Precision Measurement of the Neutron Spin Asymmetry A1n
and Spin-Flavor Decomposition in the Valence Quark Region
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.
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, JP; Choi, S; Chudakov, E; Cusanno, F; De Leo, R; Deur, A; Dieterich, S; Dutta, D; Finn, JM; Frullani, S; Gao, H; Gao, J; Garibaldi, F; Gilad, S; Gilman, R; Gomez, J; Hansen, JO; 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, ZE; 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; Širca, 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; Zołnierczuk, PA
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