 4 figures