Phys. Rev. D 64, 052002 (2001) [16 pages]Improved measurement of the d̅ /ū asymmetry in the nucleon seaReceived 14 March 2001; published 10 August 2001 Measurements of the ratio of Drell-Yan yields from an 800 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 down antiquark (d̅ ) to up (ū) antiquark 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, (d̅ -ū) and ∫(d̅ -ū)dx are evaluated for 0.015<x<0.35. These results are compared with parametrizations of various parton distribution functions, models and experimental results from NA51, NMC and HERMES. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.64.052002
DOI:
10.1103/PhysRevD.64.052002
PACS:
13.85.Qk, 14.20.Dh, 14.65.Bt, 24.85.+p
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