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

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.

12 pages, 4 figures, 2 tables

References in corpus (24)

• Measurements of the Proton and Deuteron Spin Structure Functions g1 and g2
• Precision Determination of the Neutron Spin Structure Function g1n
• Measurement of the Neutron Spin Structure Function $g_1^n$ with a Polarized ^3He Target
• Deep Inelastic Scattering of Polarized Electrons by Polarized ${}^3$He and the Study of the Neutron Spin Structure
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• Measurement of the Proton Spin Structure Function g1p with a Pure Hydrogen Target
• Measurement of the proton and the deuteron structure functions F2p and F2d
• Measurement of the Deuteron Spin Structure Function g_1^d(x) for 1 (GeV/c)^2 < Q^2 < 40 (GeV/c)^2
• Measurements of the Proton and Deuteron Spin Structure Function g2 and Asymmetry A2
• ERRATUM TO: Power corrections $1/Q^2$ to parton sum rules for deep inelastic scattering from polarized targets
• Measurements of R=sigma_L/sigma_T for 0.03<x<0.1 and Fit to World Data
• Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetry A2
• Spin Asymmetry in Muon--Proton Deep Inelastic Scattering on a Transversely-Polarized Target
• Q^2-Dependence of the Proton's G_1 Structure Function Sum Rule
• Measurement of the Neutron Spin Structure Function g2n and Asymmetry A2n
• QCD Sum Rule Calculation of Twist-3 Contributions to Polarized Nucleon Structure Functions
• A lattice calculation of the nucleon's spin-dependent structure function g_2 revisited
• Instanton contributions to the $\tau$ decay widths
• An exact sum rule for transversely polarized DIS
• Polarized structure function $g_2$ in the CM bag model
• Polarized Structure Functions g_2 (x) in the Chiral Quark Soliton Model
• Positivity constraints and flavor dependence of higher twists
• A model for the $Q^2$ dependence of polarized structure functions
• Hadron Structure Functions within a Chiral Quark Model

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• Measurement of Parton Distributions of Strange Quarks in the Nucleon from Charged-Kaon Production in Deep-Inelastic Scattering on the Deuteron
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• The Spin Structure Function $g_1^{\mathrm{p}}$ of the Proton and a Test of the Bjorken Sum Rule
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