10 research outputs found
Nuclear shadowing at low Q^2
We re-examine the role of vector meson dominance in nuclear shadowing at low
Q^2. We find that models which incorporate both vector meson and partonic
mechanisms are consistent with both the magnitude and the Q^2 slope of the
shadowing data.Comment: 7 pages, 2 figures; to appear in Phys. Rev.
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