Precision Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetries A2
Precision Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetries A2
复制标题
质子和氘核自旋结构函数 g2 和不对称性 A2 的精确测量
DOI：
10.1016/s0370-2693(02)03015-0
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发表时间：
2002
影响因子：
4.4
通讯作者：
E. al.
中科院分区：
文献类型：
--
作者：
S. E. C. P. Anthony;R. Arnold;T. Averett;E. al.
We have measured the spin structure functions g2pand g2dand the virtual photon asymmetries A2pand A2dover the kinematic range 0.02⩽x⩽0.8 and 0.7⩽Q2⩽20 GeV2by scattering 29.1 and 32.3 GeV longitudinally polarized electrons from transversely polarized NH3and6LiD targets. Our measured g2approximately follows the twist-2 Wandzura–Wilczek calculation. The twist-3 reduced matrix elements d2pand d2nare 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 A2is significantly smaller than the A2< R(1+A1)/2 limit.
