II - Experimental investigation of transverse spin asymmetries in μ-p SIDIS processes: Sivers asymmetries

被引：113

作者：

Adolph, C. ^{[10
]}

Alekseev, M. G. ^{[2
]}

Alexakhin, V. Yu. ^{[9
]}

Alexandrov, Yu. ^{[17
]}

Alexeev, G. D. ^{[9
]}

Amoroso, A. ^{[27
,28
]}

Antonov, A. A. ^{[9
]}

Austregesilo, A. ^{[12
,19
]}

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

Balestra, F. ^{[27
,28
]}

Barth, J. ^{[6
]}

Baum, G. ^{[3
]}

Bedfer, Y.

Bernhard, J. ^{[15
]}

Bertini, R. ^{[27
,28
]}

Bettinelli, M. ^{[18
]}

Bicker, K. ^{[12
,19
]}

Bieling, J. ^{[6
]}

Birsa, R. ^{[2
]}

Bisplinghoff, J. ^{[5
]}

Bordalo, P. ^{[14
,34
]}

Bradamante, F. ^{[1
,2
]}

Braun, C. ^{[10
]}

Bravar, A. ^{[2
]}

Bressan, A. ^{[1
,2
]}

Buechele, M. ^{[11
]}

Burtin, E.

Capozza, L.

Chiosso, M. ^{[27
,28
]}

Chung, S. U. ^{[19
]}

Cicuttin, A. ^{[2
,26
]}

Crespo, M. L. ^{[2
,26
]}

Dalla Torre, S. ^{[2
]}

Das, S. ^{[8
]}

Dasgupta, S. S. ^{[8
]}

Dasgupta, S. ^{[8
]}

Denisov, O. Yu. ^{[28
]}

Dhara, L. ^{[8
]}

Donskov, S. V. ^{[23
,24
]}

Doshita, N. ^{[33
]}

Duic, V. ^{[1
,2
]}

Duennweber, W. ^{[18
]}

Dziewiecki, M. ^{[32
]}

Efremov, A. ^{[9
]}

Elia, C. ^{[1
,2
]}

Eversheim, P. D. ^{[5
]}

Eyrich, W. ^{[10
]}

Faessler, M. ^{[18
]}

Ferrero, A.

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

机构：

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

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

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

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

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

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

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

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

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

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

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

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

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

[14] LIP, P-1000149 Lisbon, Portugal

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

[16] Miyazaki Univ, Miyazaki 8892192, Japan

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[31] Natl Ctr Nucl Res, 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, P-1100 Lisbon, Portugal

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

[36] KEK, Tsukuba, Ibaraki 3050801, Japan

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

来源：

PHYSICS LETTERS B | 2012年 / 717卷 / 4-5期

基金：

以色列科学基金会;

关键词：

DEEP-INELASTIC SCATTERING; COLLINS; DISTRIBUTIONS;

D O I：

10.1016/j.physletb.2012.09.056

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV mu(+) beam and a transversely polarised NH3 target. The Sivers asymmetry of the proton has been extracted in the Bjorken x range 0.003 < x < 0.7. The new measurements have small statistical and systematic uncertainties of a few percent and confirm with considerably better accuracy the previous COMPASS measurement. The Sivers asymmetry is found to be compatible with zero for negative hadrons and positive for positive hadrons, a clear indication of a spin-orbit coupling of quarks in a transversely polarised proton. As compared to measurements at lower energy, a smaller Sivers asymmetry for positive hadrons is found in the region x > 0.03. The asymmetry is different from zero and positive also in the low x region, where sea-quarks dominate. The kinematic dependence of the asymmetry has also been investigated and results are given for various intervals of hadron and virtual photon fractional energy. In contrast to the case of the Collins asymmetry, the results on the Sivers asymmetry suggest a strong dependence on the four-momentum transfer to the nucleon, in agreement with the most recent calculations. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：383 / 389

页数：7

共 36 条

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