Precision measurement of the neutron spin asymmetryA(n)(1) and spin-flavor decomposition in the valence quark region.


Journal Article

We have measured the neutron spin asymmetry A(n)(1) with high precision at three kinematics in the deep inelastic region at x=0.33, 0.47, and 0.60, and Q(2)=2.7, 3.5, and 4.8 (GeV/c)(2), respectively. Our results unambiguously show, for the first time, that A(n)(1) crosses zero around x=0.47 and becomes significantly positive at x=0.60. Combined with the world proton data, polarized quark distributions were extracted. Our results, in general, agree with relativistic constituent quark models and with perturbative quantum chromodynamics (PQCD) analyses based on the earlier data. However they deviate from PQCD predictions based on hadron helicity conservation.

Full Text

Duke Authors

Cited Authors

  • Zheng, X; Aniol, K; Armstrong, DS; Averett, TD; Bertozzi, W; Binet, S; Burtin, E; Busato, E; Butuceanu, C; Calarco, J; Camsonne, A; Cates, GD; Chai, Z; Chen, J-P; Choi, S; Chudakov, E; Cusanno, F; Leo, RD; Deur, A; Dieterich, S; Dutta, D; Finn, JM; Frullani, S; Gao, H; Gao, J; Garibaldi, F; Gilad, S; Gilman, R; Gomez, J; Hansen, J-O; Higinbotham, DW; Hinton, W; Horn, T; De Jager, CW; Jiang, X; Kaufman, L; Kelly, J; Korsch, W; Kramer, K; LeRose, J; Lhuillier, D; Liyanage, N; Margaziotis, DJ; Marie, F; Markowitz, P; McCormick, K; Meziani, Z-E; Michaels, R; Moffit, B; Nanda, S; Neyret, D; Phillips, SK; Powell, A; Pussieux, T; Reitz, B; Roche, J; Roche, R; Roedelbronn, M; Ron, G; Rvachev, M; Saha, A; Savvinov, N; Singh, J; Sirca, S; Slifer, K; Solvignon, P; Souder, P; Steiner, DJ; Strauch, S; Sulkosky, V; Tobias, A; Urciuoli, G; Vacheret, A; Wojtsekhowski, B; Xiang, H; Xiao, Y; Xiong, F; Zhang, B; Zhu, L; Zhu, X; ZoĹ‚nierczuk, PA; Jefferson Lab Hall A Collaboration,

Published Date

  • January 7, 2004

Published In

Volume / Issue

  • 92 / 1

Start / End Page

  • 012004 -

PubMed ID

  • 14753984

Pubmed Central ID

  • 14753984

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.92.012004


  • eng