Improved measurement of the (d)over-bar/(u)over-bar asymmetry in the nucleon sea
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Measurements of the ratio of Drell-Yan yields from an (Formula presented) 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 (Formula presented) to up (Formula presented) antiquark distributions in the proton sea is determined over a wide range in Bjorken-(Formula presented) These results confirm previous measurements by E866 and extend them to lower x. From these data, (Formula presented) and (Formula presented) are evaluated for (Formula presented) 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.