Improved measurement of thed¯/ūasymmetry in the nucleon sea
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Abstract
Measurements of the ratio of Drell-Yan yields from an $800 \mathrm{GeV}/c$ 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 $(\overline{d})$ to up $(\ifmmode \bar{u}\else \={u}\fi{})$ 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, $(\overline{d}\ensuremath{-}\ifmmode \bar{u}\else \={u}\fi{})$ and $\ensuremath{\int}(\overline{d}\ensuremath{-}\ifmmode \bar{u}\else \={u}\fi{})dx$ 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.
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