Improved measurement of thed¯/ūasymmetry in the nucleon sea
作者： RS Towell , PL McGaughey , TC Awes , ME Beddo , ML Brooks
DOI: 10.1103/PHYSREVD.64.052002
关键词: Nucleon 、 Deuterium 、 Physics 、 Drell–Yan process 、 Particle physics 、 Nuclear physics 、 Distribution function 、 Muon 、 Proton 、 Bar (unit) 、 Parton
摘要: Measurements of the ratio Drell-Yan yields from an $800 \mathrm{GeV}/c$ proton beam incident on liquid hydrogen and deuterium targets are reported. Approximately 360 000 muon pairs remained after all cuts data. From these data, down antiquark $(\overline{d})$ to up $(\ifmmode \bar{u}\else \={u}\fi{})$ distributions in sea is determined over a wide range Bjorken-$x.$ These results confirm previous measurements by E866 extend them lower x. $(\overline{d}\ensuremath{-}\ifmmode $\ensuremath{\int}(\overline{d}\ensuremath{-}\ifmmode \={u}\fi{})dx$ evaluated for $0.015lxl0.35.$ compared with parametrizations various parton distribution functions, models experimental NA51, NMC HERMES.
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