Gluon orbital angular momentum at small x
Name
PhysRevD.95.114032.pdf
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276.65 KB
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Author(s)
Hatta, Yoshitaka
Nakagawa, Yuya
Xiao, Bowen
Yuan, Feng
Zhao, Yong
Date Issued
June 2017
Journal
Physical Review D
Publisher
American Physical Society
Citation
Hatta, Yoshitaka, Yuya Nakagawa, Bowen Xiao, Feng Yuan, and Yong Zhao. "Gluon orbital angular momentum at small x." Physical Review D 95,
114032 (2017).
Version
Final published version
Abstract
We present a general analysis of the orbital angular momentum (OAM) distribution of gluons L_{g}(x) inside the nucleon with particular emphasis on the small-x region. We derive a novel operator representation of L_{g}(x) in terms of Wilson lines and argue that it is approximately proportional to the gluon helicity distribution L_{g}(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.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.95.114032
