Precision Measurements of in the Deep Inelastic Regime
Collaboration
6 pages
Published in:
- Phys.Lett.B 744 (2015) 309-314
- Published: Apr 7, 2015
e-Print:
- 1406.1207 [nucl-ex]
Report number:
- JLAB-PHY-14-1899
Citations per year
Abstract: (Elsevier)
We have performed precision measurements of the double-spin virtual-photon asymmetry A1 on the neutron in the deep inelastic scattering regime, using an open-geometry, large-acceptance spectrometer and a longitudinally and transversely polarized 3 He target. Our data cover a wide kinematic range 0.277≤x≤0.548 at an average Q2 value of 3.078 (GeV/c) 2 , doubling the available high-precision neutron data in this x range. We have combined our results with world data on proton targets to make a leading-order extraction of the ratio of polarized-to-unpolarized parton distribution functions for up quarks and for down quarks in the same kinematic range. Our data are consistent with a previous observation of an A1n zero crossing near x=0.5 . We find no evidence of a transition to a positive slope in (Δd+Δd¯)/(d+d¯) up to x=0.548 .Note:
- 6 pages, 2 figures, 3 tables. Reported results extended and slightly updated. Discussion revised •
- 6 pages, 2 figures, 3 tables. Two typos corrected in Table 3
- Spin structure functions
- Nucleon structure
- Parton distribution functions
- Polarized electron scattering
- electron nucleus: deep inelastic scattering
- helium: nuclide
- polarized beam: longitudinal
- polarized target
- spin: asymmetry
- precision measurement
References(0)
Figures(2)
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