Polarisation of valence and non-strange sea quarks in the nucleon from semi-inclusive spin asymmetries

被引：124

作者：

Adeva, B

Arik, E

Arvidson, A

Badelek, B

Ballintijn, MK

Bardin, G

Baum, G

Berglund, P

Betev, L

Bird, IG

Birsa, R

Bjorkholm, P

Bonner, BE

deBotton, N

Bradamante, F

Bressan, A

Bultmann, S

Burtin, E

Cavata, C

Crabb, D

Cranshaw, J

Cuhadar, T

DallaTorre, S

vanDantzig, R

Deshpande, A

Dhawan, S

Dulya, C

Dyring, A

Eichblatt, S

Faivre, JC

Fasching, D

Feinstein, F

Fernandez, C

Frois, B

Garzon, JA

Gaussiran, T

Giorgi, M

vonGoeler, E

Gomez, A

Gracia, G

deGroot, N

Perdekamp, MG

Gulmez, E

vonHarrach, D

Hasegawa, T

Hautle, P

Hayashi, N

Heusch, CA

Horikawa, N

Hughes, VW

机构：

[1] UNIV BIELEFELD,DEPT PHYS,D-33501 BIELEFELD,GERMANY

[2] BOGAZICI UNIV,ISTANBUL,TURKEY

[3] ISTANBUL TECH UNIV,CEKMECE NUCL RES CTR,ISTANBUL 80626,TURKEY

[4] UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024

[5] CERN,CH-1211 GENEVA 23,SWITZERLAND

[6] UNIV FREIBURG,DEPT PHYS,D-79104 FREIBURG,GERMANY

[7] GKSS FORSCHUNGSZENTRUM GEESTHACHT GMBH,D-21494 GEESTHACHT,GERMANY

[8] HELSINKI UNIV TECHNOL,LOW TEMP LAB,OTAKAARI 3A,SF-02150 ESPOO,FINLAND

[9] HELSINKI UNIV TECHNOL,INST PARTICLE PHYS TECHNOL,SF-02150 ESPOO,FINLAND

[10] UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204

[11] INST BEAM PARTICLE DYNAM,HOUSTON,TX 77204

[12] JOINT INST NUCL RES DUBNA,LAB PARTICLE PHYS,DUBNA,RUSSIA

[13] UNIV MAINZ,INST PHYS NUCL,D-55099 MAINZ,GERMANY

[14] UNIV MONS,FAC SCI,B-7000 MONS,BELGIUM

[15] UNIV MUNICH,DEPT PHYS,D-80799 MUNICH,GERMANY

[16] NAGOYA UNIV,DEPT PHYS,CHIKUSA KU,FURO CHO,NAGOYA,AICHI 464,JAPAN

[17] DELFT UNIV TECHNOL,NIKHEF H,FOM,1009 AJ AMSTERDAM,NETHERLANDS

[18] FREE UNIV AMSTERDAM,1009 AJ AMSTERDAM,NETHERLANDS

[19] NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115

[20] NORTHWESTERN UNIV,DEPT PHYS,EVANSTON,IL 60208

[21] RICE UNIV,BONNER LAB,HOUSTON,TX 77251

[22] CENS,DPNIA,F-91191 GIF SUR YVETTE,FRANCE

[23] TEL AVIV UNIV,SCH MED,IL-69978 TEL AVIV,ISRAEL

[24] IST NAZL FIS NUCL,I-34127 TRIESTE,ITALY

[25] UNIV TRIESTE,DEPT PHYS,I-34127 TRIESTE,ITALY

[26] UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN

[27] UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901

[28] SOLTAN INST NUCL STUDIES,PL-00681 WARSAW,POLAND

[29] UNIV WARSAW,PL-00681 WARSAW,POLAND

[30] YALE UNIV,DEPT PHYS,NEW HAVEN,CT 06511

[31] UNIV CALIF SANTA CRUZ,INST PARTICLE PHYS,SANTA CRUZ,CA 95064

来源：

PHYSICS LETTERS B | 1996年 / 369卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0370-2693(95)01584-1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering of polarised muons on polarised protons and deuterons in the range 0.003 < x < 0.7. From these asymmetries and the previously published inclusive spin asymmetries we determine, for the first time, the x-dependent spin distributions for up and down valence quarks and for non-strange sea quarks. We find that the first moments of the valence quark spin distributions are Delta u(v) = 1.01 +/- 0.19 +/- 0.14 and Delta d(v) = -0.57 +/- 0.22 +/- 0.11. The spin distribution function of non-strange sea quarks is consistent with zero over the measured range of x and the first moment is Delta (u) over bar = Delta (d) over bar = -0.02 +/- 0.09 +/- 0.03.

引用

页码：93 / 100

页数：8

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