Precision Measurement of the Neutron Spin Asymmetry A1 n and Spin-Flavor Decomposition in the Valence Quark Region

X. Zheng, K. Aniol, D. S. Armstrong, T. D. Averett, W. Bertozzi, S. Binet, E. Burtin, E. Busato, C. Butuceanu, J. Calarco, A. Camsonne, G. D. Cates, Z. Chai, J. P. Chen, Seonho Choi, E. Chudakov, F. Cusanno, R. De Leo, A. Deur, S. DieterichD. Dutta, J. M. Finn, S. Frullani, H. Gao, J. Gao, F. Garibaldi, S. Gilad, R. Gilman, J. Gomez, J. O. Hansen, D. W. Higinbotham, W. Hinton, T. Horn, C. W. De Jager, X. Jiang, L. Kaufman, J. Kelly, W. Korsch, K. Kramer, J. LeRose, D. Lhuillier, N. Liyanage, D. J. Margaziotis, F. Marie, P. Markowitz, K. McCormick, Z. E. Meziani, R. Michaels, B. Moffit, S. Nanda, D. Neyret, S. K. Phillips, A. Powell, T. Pussieux, B. Reitz, J. Roche, R. Roche, M. Roedelbronn, G. Ron, M. Rvachev, A. Saha, N. Savvinov, J. Singh, S. Širca, K. Slifer, P. Solvignon, P. Souder, D. J. Steiner, S. Strauch, V. Sulkosky, A. Tobias, G. Urciuoli, A. Vacheret, B. Wojtsekhowski, H. Xiang, Y. Xiao, F. Xiong, B. Zhang, L. Zhu, X. Zhu, P. A. Zołnierczuk

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Abstract

The neutron spin asymmetry A1n with high precision at three kinematic in the deep inelastic region at x=0.33, 0.47 and Q 2=2.7, 3.5 and 4.8(GeV/c)2, respectively was measured. It was shown that A1n crosses zero around x=0.47 and becomes significantly positive at x=0.60. The polarized quark distributions, combined with the world proton data were also extracted. The hadron helicity conservation (HHC) mechanism, based on leading-order perturbative quantum chromodynamics (PQCD), where the quark orbital angular momentum (OAM) was assumed to be zero was discussed.

Original languageEnglish (US)
Article number012004
Pages (from-to)120041-120045
Number of pages5
JournalPhysical Review Letters
Volume92
Issue number1
StatePublished - Jan 9 2004

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Zheng, X., Aniol, K., Armstrong, D. S., Averett, T. D., Bertozzi, W., Binet, S., Burtin, E., Busato, E., Butuceanu, C., Calarco, J., Camsonne, A., Cates, G. D., Chai, Z., Chen, J. P., Choi, S., Chudakov, E., Cusanno, F., De Leo, R., Deur, A., ... Zołnierczuk, P. A. (2004). Precision Measurement of the Neutron Spin Asymmetry A1 n and Spin-Flavor Decomposition in the Valence Quark Region. Physical Review Letters, 92(1), 120041-120045. [012004].