17 research outputs found
Improved Measurement of the Asymmetry in the Nucleon Sea
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 () to anti-up ()
quark distributions in the proton sea is determined over a wide range in
Bjorken-. These results confirm previous measurements by E866 and extend
them to lower . From these data, and
are evaluated for . These results are
compared with parameterizations of various parton distribution functions,
models and experimental results from NA51, NMC, and HERMES.Comment: 17 pages, 15 figure