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

被引：0
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作者：
Towell, RS [1 ]
McGaughey, PL
Awes, TC
Beddo, ME
Brooks, ML
Brown, CN
Bush, JD
Carey, TA
Chang, TH
Cooper, WE
Gagliardi, CA
Garvey, GT
Geesaman, DF
Hawker, EA
He, XC
Isenhower, LD
Kaplan, DM
Kaufman, SB
Kirk, PN
Koetke, DD
Kyle, G
Lee, DM
Lee, WM
Leitch, MJ
Makins, N
Moss, JM
Mueller, BA
Nord, PM
Papavassiliou, V
Park, BK
Peng, JC
Petitt, G
Reimer, PE
Sadler, ME
Sondheim, WE
Stankus, PW
Thompson, TN
Tribble, RE
Vasiliev, MA
Wang, YC
Wang, ZF
Webb, JC
Willis, JL
Wise, DK
Young, GR
机构：
[1] Abilene Christian Univ, Abilene, TX 79699 USA
[2] Argonne Natl Lab, Argonne, IL 60439 USA
[3] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA
[4] Georgia State Univ, Atlanta, GA 30303 USA
[5] IIT, Chicago, IL 60616 USA
[6] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[7] Louisiana State Univ, Baton Rouge, LA 70803 USA
[8] New Mexico State Univ, Las Cruces, NM 88003 USA
[9] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
[10] Texas A&M Univ, College Stn, TX 77843 USA
[11] Valparaiso Univ, Valparaiso, IN 46383 USA
来源：
PHYSICAL REVIEW D | 2001年 / 64卷 / 05期
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中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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) 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 extend them to lower x. From these data, ((d) over bar-(u) over bar) and integral((d) over bar-(u) over bar )dx are evaluated for 0.015<x<0.35. These results are compared with parametrizations of various par-ton distribution functions, models and experimental results from NA51, NMC and HERMES.
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