Improved measurement of the {ovr d}/{ovr u} asymmetry in the nucleon sea.
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 ({bar d}) to up ({bar u}) 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, ({bar d}-{bar u}) and {integral}({bar d}-{bar u})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.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 943279
- Report Number(s):
- ANL/PHY/JA-38831
- Journal Information:
- Phys. Rev. D, Journal Name: Phys. Rev. D Journal Issue: 5 ; Sep. 1, 2001 Vol. 64; ISSN 1550-7998
- Country of Publication:
- United States
- Language:
- ENGLISH
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