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Title: Precision measurements of g1 of the proton and the deuteron with 6 GeV electrons

The inclusive polarized structure functions of the proton and deuteron, g1p and g1d, were measured with high statistical precision using polarized 6 GeV electrons incident on a polarized ammonia target in Hall B at Jefferson Laboratory. Electrons scattered at lab angles between 18 and 45 degrees were detected using the CEBAF Large Acceptance Spectrometer (CLAS). For the usual DIS kinematics, Q^2>1 GeV^2 and the final-state invariant mass W>2 GeV, the ratio of polarized to unpolarized structure functions g1/F1 is found to be nearly independent of Q^2 at fixed x. Significant resonant structure is apparent at values of W up to 2.3 GeV. In the framework of perturbative QCD, the high-W results can be used to better constrain the polarization of quarks and gluons in the nucleon, as well as high-twist contributions.
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Publication Date:
OSTI Identifier:
1151422
Report Number(s):
JLAB-PHY-14-1879; DOE/OR/23177-3067; arXiv:1404.6231
Journal ID: ISSN 0556--2813
DOE Contract Number:
AC05-84ER-40150
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.C; Journal Volume: 90; Journal Issue: 02
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Energy Research (ER)
Country of Publication:
United States
Language:
English