Longitudinal double-spin asymmetry A1p and spin-dependent structure function g1p of the proton at small values of x and Q2

被引：19

作者：

Aghasyan, M. ^{[24
]}

Alexeev, M. G. ^{[22
,25
]}

Alexeev, G. D. ^{[7
]}

Amoroso, A. ^{[22
,25
,26
]}

Andrieux, V. ^{[20
,28
]}

Anfimov, N. V. ^{[7
]}

Anosov, V. ^{[7
]}

Antoshkin, A. ^{[7
]}

Augsten, K. ^{[7
,18
]}

Augustyniak, W. ^{[29
]}

Austregesilo, A. ^{[15
]}

Azevedo, C. D. R. ^{[1
]}

Badelek, B. ^{[30
]}

Balestra, F. ^{[22
,25
,26
]}

Ball, M. ^{[3
]}

Barth, J. ^{[4
]}

Beck, R. ^{[3
]}

Bedfer, Y. ^{[20
]}

Bernhard, J. ^{[9
,12
]}

Bicker, K. ^{[9
,15
]}

Bielert, E. R. ^{[9
]}

Birsa, R. ^{[24
]}

Bodlak, M. ^{[17
]}

Bordalo, P. ^{[11
,12
]}

Bradamante, F. ^{[23
,24
]}

Bressan, A. ^{[23
,24
]}

Buechele, M. ^{[8
]}

Burtsev, V. E. ^{[27
]}

Capozza, L. ^{[20
]}

Chang, W. -C. ^{[21
]}

Chatterjee, C. ^{[6
]}

Chiosso, M. ^{[22
,25
,26
]}

Choi, I. ^{[28
]}

Chumakov, A. G. ^{[27
]}

Chung, S. -U. ^{[15
,34
,35
]}

Cicuttin, A. ^{[24
,36
]}

Crespo, M. L. ^{[24
,36
]}

Torre, S. Dalla ^{[24
]}

Dasgupta, S. S. ^{[6
]}

Dasgupta, S. ^{[23
,24
]}

Denisov, O. Yu. ^{[26
]}

Dhara, L. ^{[6
]}

Donskov, S. V. ^{[19
]}

Doshita, N. ^{[32
]}

Dreisbach, Ch. ^{[15
]}

Duennweber, W.

Dusaev, R. R. ^{[27
]}

Dziewiecki, M. ^{[31
]}

Efremov, A. ^{[7
]}

Eversheim, P. D. ^{[3
]}

机构：

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

[2] Univ Bochum, Inst Expt Phys, 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] Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India

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

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

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

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

[11] LIP, P-1000149 Lisbon, Portugal

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

[13] Univ Miyazaki, Miyazaki 8892192, Japan

[14] Lebedev Phys Inst, Moscow 119991, Russia

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

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

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

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

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

[20] Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France

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

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

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

[24] INFN, Trieste Sect, I-34127 Trieste, Italy

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

[26] INFN, Torino Sect, I-10125 Turin, Italy

[27] Tomsk Polytech Univ, Tomsk 634050, Russia

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

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

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

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

[32] Yamagata Univ, Yamagata 9928510, Japan

[33] Univ Lisbon, Inst Super Tecn, Lisbon, Portugal

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

[35] Brookhaven Natl Lab, Upton, NY 11973 USA

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

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

[38] Natl Cent Univ, Dept Phys, 300 Jhongda Rd, Jhongli 32001, Taiwan

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

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

[41] Yerevan Phys Inst, Alikhanian Br St, Yerevan 0036, Armenia

[42] Natl Kaohsiung Normal Univ, Dept Phys, Kaohsiung 824, Kaohsiung Count, Taiwan

[43] Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany

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

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

[46] Uppsala Univ, Box 516, S-75120 Uppsala, Sweden

来源：

PHYSICS LETTERS B | 2018年 / 781卷

关键词：

Inelastic muon scattering; Spin structure function; A(1); g(1); Low x; Low Q(2); SUM-RULE; MAGNETIC-MOMENT; LOW Q2; MODEL;

D O I：

10.1016/j.physletb.2018.03.044

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a precise measurement of the proton longitudinal double-spin asymmetry A(1)(p) and the proton spin-dependent structure function g(1)(P) at photon virtualities 0.006 (GeV/c)(2) < Q(2) < 1 (GeV/c)(2) in the Bjorken x range of 4 x 10(-5) < x < 4 x 10(-2). The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energies of 160 GeV and 200 GeV. The statistical precision is more than tenfold better than that of the previous measurement in this region. In the whole range of x, the measured values of A(1)(p) and g(1)(P) are found to be positive. It is for the first time that spin effects are found at such low values of x. (C) 2018 The Author(s). Published by Elsevier B.V.

引用

页码：464 / 472

页数：9

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