d/u Asymmetry in the Nucleon Sea

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Fermilab E866 has performed a precise measurement of the ratio of Drell-Yan yields from an 800 GeV/c proton beam incident on hydrogen and deuterium targets, leading to the first determinations of {bar d}/{bar u} and {bar d}-{bar u} in the proton as functions of {chi}. The results show that {bar d} > {bar u} over a broad range of {chi} and provide valuable information regarding the origins of the {bar d}/{bar u} asymmetry and the antiquark sea in the nucleon. No known symmetry requires equality of the {bar d} and {bar u} distributions in the proton. However, until recently it ... continued below

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7 pages

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Gagliardi, C. A.; Awes, T. C.; Stankus, P. W. & Young, G. R. August 24, 1998.

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Description

Fermilab E866 has performed a precise measurement of the ratio of Drell-Yan yields from an 800 GeV/c proton beam incident on hydrogen and deuterium targets, leading to the first determinations of {bar d}/{bar u} and {bar d}-{bar u} in the proton as functions of {chi}. The results show that {bar d} > {bar u} over a broad range of {chi} and provide valuable information regarding the origins of the {bar d}/{bar u} asymmetry and the antiquark sea in the nucleon. No known symmetry requires equality of the {bar d} and {bar u} distributions in the proton. However, until recently it had been generally assumed that {bar d}({chi}) {approx} {bar u}({chi}), where {chi} is the fraction of the proton's momentum (Bjorken-{chi}) carried by the antiquark, based both on the assumption that the majority of the antiquark sea in the nucleon originates from gluon splitting into q - {bar q} pairs and the lack of experimental evidence to the contrary. The first clear evidence that {bar d} {ne} {bar u} came from the NMC measurements of the structure functions F{sub 2}{sup p}({chi}) and F{sub 2}{sup n}({chi}) in deep-inelastic muon scattering on hydrogen and deuterium.

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7 pages

Notes

INIS; OSTI as DE00771522

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  • International Nuclear Physics Conference (INPC/98), Paris (FR), 08/24/1998--08/28/1998

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  • Report No.: P00-106676
  • Grant Number: AC05-00OR22725
  • Office of Scientific & Technical Information Report Number: 771522
  • Archival Resource Key: ark:/67531/metadc720226

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  • August 24, 1998

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  • Sept. 29, 2015, 5:31 a.m.

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  • Jan. 21, 2016, 1:26 p.m.

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Gagliardi, C. A.; Awes, T. C.; Stankus, P. W. & Young, G. R. d/u Asymmetry in the Nucleon Sea, article, August 24, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc720226/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.