Measurement of the neutron spin structure function gn2 and asymmetry An2

K. Abe, T. Akagi, B. D. Anderson, P. L. Anthony, R. G. Arnold, T. Averett, H. R. Band, C. M. Berisso, P. Bogorad, H. Borel, P. E. Bosted, V. Breton, M. J. Buenerd, G. D. Cates, T. E. Chupp, S. Churchwell, K. P. Coulter, M. Daoudi, P. Decowski, R. EricksonJ. N. Fellbaum, H. Fonvieille, R. Gearhart, V. Ghazikhanian, K. A. Griffioen, R. S. Hicks, R. Holmes, E. W. Hughes, G. Igo, S. Incerti, J. R. Johnson, W. Kahl, M. Khayat, Yu G. Kolomensky, S. E. Kuhn, K. Kumar, M. Kuriki, R. Lombard-Nelsen, D. M. Manley, J. Marroncle, T. Maruyama, T. Marvin, W. Meyer, Z. E. Meziani, D. Miller, G. Mitchell, M. Olson, G. A. Peterson, G. G. Petratos, R. Pitthan, R. Prepost, P. Raines, B. A. Raue, D. Reyna, L. S. Rochester, S. E. Rock, M. V. Romalis, F. Sabatie, G. Shapiro, J. Shaw, T. B. Smith, L. Sorrell, P. A. Souder, F. Staley, S. St. Lorant, L. M. Stuart, F. Suekane, Z. M. Szalata, Y. Terrien, A. K. Thompson, T. Toole, X. Wang, J. W. Watson, R. C. Welsh, F. R. Wesselmann, T. Wright, C. C. Young, B. Youngman, H. Yuta, W. M. Zhang, P. Zyla

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We have measured the neutron structure function gn2 and the virtual photon-nucleon asymmetry An2 over the kinematic range 0.014 ≤ x ≤ 0.7 and 1.0 ≤ Q2 ≤ 17.0 by scattering 48.3 GeV longitudinally polarized electrons from polarized 3He. Results for An2 are significantly smaller than the √R positivity limit over most of the measured range and data for gn2 are generally consistent with the twist-2 Wandzura-Wilczek prediction. Using our measured gn2 we obtain results for the twist-3 reduced matrix element dn2, and the integral ∫ gn2(x) dx in the range 0.014 ≤ x ≤ 1.0. Data from this experiment are combined with existing data for gn2 to obtain an average for dn2 and the integral ∫ gn2(x) dx.

Original languageEnglish
Pages (from-to)377-382
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
Publication statusPublished - 1997 Jul 10

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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