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Gluon orbital angular momentum at small x

  • Author(s): Hatta, Y
  • Nakagawa, Y
  • Xiao, B
  • Yuan, F
  • Zhao, Y
  • et al.
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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