The deuteron spin-dependent structure function g1d and its first moment

被引:284
作者
Alexakhin, V. Yu.
Alexandrov, Yu.
Alexeev, G. D.
Alexeev, M.
Amoroso, A.
Badelek, B.
Balestra, F.
Ball, J.
Barth, J.
Baum, G.
Becker, M.
Bedfer, Y.
Bernet, C.
Bertini, R.
Bettinelli, M.
Birsa, R.
Bisplinghoff, J.
Bordalo, P.
Bradamante, F.
Bressan, A.
Brona, G.
Burtin, E.
Bussa, M. P.
Bytchkov, V. N.
Chapiro, A.
Cicuttin, A.
Colantoni, M.
Colavita, A. A.
Costa, S.
Crespo, M. L.
d'Hose, N.
Dalla Torre, S.
Das, S.
Dasgupta, S. S.
De Masi, R.
Dedek, N.
Demchenko, D.
Denisov, O. Yu.
Dhara, L.
Diaz, V.
Dinkelbach, A. M.
Donskov, S. V.
Dorofeev, V. A.
Doshita, N.
Duic, V.
Duennweber, W.
Efremov, A.
Eversheim, P. D.
Eyrich, W.
Faessler, M.
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 & Kernphys, D-53115 Bonn, Germany
[5] Univ Bonn, Inst Phys, D-53115 Bonn, Germany
[6] Acad Sci Czech Republic, Inst Sci Instruments, CS-61264 Brno, Czech Republic
[7] Univ Burdwan, Burdwan 713104, W Bengal, India
[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] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany
[13] Aalto Univ, Low Temp Lab, Helsinki 02015, Finland
[14] Univ Helsinki, Inst Phys, FIN-00014 Helsinki, Finland
[15] Tech Univ Liberec, Liberec 46117, Czech Republic
[16] LIP, P-1000149 Lisbon, Portugal
[17] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany
[18] Miyazaki Univ, Miyazaki 8892192, Japan
[19] PN Lebedev Phys Inst, Moscow 119991, Russia
[20] Univ Munich, Dept Phys, D-80799 Munich, Germany
[21] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
[22] Nagoya Univ, Nagoya, Aichi 464, Japan
[23] Charles Univ Prague, Fac Math & Phys, CR-18000 Prague, Czech Republic
[24] Czech Tech Univ, CR-16635 Prague, Czech Republic
[25] Inst High Energy Phys, State Res Ctr Russian Federat, Protvino 142281, Russia
[26] CEA Saclay, DAPNIA, SPhN, F-91191 Gif Sur Yvette, France
[27] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel
[28] Ist Nazl Fis Nucl, I-34014 Trieste, Italy
[29] ICTP INFN MLab Lab, I-34014 Trieste, Italy
[30] Ist Nazl Fis Nucl, I-34127 Trieste, Italy
[31] Univ Trieste, Dept Phys, I-34127 Trieste, Italy
[32] Ist Nazl Fis Nucl, I-10125 Turin, Italy
[33] Univ Turin, Dept Phys, I-10125 Turin, Italy
[34] Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland
[35] Warsaw Univ, PL-00681 Warsaw, Poland
[36] Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland
[37] Univ Tecn Lisboa, Inst Super Tecn, P-1096 Lisbon, Portugal
[38] Univ E Piedmont, I-15100 Alessandria, Italy
[39] Chubu Univ, Kasugai, Aichi 4878501, Japan
[40] Yamagata Univ, Yonezawa, Yamagata 9928510, Japan
关键词
deep inelastic scattering; spin; structure function; QCD analysis; A(1); g(1);
D O I
10.1016/j.physletb.2006.12.076
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a measurement of the deuteron spin-dependent structure function g(1)(d) based on the data collected by the COMPASS experiment at CERN during the years 2002-2004. The data provide an accurate evaluation for Gamma(d)(1), the first moment of g(1)(d) (x), and for the matrix element of the singlet axial current, a(0). The results of QCD fits in the next to leading order (NLO) on all g(1) deep inelastic scattering data are also presented. They provide two solutions with the gluon spin distribution function Delta G positive or negative, which describe the data equally well. In both cases, at Q(2) = 3 (GeV/c)(2) the first moment of Delta G(x) is found to be of the order of 0.2-0.3 in absolute value. (c) 2007 Elsevier B.V. All rights reserved.
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收藏
页码:8 / 17
页数:10
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