Measurements of the Proton and Deuteron Spin Structure Function g2 and Asymmetry A2

Abstract

We have measured proton and deuteron virtual photon-nucleon asymmetries A2p and A2d and structure functions g2p and g2d over the range 0.03<x<0.8 and 1.3<Q2<10 (GeV/c)2 by inelastically scattering polarized electrons off polarized ammonia targets. Results for A2 are significantly smaller than the positivity limit sqrt(R) for both targets. Within experimental precision, the g2 data are well-described by the twist-2 contribution g2WW. Twist-3 matrix elements have been extracted and are compared to theorectical predictions.

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References in corpus (7)

• The theory and phenomenology of polarized deep inelastic scattering
• Measurement of the Spin-Dependent Structure Function $g_1(x)$ of the Proton
• Determination of ${\alpha }_s$ and the Nucleon Spin Decomposition Using Recent Polarized Structure Function Data
• ERRATUM TO: Power corrections $1/Q^2$ to parton sum rules for deep inelastic scattering from polarized targets
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• QCD Sum Rule Calculation of Twist-3 Contributions to Polarized Nucleon Structure Functions
• A model for the $Q^2$ dependence of polarized structure functions

Cited by in corpus (101)

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• The QCD Running Coupling
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• Spin Physics and Polarized Structure Functions
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• Effective charge from lattice QCD
• A high-precision polarimeter
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• Polarized Nucleon Structure Functions within a Chiral Soliton Model
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