Gluon orbital angular momentum at small x

Gluon orbital angular momentum at small x We present a general analysis of the orbital angular momentum (OAM) distribution of gluons Lg(x) inside the nucleon with particular emphasis on the small-x region. We derive a novel operator representation of Lg(x) in terms of Wilson lines and argue that it is approximately proportional to the gluon helicity distribution Lg(x)≈-2ΔG(x) at small x. 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Gluon orbital angular momentum at small x

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Gluon orbital angular momentum at small x

Abstract

We present a general analysis of the orbital angular momentum (OAM) distribution of gluons Lg(x) inside the nucleon with particular emphasis on the small-x region. We derive a novel operator representation of Lg(x) in terms of Wilson lines and argue that it is approximately proportional to the gluon helicity distribution Lg(x)≈-2ΔG(x) at small x. 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.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
1550-7998
eISSN
1550-2368
D.O.I.
10.1103/PhysRevD.95.114032
Publisher site
See Article on Publisher Site

Abstract

We present a general analysis of the orbital angular momentum (OAM) distribution of gluons Lg(x) inside the nucleon with particular emphasis on the small-x region. We derive a novel operator representation of Lg(x) in terms of Wilson lines and argue that it is approximately proportional to the gluon helicity distribution Lg(x)≈-2ΔG(x) at small x. 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.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Jun 1, 2017

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