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Type: Journal article
Title: Spin-dependent structure functions in nuclear matter and the polarized EMC effect
Author: Cloet, I.
Bentz, W.
Thomas, A.
Citation: Physical Review Letters, 2005; 95(5):052302-1-052302-4
Publisher: American Physical Soc
Issue Date: 2005
ISSN: 0031-9007
Organisation: Special Research Centre for the Subatomic Structure of Matter
Statement of
I. C. Cloët, W. Bentz, and A. W. Thomas
Abstract: An excellent description of both spin-independent and spin-dependent quark distributions and structure functions has been obtained with a modified Nambu—Jona-Lasinio model, which is free of unphysical thresholds for nucleon decay into quarks—hence incorporating an important aspect of confinement. We utilize this model to investigate nuclear medium modifications to structure functions and find that we are readily able to reproduce both nuclear matter saturation and the experimental F/F2N ratio, that is, the European Muon Collaboration (EMC) effect. Applying this framework to determine g, we find that the ratio g/g1p differs significantly from unity, with the quenching caused by the nuclear medium being about twice that of the spin-independent case. This represents an exciting result, which, if confirmed experimentally, will reveal much about the quark structure of nuclear matter.
Rights: ©2005 American Physical Society
DOI: 10.1103/PhysRevLett.95.052302
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Special Research Centre for the Subatomic Structure of Matter publications

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