Precision measurement of the deuteron spin structure function g1d

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. 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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214 Citations (Scopus)

Abstract

We report on a high-statistics measurement of the deuteron spin structure function g1d at a beam energy of 29 GeV in the kinematic range 0.029<x<0.8 and 1<Q2<10 (GeV /c)2. The integral γ1d=1g1d dx evaluated at fixed Q2=3 (GeV /c)2 gives 0.042±0.003(stat)±0.004(syst). Combining this result with our earlier measurement of g1p, we find γ1p-γ1n=0. 163±0.010(stat)±0.016(syst), which agrees with the prediction of the Bjorken sum rule with O(αs3) corrections, γ1p-γ1n=0. 171±0.008. We find the quark contribution to the proton helicity to be Δq=0.30±0.06.

Original languageEnglish
Pages (from-to)25-28
Number of pages4
JournalPhysical review letters
Volume75
Issue number1
DOIs
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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