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

K. Abe et al. (E143 Collaboration)
Phys. Rev. Lett. 76, 587 – Published 22 January 1996
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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 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 theoretical predictions.

  • Received 26 September 1995

DOI:https://doi.org/10.1103/PhysRevLett.76.587

©1996 American Physical Society

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Vol. 76, Iss. 4 — 22 January 1996

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