Gluon polarization in the nucleon from quasi-real photoproduction of high-PT hadron pair

被引：162

作者：

Ageev, ES

Alexakhin, VY

Alexandrov, Y

Alexeev, GD

Amoroso, A

Badelek, B

Balestra, F

Ball, J

Baum, G

Bedfer, Y

Berglund, P

Bernet, C

Bertini, R

Birsa, R

Bisplinghoff, J

Bordalo, P

Bradamante, F

Bravar, A

Bressan, A

Brona, G

Burtin, E

Bussa, MP

Bytchkov, VN

Cerini, L

Chapiro, A

Cicuttin, A

Colantoni, M

Colavita, AA

Costa, S

Crespo, ML

Dalla Torre, S

Dasgupta, SS

Dedek, N

De Masi, R

Denisov, OY

Dhara, L

Diaz, V

Dinkelbach, AM

Dolgopolov, AV

Donskov, SV

Dorofeev, VA

Doshita, N

Duic, V

Dünnweber, W

Ehlers, J

Eversheim, PD

Eyrich, W

Fabro, M

Faessler, M

Falaleev, V

机构：

[1] Univ Bielefeld, Fak Phys, D-33501 Bielefeld, Germany

[2] Ruhr Univ Bochum, Inst Experimentalphys, D-44780 Bochum, Germany

[3] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[4] Univ Bonn, Phys Inst, D-53115 Bonn, Germany

[5] AS CR, Inst Sci Instruments, Brno 61264, Czech Republic

[6] Univ Burdwan, Burdwan 713104, W Bengal, India

[7] Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India

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

[9] Univ Erlangen Nurnberg, Phys Inst, D-910543 Erlangen, Germany

[10] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany

[11] Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany

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

[13] Heidelberg Univ, Phys Inst, D-69120 Heidelberg, Germany

[14] Aalto Univ, Low Temp Lab, Espoo 02015, Finland

[15] Univ Helsinki, Helsinki Inst Phys, Helsinki 00014, Finland

[16] Tech Univ Liberec, Libechov 46117, Czech Republic

[17] LIP, P-1000149 Lisbon, Portugal

[18] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[19] Miyazaki Univ, Miyazaki 8892191, Japan

[20] Lebedev Phys Inst, Moscow 119991, Russia

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

[22] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany

[23] Nagoya Univ, Nagoya, Aichi 464, Japan

[24] Charles Univ Prague, Fac Math & Phys, Prague 18000, Czech Republic

[25] Czech Tech Univ, Prague 16636, Czech Republic

[26] State Res Ctr Russian Federat, Inst High Energy Phys, Protvino 142281, Russia

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

[28] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[29] ICTP INFM MLab Lab, I-34014 Trieste, Italy

[30] Univ Trieste, INFN Trieste, I-34127 Trieste, Italy

[31] Univ Trieste, Dept Phys, I-34127 Trieste, Italy

[32] Univ Turin, INFN Turin, I-10125 Turin, Italy

[33] Univ Turin, Dept Phys, I-10125 Turin, Italy

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

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

[36] Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland

来源：

PHYSICS LETTERS B | 2006年 / 633卷 / 01期

关键词：

nucleon; spin; gluon; polarization; asymmetry; deep inelastic scattering;

D O I：

10.1016/j.physletb.2005.11.049

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a determination of the gluon polarization Delta G/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q(2) < 1 (GeV/c)(2), with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered on a polarized (LiD)-Li-6 target. The helicity asymmetry for the selected events is (A(parallel to)/D) = 0.002 +/- 0.019(stat) +/- 0.003(syst). From this value, we obtain in a leading-order QCD analysis Delta G/G = 0.024 +/- 0.089(stat) +/- 0.057(syst) at x(g) = 0.095 and mu(2) similar or equal to 3 (GeV/c)(2). (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：25 / 32

页数：8

共 27 条

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