Quark-hadron Duality: Higher Twists and Large-X Structure.

Melnitchouk, W.

Technical Information Center Oak Ridge Tennessee

关键词: Quark hadron duality;    Electron scattering;    Resonance regions;    Spin structure functions;    Twists;   

RP-ID  :  DE2005839147

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The author reviewed recent developments in the study of quark-hadron duality in inclusive electron scattering in the resonance-scaling transition region. Results on matrix elements of twist-4 operators extracted from moments of the spin-dependent g(sub 1) structure function suggest that duality violating higher twists are small above Q(sup 2) (approx) 1 GeV(sup 2). The systematics of the x dependence of local duality are analyzed within a quark model framework, and mechanisms are identified for spin-flavor symmetry breaking which underpin the behavior of structure functions at large x.