Measurement of the light quark flavor asymmetry in the nucleon sea.

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Fermilab experiment E866 has performed a precision measurement of the ratio of Drell-Yan yields from 800 GeV/c protons incident on deuterium and hydrogen targets. The measurement is used to determine the ratio of down antiquarks({bar d}) to up antiquarks({bar u}) in the proton over a broad range in the fraction of the proton momentum carried by the antiquark, 0.02 < x < 0.345. For x < 0.15, the data is in reasonable agreement with pre-existing parton distributions while for x > 0.20 the data is much closer to unity than these parton functions had indicated. The light quark asymmetry provides ... continued below

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14 p.

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Awes, T. C.; Beddo, M. E.; Brown, C. N.; Bush, J. D.; Collaboration, FNAL E866 /NuSea; Geesaman, D. F. et al. June 25, 1999.

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Fermilab experiment E866 has performed a precision measurement of the ratio of Drell-Yan yields from 800 GeV/c protons incident on deuterium and hydrogen targets. The measurement is used to determine the ratio of down antiquarks({bar d}) to up antiquarks({bar u}) in the proton over a broad range in the fraction of the proton momentum carried by the antiquark, 0.02 < x < 0.345. For x < 0.15, the data is in reasonable agreement with pre-existing parton distributions while for x > 0.20 the data is much closer to unity than these parton functions had indicated. The light quark asymmetry provides valuable information on the relative role perturbative and non-perturbative mechanisms play in generating the nucleon sea. A proposal to extend the Drell-Yan measurement to higher values of x using 120 GeV protons from the Fermilab main injector will be discussed.

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14 p.

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OSTI as DE00011867

Medium: P; Size: 14 pages

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  • EPIC '99 Workshop, Bloomington, IN (US), 04/08/1999--04/11/1999

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  • Report No.: ANL/PHY/CP-99361
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11867
  • Archival Resource Key: ark:/67531/metadc620683

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  • June 25, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 2:31 p.m.

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Awes, T. C.; Beddo, M. E.; Brown, C. N.; Bush, J. D.; Collaboration, FNAL E866 /NuSea; Geesaman, D. F. et al. Measurement of the light quark flavor asymmetry in the nucleon sea., article, June 25, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc620683/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.