期刊
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 63, NO 1
卷 63, 期 1, 页码 1-50出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ppnp.2009.02.001
关键词
Nucleon structure; Spin; QCD; Polarized parton densities; Sum rules; Duality
资金
- United States Department of Energy (DOE) [DE-FG02-96ER40960]
- Thomas Jefferson National Accelerator Facility for the DOE [DE-AC05-84ER-40150]
After the initial discovery of the so-called spin crisis in the parton model in the 1980s, a large set of polarization data in deep inelastic lepton-nucleon scattering was collected at labs like SLAC, DESY and CERN. More recently, new high precision data at large x and in the resonance region have come from experiments at Jefferson Lab. These data, in combination with the earlier ones, allow us to study in detail the polarized parton densities, the Q(2) dependence of various moments of spin structure functions, the duality between deep inelastic and resonance data, and the nucleon structure ill the valence quark region. Together with complementary data from HERMES, RHIC and COMPASS, we can put new limits on the flavor decomposition and the gluon contribution to the nucleon spin. In this report, we provide an overview of our present knowledge of the nucleon spin structure and give an outlook on future experiments. We focus in particular on the spin structure functions g(1) and g(2) of the nucleon and their moments. (C) 2009 Elsevier B.V. All rights reserved.
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