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

E143 Collaboration

Research output: Contribution to journalArticlepeer-review

167 Citations (Scopus)


We have measured proton and deuteron virtual photon-nucleon asymmetries [Formula presented] and [Formula presented] and structure functions [Formula presented] and [Formula presented] over the range [Formula presented] and [Formula presented] 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, [Formula presented]. Twist-3 matrix elements have been extracted and are compared to theoretical predictions.

Original languageEnglish
Pages (from-to)587-591
Number of pages5
JournalPhysical review letters
Issue number4
Publication statusPublished - 1996

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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