Improved measurement of the (d)over-bar/(u)over-bar asymmetry in the nucleon sea - art. no. 052002

Citation
Rs. Towell et al., Improved measurement of the (d)over-bar/(u)over-bar asymmetry in the nucleon sea - art. no. 052002, PHYS REV D, 6405(5), 2001, pp. 2002
Citations number
68
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
0556-2821 → ACNP
Volume
6405
Issue
5
Year of publication
2001
Database
ISI
SICI code
0556-2821(20010901)6405:5<2002:IMOT(A>2.0.ZU;2-5
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. Approximat ely 360 000 Drell-Yan muon pairs remained after all cuts on the data. From these data, the ratio of down antiquark ((d) over bar) to up ((u) over bar) antiquark distributions in the proton sea is determined over a wide range in Bjorken-x. These results confirm previous measurements by E866 and exten d them to lower x. From these data, ((d) over bar-(u) over bar) and integra l((d) over bar-(u) over bar )dx are evaluated for 0.015<x<0.35. These resul ts are compared with parametrizations of various par-ton distribution funct ions, models and experimental results from NA51, NMC and HERMES.