Improved measurement of the d̄/ū asymmetry in the nucleon sea

By R. Towell, P. McGaughey, T. Awes, M. Beddo, M. Brooks, C. Brown, J. D. Bush, T. Carey, T. Chang, W. Cooper and 32 more. 2001

198 citations recorded by the source corpus.

Measurements of the ratio of Drell-Yan yields from an 800 \rm{GeV/c} proton beam incident on liquid hydrogen and deuterium targets are reported. Approximately 360,000 Drell-Yan muon pairs remained after all cuts on the data. From these data, the ratio of anti-down ($\bar{d}$) to anti-up ($\bar{u}$) quark distributions in the proton sea is determined over a wide range in Bjorken-$x$. These results confirm previous measurements by E866 and extend them to lower $x$. From these data, $(\bar{d}-\bar{u})$ and $\int(\bar{d}-\bar{u})dx$ are evaluated for $0.015<x<0.35$. These results are compared with parameterizations of various parton distribution functions, models and experimental results from NA51, NMC, and HERMES.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b6e219b2ba029f2159b7438df97089e3f4c2bb15

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In Nuclear and High Energy Physics

  1. Sven-Olaf Moch
  2. J. Blumlein
  3. S. Alekhin
  4. A. Vogt
  5. E. Reya
  6. R. Plačakytė
  7. S. Forte
  8. Maria Vittoria Garzelli

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