Latest Results on g1 and g2 at High x.

Chen, J. P.

Technical Information Center Oak Ridge Tennessee

关键词: Neutrons;    Nucleons;    Quarks;    Accuracy;    Asymmetry;   

RP-ID  :  DE2005842292

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Recent progress from Jefferson Lab has significantly improved our understanding of the nucleon spin structure in the high-x region. Results of a precision measurement of the neutron spin asymmetry, A(sub 1)(sup n), in the high-x (valence quark) region are discussed. The up and down quark spin distributions in the nucleon were extracted. A(sub 2)(sup n) was also measured in the same experiment. The results were used, in combination with existing data, to extract the second moment of the spin structure function d(sub 2)(sup n). Preliminary results on A(sub 1)(sup p) and A(sub 1)(sup d) in the high-x region have also become available. Finally, the results of a precision measurement of the g(sub 2) structure function to study higher twist effects will be presented.