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

被引：100

作者：

Adolph, C. ^{[20
]}

Akhunzyanovh, R. ^{[19
]}

Alexeev, M. G. ^{[39
]}

Alexeev, G. D. ^{[19
]}

Amoroso, A. ^{[39
,40
]}

Andrieux, V. ^{[33
]}

Anosov, V. ^{[19
]}

Austregesilo, A. ^{[28
]}

Azevedo, C. ^{[13
]}

Badelek, B. ^{[43
]}

Balestra, F. ^{[39
,40
]}

Barth, J. ^{[16
]}

Baum, G. ^{[1
]}

Beck, R. ^{[15
]}

Bedfer, Y. ^{[22
,33
]}

Bernhard, J. ^{[22
,25
]}

Bicker, K. ^{[22
,28
]}

Bielert, E. R. ^{[22
]}

Birsa, R. ^{[37
]}

Bisplinghoff, J. ^{[15
]}

Bodlak, M. ^{[30
]}

Boer, M. ^{[33
]}

Bordalo, P. ^{[2
,24
]}

Bradamante, F. ^{[36
,37
]}

Braun, C. ^{[20
]}

Bressan, A. ^{[36
,37
]}

Buechele, M. ^{[21
]}

Burtin, E. ^{[33
]}

Capozza, L. ^{[3
,33
]}

Chang, W. -C. ^{[34
]}

Chiosso, M. ^{[39
,40
]}

Choi, I. ^{[41
]}

Chung, S. U. ^{[4
,5
,28
]}

Cicuttin, A. ^{[37
,38
]}

Crespo, M. L. ^{[37
,38
]}

Curiel, Q. ^{[33
]}

Dalla Torre, S. ^{[37
]}

Dasgupta, S. S. ^{[18
]}

Dasgupta, S. ^{[36
,37
]}

Denisov, O. Yu. ^{[40
]}

Dhara, L. ^{[18
]}

Donskov, S. V. ^{[32
]}

Doshita, N. ^{[45
]}

Duic, V. ^{[36
]}

Dziewiecki, M. ^{[44
]}

Efremov, A. ^{[19
]}

Eversheim, P. D. ^{[15
]}

Eyrich, W. ^{[20
]}

Ferrero, A. ^{[33
]}

Finger, M. ^{[30
]}

机构：

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

[2] Univ Lisbon, Inst Super Tecn, P-1699 Lisbon, Portugal

[3] Johannes Gutenberg Univ Mainz, Helmholtz Inst Strahlen & Kernphys, D-55099 Mainz, Germany

[4] Pusan Natl Univ, Dept Phys, Busan 609735, South Korea

[5] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[6] Chubu Univ, Kasugai, Aichi 4878501, Japan

[7] KEK, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan

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

[9] Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Region, Russia

[10] Rhein Westfal TH Aachen, Phys Inst 3, D-52056 Aachen, Germany

[11] Uppsala Univ, Box 516, SE-75120 Uppsala, Sweden

[12] Univ Piemonte Orientale, I-15100 Alessandria, Italy

[13] Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal

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

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

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

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

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

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

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

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

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

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

[24] LIP, P-1000149 Lisbon, Portugal

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

[26] Miyazaki Univ, Miyazaki 8892192, Japan

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

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

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

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

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

[32] Natl Res Ctr, Kurchatov Inst, State Sci Ctr Inst High Energy Phys, Protvino 142281, Russia

[33] CEA IRFU SPhN Saclay, F-91191 Gif Sur Yvette, France

[34] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

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

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

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

[38] Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy

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

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

[41] Univ Illinois, Dept Phys, 1110 W Green St, Urbana, IL 61801 USA

[42] Natl Ctr Nucl Res, PL-00681 Warsaw, Poland

[43] Univ Warsaw, Fac Phys, PL-02093 Warsaw, Poland

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

[45] Yamagata Univ, Yamagata 9928510, Japan

来源：

PHYSICS LETTERS B | 2016年 / 753卷

基金：

以色列科学基金会; 美国国家科学基金会;

关键词：

DEEP-INELASTIC-SCATTERING; DEPENDENT STRUCTURE-FUNCTION; PARTON DISTRIBUTIONS; POLARIZED LEPTONS; NUCLEON; Q(2)-DEPENDENCE; ASYMMETRIES; MODEL;

D O I：

10.1016/j.physletb.2015.11.064

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

New results for the double spin asymmetry A(1)(p) and the proton longitudinal spin structure function g(1)(p) are presented. They were obtained by the COMPASS Collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH3 target. The data were collected in 2011 and complement those recorded in 2007 at 160 GeV, in particular at lower values of x. They improve the statistical precision of g(1)(p)(x) by about a factor of two in the region x less than or similar to 0.02. A next-to-leading order QCD fit to the g(1) world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, Delta Sigma, ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of g(1)(p). The uncertainty of Delta Sigma is mostly due to the large uncertainty in the present determinations of the gluon helicity distribution. A new evaluation of the Bjorken sum rule based on the COMPASS results for the non-singlet structure function g(1)(NS) (x, Q(2)) yields as ratio of the axial and vector coupling constants vertical bar gA/gV vertical bar = 1.22 +/- 0.05 (stat.) +/- 0.10 (syst.), which validates the sum rule to an accuracy of about 9%. (C) 2015 The Authors. Published by Elsevier B.V.

引用

页码：18 / 28

页数：11

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