The spin-dependent structure function of the proton g1p and a test of the Bjorken sum rule

被引：159

作者：

Alekseev, M. G. ^{[27
]}

Alexakhin, V. Yu ^{[8
]}

Alexandrov, Yu ^{[15
]}

Alexeev, G. D. ^{[8
]}

Amoroso, A. ^{[26
,27
]}

Austregesilo, A. ^{[1
,17
]}

Badelek, B. ^{[30
,31
]}

Balestra, F. ^{[26
,27
]}

Ball, J. ^{[22
]}

Barth, J. ^{[5
]}

Baum, G. ^{[2
]}

Bedfer, Y. ^{[22
]}

Bernhard, J. ^{[13
]}

Bertini, R. ^{[26
,27
]}

Bettinelli, M. ^{[16
]}

Birsa, R. ^{[24
]}

Bisplinghoff, J. ^{[4
]}

Bordalo, P. ^{[12
]}

Bradamante, F. ^{[24
,25
]}

Bravar, A. ^{[24
]}

Bressan, A. ^{[24
,25
]}

Brona, G. ^{[1
,30
,31
]}

Burtin, E. ^{[22
]}

Bussa, M. P. ^{[26
,27
]}

Chaberny, D. ^{[13
]}

Cotic, D. ^{[13
]}

Chiosso, M. ^{[26
,27
]}

Chung, S. U. ^{[17
]}

Cicuttin, A. ^{[24
,28
]}

Colantoni, M. ^{[27
]}

Crespo, M. L. ^{[24
,28
]}

Dalla Torre, S. ^{[24
]}

Das, S. ^{[7
]}

Dasgupta, S. S. ^{[7
]}

Denisov, O. Yu ^{[1
,27
]}

Dhara, L. ^{[7
]}

Diaz, V. ^{[24
,28
]}

Donskov, S. V. ^{[21
]}

Doshita, N. ^{[3
,33
]}

Duic, V. ^{[24
,25
]}

Duennweber, W. ^{[16
]}

Efremov, A. ^{[8
]}

El Alaoui, A. ^{[22
]}

Eversheim, P. D. ^{[4
]}

Eyrich, W. ^{[9
]}

Faessler, M. ^{[16
]}

Ferrero, A. ^{[1
,26
,27
]}

Filin, A. ^{[21
]}

Finger, M. ^{[19
]}

Finger, M., Jr. ^{[8
]}

机构：

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

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

[3] Ruhr Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany

[4] Univ Bonn, Helmholtz Inst Strahlen & Kern Phys, D-53115 Bonn, Germany

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

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

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

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

[9] Univ Erlangen Nurnberg, Inst Phys, D-91054 Erlangen, Germany

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

[11] Tech Univ Liberec, Liberec 46117, Czech Republic

[12] LIP, P-1000149 Lisbon, Portugal

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

[14] Miyazaki Univ, Miyazaki 8892192, Japan

[15] PN Lebedev Phys Inst, Moscow 119991, Russia

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

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

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

[19] Charles Univ Prague, Fac Math & Phys, CR-18000 Prague, Czech Republic

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

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

[22] CEA, Irfu SPhN Saclay, F-91191 Gif Sur Yvette, France

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

[24] Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy

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

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

[27] Ist Nazl Fis Nucl, Torino Sect, I-10125 Turin, Italy

[28] Abdus Salam Int Ctr Theoret Phys, I-34127 Trieste, Italy

[29] Univ Piemonte Orientale, I-1500 Alessandria, Italy

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

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

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

[33] Yamagata Univ, Yamagata 9928510, Japan

[34] Univ Tecn Lisboa, IST, Lisbon, Portugal

[35] Chubu Univ, Aichi 4878501, Japan

[36] KEK, Tsukuba, Ibaraki 3050801, Japan

[37] GSI mbH, D-64291 Darmstadt, Germany

来源：

PHYSICS LETTERS B | 2010年 / 690卷 / 05期

基金：

以色列科学基金会;

关键词：

COMPASS; Deep inelastic scattering; Spin; Structure function; QCD analysis; Bjorken sum rule; DEEP-INELASTIC-SCATTERING; ASYMMETRY; DEUTERON; TARGET;

D O I：

10.1016/j.physletb.2010.05.069

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The inclusive double-spin asymmetry. A(1)(p), has been measured at COMPASS in deep-inelastic polarised muon scattering off a large polarised NH3 target. The data, collected in the year 2007, cover the range Q(2) > 1 (GeV/c)(2), 0.004 < x < 0.7 and improve the statistical precision of g(1)(p)(x) by a factor of two in the region x < 0.02. The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g(1)(NS)(x. Q(2)). The isovector quark density, Delta q(3)(x, Q(2)), is evaluated from a NLO QCD fit of g(1)(NS). The first moment of Delta q(3) is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants vertical bar g(A)/g(V)vertical bar = 1.28 +/- 0.07 (stat.) +/- 0.10 (syst.). (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：466 / 472

页数：7

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