Measurement of the light antiquark flavor asymmetry in the nucleon sea

被引：375

作者：

Hawker, EA ^{[1
]}

Awes, TC

Beddo, ME

Brown, CN

Bush, JD

Carey, TA

Chang, TH

Cooper, WE

Gagliardi, CA

Garvey, GT

Geesaman, DF

He, XC

Isenhower, LD

Kaufman, SB

Kaplan, DM

Kirk, PN

Koetke, DD

Kyle, G

Lee, DM

Lee, WM

Leitch, MJ

Makins, N

McGaughey, PL

Moss, JM

Mueller, BA

Nord, PM

Park, BK

Papavassiliou, V

Peng, JC

Petitt, G

Reimer, PE

Sadler, ME

Selden, J

Stankus, PW

Sondheim, WE

Thompson, TN

Towell, RS

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] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[3] Georgia State Univ, Atlanta, GA 30303 USA

[4] IIT, Chicago, IL 60616 USA

[5] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[6] Louisiana State Univ, Baton Rouge, LA 70803 USA

[7] New Mexico State Univ, Las Cruces, NM 88003 USA

[8] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[9] Texas A&M Univ, College Stn, TX 77843 USA

[10] Valparaiso Univ, Valparaiso, IN 46383 USA

[11] Argonne Natl Lab, Argonne, IL 60439 USA

[12] Univ Texas, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.80.3715

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A precise measurement of the ratio of Drell-Yan yields from an 800 GeV/c proton beam incident on hydrogen and deuterium targets is reported. Over 140 000 Drell-Yan muon pairs with dimuon mass Mmu+mu- greater than or equal to 4.5 GeV/c(2) were recorded. From these data, the ratio of antidown ((d) over bar) to antiup ((u) over bar) quark distributions in the proton sea is determined over a wide range in Bjorken x. A strong x dependence is observed in the ratio (d) over bar/(u) over bar, showing substantial enhancement of (d) over bar with respect to (u) over bar for x < 0.2. This result is in fair agreement with recent parton distribution parametrizations of the sea. For x > 0.2, the observed (d) over bar/(u) over bar ratio is much nearer unity than given by the parametrizations.

引用

页码：3715 / 3718

页数：4

共 24 条

[21] FLAVOR SYMMETRY BREAKING IN ANTI-QUARK DISTRIBUTIONS [J].