Phys. Rev. Lett. 78, 610 - 613 (1997)Gauge-Invariant Decomposition of Nucleon Spin |
Xiangdong Ji
Center for Theoretical Physics, Laboratory for Nuclear Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
and Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195
Received 20 March 1996
I introduce a gauge-invariant decomposition of the nucleon spin into quark helicity, quark orbital, and gluon contributions. The total quark (and hence the quark orbital) contribution is shown to be measurable through virtual Compton scattering in a special kinematic region where single quark scattering dominates. This deeply virtual Compton scattering has much potential to unravel the quark and gluon structure of the nucleon.
©1997 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v78/p610
DOI: 10.1103/PhysRevLett.78.610
PACS: 13.88.+e, 12.38.Aw, 13.60.Hb, 14.20.Dh
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