Improved Measurement of the $\bar d / \bar u$ Asymmetry in the Nucleon Sea

Details Improved Measurement of the $\bar d / \bar u$ Asymmetry in the Nucleon Sea Improved Measurement of the $\bar d / \bar u$ Asymmetry in the Nucleon Sea

2001-03-20

arxiv.org/abs/hep-ex/0103030v1

Phys.Rev.D64:052002,2001

Physics

High Energy Physics

High Energy Physics - Experiment

17 pages, 15 figures

Scientific paper

10.1103/PhysRevD.64.052002

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

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