Measurements of the proton and deuteron spin structure functions [Formula Presented] and [Formula Presented]

K. Abe, T. Akagi, P. L. Anthony, R. Antonov, R. G. Arnold, T. Averett, H. R. Band, J. M. Bauer, H. Borel, P. E. Bosted, V. Breton, J. Button-Shafer, J. P. Chen, T. E. Chupp, J. Clendenin, C. Comptour, K. P. Coulter, G. Court, D. Crabb, M. DaoudiD. Day, F. S. Dietrich, J. Dunne, H. Dutz, R. Erbacher, J. Fellbaum, A. Feltham, H. Fonvieille, E. Frlez, D. Garvey, R. Gearhart, J. Gomez, P. Grenier, K. A. Griffioen, S. Hoibraten, E. W. Hughes, C. Hyde-Wright, J. R. Johnson, D. Kawall, A. Klein, S. E. Kuhn, M. Kuriki, R. Lindgren, T. J. Liu, R. M. Lombard-Nelsen, J. Marroncle, T. Maruyama, X. K. Maruyama, J. McCarthy, W. Meyer, Z. Meziani, R. Minehart, J. Mitchell, J. Morgenstern, G. G. Petratos, R. Pitthan, D. Pocanic, C. Prescott, R. Prepost, P. Raines, B. Raue, D. Reyna, A. Rijllart, Y. Roblin, L. S. Rochester, S. E. Rock, O. A. Rondon, I. Sick, L. C. Smith, T. B. Smith, M. Spengos, F. Staley, P. Steiner, S. St. Lorant, L. M. Stuart, F. Suekane, Z. M. Szalata, H. Tang, Y. Terrien, T. Usher, D. Walz, F. Wesselmann, J. L. White, K. Witte, C. C. Young, B. Youngman, H. Yuta, G. Zapalac, B. Zihlmann, D. Zimmermann

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8 Citations (Scopus)

Abstract

Measurements are reported of the proton and deuteron spin structure functions [Formula Presented] and [Formula Presented] at beam energies of 29.1, 16.2, and 9.7 GeV, and [Formula Presented] and [Formula Presented] at a beam energy of 29.1 GeV. The integrals [Formula Presented] and [Formula Presented] were evaluated at fixed [Formula Presented] using the full data set to yield [Formula Presented] and [Formula Presented] The [Formula Presented] dependence of the ratio [Formula Presented] was studied and found to be small for [Formula Presented] Within experimental precision the [Formula Presented] data are well described by the twist-2 contribution, [Formula Presented] Twist-3 matrix elements were extracted and compared to theoretical predictions. The asymmetry [Formula Presented] was measured and found to be significantly smaller than the positivity limit [Formula Presented] for both proton and deuteron targets. [Formula Presented] is found to be positive and inconsistent with zero. Measurements of [Formula Presented] in the resonance region show strong variations with [Formula Presented] and [Formula Presented] consistent with resonant amplitudes extracted from unpolarized data. These data allow us to study the [Formula Presented] dependence of the integrals [Formula Presented] and [Formula Presented] below the scaling region.

Original languageEnglish
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume58
Issue number11
DOIs
Publication statusPublished - 1998

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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