Improved measurement of the d¯/ū asymmetry in the nucleon sea
Abstract
Measurements of the ratio of Drell-Yan yields from an 800 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 (d¯) to up (ū) 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, (d¯-ū) and ∫(d¯-ū)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.
- Publication:
-
Physical Review D
- Pub Date:
- September 2001
- DOI:
- arXiv:
- arXiv:hep-ex/0103030
- Bibcode:
- 2001PhRvD..64e2002T
- Keywords:
-
- 13.85.Qk;
- 14.20.Dh;
- 14.65.Bt;
- 24.85.+p;
- Inclusive production with identified leptons photons or other nonhadronic particles;
- Protons and neutrons;
- Light quarks;
- Quarks gluons and QCD in nuclei and nuclear processes;
- High Energy Physics - Experiment
- E-Print:
- 17 pages, 15 figures