Flavor decomposition of the polarized quark distributions in the nucleon from inclusive and semi-inclusive deep-inelastic scattering

被引：222

作者：

Ackerstaff, K ^{[1
]}

Airapetian, A

Akopov, N

Akushevich, I

Amarian, M

Aschenauer, EC

Avakian, H

Avakian, R

Avetissian, A

Bains, B

Barrow, S

Baumgarten, C

Beckmann, M

Belostotski, S

Belz, JE

Benisch, T

Bernreuther, S

Bianchi, N

Blanchard, S

Blouw, J

Böttcher, H

Borissov, A

Brack, J

Bray, B

Brauksiepe, S

Braun, B

Brons, S

Brückner, W

Brüll, A

Bruins, EEW

Bulten, HJ

Cadman, RV

Capitani, GP

Carter, P

Chumney, P

Cisbani, E

Court, GR

Dalpiaz, PF

De Leo, R

Delheij, PPJ

De Sanctis, E

De Schepper, D

Devitsin, E

Huberts, PKAD

Di Nezza, P

Düren, M

Dvoredsky, A

Ely, J

Elbakian, G

Emerson, J

机构：

[1] DESY, D-22603 Hamburg, Germany

[2] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada

[3] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

[4] Ist Nazl Fis Nucl, Sezi Bari, I-70124 Bari, Italy

[5] CALTECH, WK Kellogg Radiat Lab, Pasadena, CA 91125 USA

[6] Univ Colorado, Nucl Phys Lab, Boulder, CO 80309 USA

[7] DESY, D-15738 Zeuthen, Germany

[8] Joint Inst Nucl Res, Dubna 141980, Russia

[9] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany

[10] Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy

[11] Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy

[12] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[13] Florida Int Univ, Dept Phys, Miami, FL 33199 USA

[14] Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany

[15] State Univ Ghent, Dept Subatom & Radiat Phys, B-9000 Ghent, Belgium

[16] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany

[17] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[18] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA

[19] Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England

[20] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[21] Univ Marburg, Inst Phys, D-35037 Marburg, Germany

[22] MIT, Nucl Sci Lab, Cambridge, MA 02139 USA

[23] Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA

[24] PN Lebedev Phys Inst, Moscow 117924, Russia

[25] Univ Munich, Sekt Phys, D-85748 Garching, Germany

[26] New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA

[27] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[28] Oregon State Univ, Dept Phys, Corvallis, OR 97331 USA

[29] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[30] Petersburg Nucl Phys Inst, St Petersburg 188350, Russia

[31] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany

[32] Ist Nazl Fis Nucl, Sez Sanita, I-00161 Rome, Italy

[33] Ist Super Sanita, Phys Lab, I-00161 Rome, Italy

[34] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada

[35] TRIUMF, Vancouver, BC V6T 2A3, Canada

[36] Tokyo Inst Technol, Dept Phys, Tokyo 152, Japan

[37] Free Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands

[38] Yerevan Phys Inst, Yerevan 375036, Armenia

来源：

PHYSICS LETTERS B | 1999年 / 464卷 / 1-2期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会; 日本学术振兴会;

关键词：

D O I：

10.1016/S0370-2693(99)00964-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Spin asymmetries of semi-inclusive cross sections for the production of positively and negatively charged hadrons have been measured in deep-inelastic scattering of polarized positrons on polarized hydrogen and He-3 targets, in the kinematic range 0.023 < x < 0.6 and 1 GeV2 < Q(2) < 10 GeV2. Polarized quark distributions are extracted as a function of x for up (u + (u) over bar) and down (d + (d) over bar) flavors. The up quark polarization is positive and the down quark polarization is negative in the measured range. The polarization of the sea is compatible with zero. The first moments of the polarized quark distributions are presented. The isospin non-singlet combination dq, is consistent with the prediction based on the Bjorken sum rule. The moments of the polarized quark distributions are compared to predictions based on SU(3)(f) flavor symmetry and to a prediction from lattice QCD. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：123 / 134

页数：12

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