Flavor decomposition of the sea-quark helicity distributions in the nucleon from semiinclusive deep inelastic scattering -: art. no. 012005

被引：128

作者：

Airapetian, A ^{[1
]}

Akopov, N

Akopov, Z

Amarian, M

Ammosov, VV

Andrus, A

Aschenauer, EC

Augustyniak, W

Avakian, R

Avetissian, A

Avetissian, E

Bailey, P

Baturin, V

Baumgarten, C

Beckmann, M

Belostotski, S

Bernreuther, S

Bianchi, N

Blok, HP

Böttcher, H

Borissov, A

Bouwhuis, M

Brack, J

Brüll, A

Bryzgalov, V

Capitani, GP

Chiang, HC

Ciullo, G

Contalbrigo, M

Dalpiaz, PF

De Leo, R

De Nardo, L

De Sanctis, E

Devitsin, E

Di Nezza, P

Düren, M

Ehrenfried, M

Elalaoui-Moulay, A

Elbakian, G

Ellinghaus, F

Elschenbroich, U

Ely, J

Fabbri, R

Fantoni, A

Fechtchenko, A

Felawka, L

Fox, B

Franz, J

Frullani, S

Gärber, Y

机构：

[1] Yerevan Phys Inst, Yerevan 375036, Armenia

[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, Sez Bari, I-70124 Bari, Italy

[5] Univ Colorado, Ist Nazl Fis Nucl, Boulder, CO 80309 USA

[6] DESY, Deutsch Elekt Synchrotron, D-22603 Hamburg, Germany

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

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

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

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

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

[15] Univ Giessen, Inst Phys, D-35392 Giessen, Germany

[16] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

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

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

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

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

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

[22] Natl Inst Nucl Phys & High Energy Phys, NL-1009 DB Amsterdam, Netherlands

[23] Petersburg Nucl Phys Inst, Gatchina 188350, Russia

[24] Inst High Energy Phys, Protvino 142281, Moscow Region, Russia

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

[26] Ist Super Sanita, Ist Nazl Fis Nucl, Sez Roma 1, Grp Sanita & Phys Lab, I-00161 Rome, Italy

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

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

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

[30] Vrije Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands

[31] Andrzej Soltan Inst Nucl Studies, PL-00689 Warsaw, Poland

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.92.012005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Double-spin asymmetries of semiinclusive cross sections for the production of identified pions and kaons have been measured in deep inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with reanalyzed previous data for identified pions from a hydrogen target. These distributions are consistent with zero for all three sea flavors. A recently predicted flavor asymmetry in the polarization of the light quark sea appears to be disfavored by the data.

引用

页数：5

共 32 条

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