Precision measurement of the proton and deuteron spin structure functions g2 and asymmetries A2

被引:188
作者
Anthony, PL [8 ]
Arnold, RG
Averett, T
Band, HR
Benmouna, N
Boeglin, W
Borel, H
Bosted, PE
Bültmann, SL
Court, GR
Crabb, D
Day, D
Decowski, P
DePietro, P
Egiyan, H
Erbacher, R
Erickson, R
Fatemi, R
Frlez, E
Griffioen, KA
Harris, C
Hughes, EW
Hyde-Wright, C
Igo, G
Johnson, J
King, P
Kramer, K
Kuhn, SE
Lawrence, D
Liang, Y
Lindgren, R
Lombard-Nielsen, RM
McKee, P
McNulty, DE
Meyer, W
Mitchell, GS
Mitchell, J
Olson, M
Penttila, S
Peterson, GA
Pitthan, R
Pocanic, D
Prepost, R
Prescott, C
Raue, BA
Reyna, D
Ryan, P
Rochester, LS
Rock, S
Rondon-Aramayo, O
机构
[1] American Univ, Washington, DC 20016 USA
[2] CALTECH, Pasadena, CA 91125 USA
[3] Univ Calif Los Angeles, Los Angeles, CA 90095 USA
[4] CEA Saclay, DAPNIA Serv Phys Nucl, F-91191 Gif Sur Yvette, France
[5] Florida Int Univ, Miami, FL 33199 USA
[6] Univ Liverpool, Liverpool L69 3BX, Merseyside, England
[7] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[8] Univ Massachusetts, Amherst, MA 01003 USA
[9] Old Dominion Univ, Norfolk, VA 23529 USA
[10] St Norbert Coll, De Pere, WI 54115 USA
[11] Smith Coll, Northampton, MA 01063 USA
[12] Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA
[13] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA
[14] Univ Virginia, Charlottesville, VA 22901 USA
[15] Coll William & Mary, Williamsburg, VA 23187 USA
[16] Univ Wisconsin, Madison, WI 53706 USA
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0370-2693(02)03015-0
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have measured the spin struction functions g(2)(p) and g(2)(d) and the virtual photon asymmetries A(2)(p) and A(2)(d) over the kinetmatic range 0.02 less than or equal to x less than or equal to 0.8 and 0.7 less than or equal to Q(2) less than or equal to 20 GeV2 by scattering 29.1 and 32.3 GeV longitudinally polarized electrons from transversely polarized NH3 and (LiD)-Li-6 targets. Our measured g(2) approximately follows the twist-2 Wandzura-Wilczek calculation. The twist-3 reduced matrix elements d(2)(p) and d(2)(n) are less than two standard deviations from zero. The data are inconsistent with the Burkhardt-Cottingham sum rule if there is no pathological behavior as x --> 0. The Efremov-Leader-Teryaev integral is consistent with zero within our measured kinematic range. The absolute value of A(2) is significantly smaller than the A(2) < rootR(1 + A(1))/2- limit. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:18 / 24
页数:7
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