Physics of the Gluon-Helicity Contribution to Proton Spin

Xiangdong Ji, Jian-Hui Zhang, and Yong Zhao
Phys. Rev. Lett. 111, 112002 – Published 10 September 2013

Abstract

The total gluon helicity in a polarized proton, measurable in high-energy scattering, is shown to be the large momentum limit of a gauge-invariant but nonlocal, frame-dependent gluon spin E×A in QCD. This opens a door for a nonperturbative calculation of this quantity in lattice QCD and also justifies using free-field expressions in the light-cone gauge as physical observables.

  • Figure
  • Received 3 April 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.112002

© 2013 American Physical Society

Authors & Affiliations

Xiangdong Ji1,2,3, Jian-Hui Zhang1, and Yong Zhao3

  • 1INPAC, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
  • 2Center for High-Energy Physics, Peking University, Beijing 100080, People’s Republic of China
  • 3Maryland Center for Fundamental Physics, University of Maryland, College Park, Maryland 20742, USA

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Issue

Vol. 111, Iss. 11 — 13 September 2013

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