Precision Measurement of the Neutron Spin Asymmetry[Formula presented] 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. Żołnierczuk

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We have measured the neutron spin asymmetry [Formula presented] with high precision at three kinematics in the deep inelastic region at [Formula presented], [Formula presented], and [Formula presented], and [Formula presented], [Formula presented], and [Formula presented], respectively. Our results unambiguously show, for the first time, that [Formula presented] crosses zero around [Formula presented] and becomes significantly positive at [Formula presented]. 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.

Original languageEnglish (US)
Number of pages1
JournalPhysical Review Letters
Volume92
Issue number1
DOIs
StatePublished - 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., ... Żołnierczuk, P. A. (2004). Precision Measurement of the Neutron Spin Asymmetry[Formula presented] and Spin-Flavor Decomposition in the Valence Quark Region. Physical Review Letters, 92(1). https://doi.org/10.1103/PhysRevLett.92.012004