Precision measurement of the proton spin structure function g1p

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. E. 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, J. L. White, K. Witte, C. C. Young, B. Youngman, H. Yuta, G. Zapalac, B. Zihlmann, D. Zimmermann

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389 Citations (Scopus)

Abstract

We have measured the ratio g1pF1p over the range 0.029<x<0.8 and 1.3<Q2<10 (GeV/c)2 using deep-inelastic scattering of polarized electrons from polarized ammonia. An evaluation of the integral >01g1p(x,>Q2) dx at fixed Q2=3 (GeV/c)2 yields 0.127±0.004(stat)±0.010(syst), in agreement with previous experiments, but well below the Ellis-Jaffe sum rule prediction of 0.160±0.006. In the quark-parton model, this implies Δq=0.27±0.10.

Original languageEnglish
Pages (from-to)346-350
Number of pages5
JournalPhysical review letters
Volume74
Issue number3
DOIs
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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