Constraints on the large-x d/u ratio from electron--nucleus scattering at x>1

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Recently the ratio of neutron to proton structure functions F{sub 2}{sup n}/F{sub 2}{sup p} was extracted from a phenomenological correlation between the strength of the nuclear EMC effect and inclusive electron-nucleus cross section ratios at x > 1. Within conventional models of nuclear smearing, this 'in-medium correction' (IMC) extraction constrains the size of nuclear effects in the deuteron structure functions, from which the neutron structure function F{sub 2}{sup n} is usually extracted. The IMC data determine the resulting proton d/u quark distribution ratio, extrapolated to x = 1, to be 0.23 {+-} 0.09 with a 90% confidence level. This is ... continued below

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117501 (4 pages)

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O. Hen, A. Accardi, W. Melnitchouk and E. Piasetzky December 1, 2011.

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Recently the ratio of neutron to proton structure functions F{sub 2}{sup n}/F{sub 2}{sup p} was extracted from a phenomenological correlation between the strength of the nuclear EMC effect and inclusive electron-nucleus cross section ratios at x > 1. Within conventional models of nuclear smearing, this 'in-medium correction' (IMC) extraction constrains the size of nuclear effects in the deuteron structure functions, from which the neutron structure function F{sub 2}{sup n} is usually extracted. The IMC data determine the resulting proton d/u quark distribution ratio, extrapolated to x = 1, to be 0.23 {+-} 0.09 with a 90% confidence level. This is well below the SU(6) symmetry limit of 1/2 and significantly above the scalar diquark dominance limit of 0.

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117501 (4 pages)

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  • Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology; Journal Volume: 84; Journal Issue: 11

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  • Report No.: JLAB-THY-11-1447
  • Report No.: DOE/OR/23177-1867
  • Report No.: arXiv:1110.2419
  • Grant Number: AC05-06OR23177
  • DOI: 10.1103/PhysRevD.84.117501 | External Link
  • Office of Scientific & Technical Information Report Number: 1033511
  • Archival Resource Key: ark:/67531/metadc836333

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 1, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 6:21 p.m.

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O. Hen, A. Accardi, W. Melnitchouk and E. Piasetzky. Constraints on the large-x d/u ratio from electron--nucleus scattering at x>1, article, December 1, 2011; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc836333/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.