Spin asymmetries for events with high pT hadrons in DIS and an evaluation of the gluon polarization -: art. no. 012002

被引：139

作者：

Adeva, B ^{[1
]}

Arik, E

Arvidson, A

Badelek, B

Baum, G

Berglund, P

Betev, L

Birsa, R

de Botton, N

Bradamante, F

Bravar, A

Bressan, A

Bültmann, S

Burtin, E

Crabb, D

Cranshaw, J

Çuhadar, T

Dalla Torre, S

van Dantzig, R

Derro, B

Deshpande, A

Dhawan, S

Dulya, C

Eichblatt, S

Fasching, D

Feinstein, F

Fernandez, C

Frois, B

Gallas, A

Garzon, JA

Gilly, H

Giorgi, M

von Goeler, E

Goertz, S

Gracia, G

de Groot, N

Perdekamp, MG

Haft, K

von Harrach, D

Hasegawa, T

Hautle, P

Hayashi, N

Heusch, CA

Horikawa, N

Hughes, VW

Igo, G

Ishimoto, S

Iwata, T

Kabuss, EM

Karev, A

机构：

[1] Univ Santiago, Dept Particle Phys, Santiago De Compostela 15706, Spain

[2] Univ Bielefeld, Dept Phys, D-33501 Bielefeld, Germany

[3] Bogazici Univ, Istanbul, Turkey

[4] Istanbul Tech Univ, TR-80626 Istanbul, Turkey

[5] Ruhr Univ Bochum, Dept Phys, D-44780 Bochum, Germany

[6] Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90024 USA

[7] CERN, CH-1211 Geneva 23, Switzerland

[8] Univ Freiburg, Dept Phys, D-79104 Freiburg, Germany

[9] GKSS, D-21494 Geesthacht, Germany

[10] Aalto Univ, Low Temp Lab, FIN-02150 Espoo, Finland

[11] Inst Particle Phys Technol, Espoo, Finland

[12] Univ Houston, Dept Phys, Houston, TX 77204 USA

[13] Univ Houston, Inst Beam Particle Dynam, Houston, TX 77204 USA

[14] JINR Dubna, RU-141980 Dubna, Russia

[15] Johannes Gutenberg Univ Mainz, Inst Phys Nucl, D-55099 Mainz, Germany

[16] Univ Mons, Fac Sci, B-7000 Mons, Belgium

[17] Univ Munich, Dept Phys, D-80799 Munich, Germany

[18] Nagoya Univ, Dept Phys, Chikusa Ku, Nagoya, Aichi 464, Japan

[19] CIRSE, Chikusa Ku, Nagoya, Aichi 464, Japan

[20] Free Univ Amsterdam, NL-1009 AJ Amsterdam, Netherlands

[21] Delft Univ Technol, FOM, NIKHEF, NL-1009 AJ Amsterdam, Netherlands

[22] Northeastern Univ, Dept Phys, Boston, MA 02115 USA

[23] Northwestern Univ, Dept Phys, Evanston, IL 60208 USA

[24] Rice Univ, Bonner Lab, Houston, TX 77251 USA

[25] CEA Saclay, DAPNIA, F-91191 Gif Sur Yvette, France

[26] Univ Santiago, Dept Particle Phys, Santiago De Compostela 15706, Spain

[27] Tel Aviv Univ, Sch Phys, IL-69978 Tel Aviv, Israel

[28] Univ Trieste, I-34127 Trieste, Italy

[29] INFN Trieste, Dept Phys, I-34127 Trieste, Italy

[30] Uppsala Univ, Dept Radiat Sci, S-75121 Uppsala, Sweden

[31] Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA

[32] Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland

[33] Warsaw Univ, PL-00681 Warsaw, Poland

[34] Yale Univ, Dept Phys, New Haven, CT 06511 USA

[35] Miyazaki Univ, Fac Engn, Miyazaki 88921, Japan

[36] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[37] RIKEN, Inst Phys & Chem Res, Wako, Saitama 35101, Japan

[38] Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA

[39] KEK, Tsukuba, Ibaraki 305, Japan

[40] Univ Buenos Aires, Dept Phys, RA-1428 Buenos Aires, DF, Argentina

[41] Warsaw Univ Technol, PL-00665 Warsaw, Poland

来源：

PHYSICAL REVIEW D | 2004年 / 70卷 / 01期

关键词：

D O I：

10.1103/PhysRevD.70.012002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a measurement of the longitudinal spin cross section asymmetry for deep-inelastic muon-nucleon interactions with two high transverse momentum hadrons in the final state. Two methods of event classification are used to increase the contribution of the photon-gluon fusion process to above 30%. The most effective one, based on a neural network approach, provides the asymmetries A(p)lN(-->)lhhX=0.030+/-0.057(stat)+/-0.010(syst) and A(d)lN(-->)lhhX=0.070+/-0.076(stat)+/-0.010(syst). From these values we derive an averaged gluon polarization DeltaG/G=-0.20+/-0.28(stat)+/-0.10(syst) at an average fraction of nucleon momentum carried by gluons <eta>=0.07.

引用

页码：012002 / 1

页数：9

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