Precision Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetries A2

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dc.creatorSLAC E155 Collaboration
dc.creatorAnthony, P. L.
dc.creatorArnold, R. G.
dc.creatorAverett, T.
dc.date2002-04-22
dc.date.accessioned2026-07-07T12:01:45Z
dc.date.available2026-07-07T12:01:45Z
dc.descriptionWe 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.
dc.description12 pages, 4 figures, 2 tables
dc.identifierhttps://arxiv.org/abs/hep-ex/0204028
dc.identifierhttp://arxiv.org/abs/hep-ex/0204028
dc.identifierPhys.Lett.B553:18-24,2003
dc.identifierdoi:10.1016/S0370-2693(02)03015-0
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207203
dc.subjectHigh Energy Physics - Experiment
dc.titlePrecision Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetries A2
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