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

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Authors
E155 Collaboration
Abe, K.
Akagi, T.
Anthony, P L.
Antonov, R D.
Arnold, R G.
Averett, T.
Band, H R.
Bauer, J M.
Borel, H.
Subjects
Advisors
Date of Issue
2003
Date
Publisher
Elsevier
Language
Abstract
We have measured the spin structure functions g2p and g2d and the virtual photon asymmetries A2p and A2d over the kinematic range 0.02 < x < 0.8 and 0.7 < Q^2 < 20 GeV^2 by scattering 29.1 and 32.3 GeV longitudinally polarized electrons from transversely polarized NH3 and 6LiD targets. Our measured g2 approximately follows the twist-2 Wandzura-Wilczek calculation. The twist-3 reduced matrix elements d2p and d2n 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 A2 is significantly smaller than the sqrt[R(1+A1)/2] limit.
Type
Article
Description
The article of record as published may be found at https://doi.org/10.1016/S0370-2693(02)03015-0
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Department
Organization
Naval Postgraduate School (U.S.)
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Format
4 p.
Citation
Anthony, P. L., et al. "Precision measurement of the proton and deuteron spin structure functions g2 and asymmetries A2." Physics Letters B 553.1-2 (2003): 18-24.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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