Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering

被引：139

作者：

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

Alexakhin, V. Yu. ^{[8
]}

Alexandrov, Yu. ^{[15
]}

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

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

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

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

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

Barth, J. ^{[5
]}

Baum, G. ^{[2
]}

Bedfer, Y. ^{[22
]}

Bernhard, J. ^{[13
]}

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

Bettinelli, M. ^{[16
]}

Birsa, R. ^{[24
]}

Bisplinghoff, J. ^{[4
]}

Bordalo, P. ^{[12
,34
]}

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

Bravar, A. ^{[24
]}

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

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

Burtin, E. ^{[22
]}

Bussa, M. P. ^{[27
,28
]}

Chaberny, D. ^{[13
]}

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

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

Cicuttin, A. ^{[24
,26
]}

Colantoni, M. ^{[27
]}

Crespo, M. L. ^{[24
,26
]}

Dalla Torre, S. ^{[24
]}

Das, S. ^{[7
]}

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

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

Dhara, L. ^{[7
]}

Diaz, V. ^{[24
,26
]}

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. ^{[22
]}

Filin, A. ^{[21
]}

Finger, M. ^{[19
]}

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

Fischer, H. ^{[10
]}

Franco, C. ^{[12
]}

机构：

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

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

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

[4] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, 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] 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] Abdus Salam Int Ctr Theoret Phys, I-34127 Trieste, Italy

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

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

[29] Univ Piemonte Orientale, I-10125 Turin, 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, P-1100 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 / 693卷 / 03期

关键词：

COMPASS; Semi-inclusive deep inelastic scattering; Spin; Structure function; Parton distribution functions; DEPENDENT STRUCTURE-FUNCTION; DEEP-INELASTIC SCATTERING; FLAVOR ASYMMETRY; NUCLEON; SEA; SUM;

D O I：

10.1016/j.physletb.2010.08.034

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Double-spin asymmetries for production of charged pions and kaons in semi-inclusive deep-inelastic muon scattering have been measured by the COMPASS experiment at CERN. The data, obtained by scattering a 160 GeV muon beam off a longitudinally polarised NH3 target, cover a range of the Bjorken variable x between 0.004 and 0.7. A leading order evaluation of the helicity distributions for the three lightest quarks and antiquark flavours derived from these asymmetries and from our previous deuteron data is presented. The resulting values of the sea quark distributions are small and do not show any sizable dependence on x in the range of the measurements. No significant difference is observed between the strange and antistrange helicity distributions, both compatible with zero. The integrated value of the flavour asymmetry of the helicity distribution of the light-quark sea, Delta(u) over bar - Delta(d) over bar, is found to be slightly positive, about 1.5 standard deviations away from zero. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：227 / 235

页数：9

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