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arXiv 0907.2942hep-ph
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什么能打破万祖拉-威尔切克关系?

What can break the Wandzura--Wilczek relation?

Alberto Accardi, Alessandro Bacchetta, W. Melnitchouk, Marc Schlegel

摘要:

我们分析了G_2结构函数的Wandzura-Wilczek关系的破缺,强调了它与横动量相关的部分子分布函数的联系。我们发现,这种关系被两个不同的扭曲-3项打破,并澄清这些如何可以在半包容性深非弹性散射的双自旋不对称性的测量中分离。通过对现有g_2数据的定量分析,我们还表明,Wandzura-Wilczek关系的破缺可以达到g_2大小的15-30%。

英文摘要:

We analyze the breaking of the Wandzura-Wilczek relation for the g_2 structure function, emphasizing its connection with transverse momentum dependent parton distribution functions. We find that the relation is broken by two distinct twist-3 terms, and clarify how these can be separated in measurements of double-spin asymmetries in semi-inclusive deep inelastic scattering. Through a quantitative analysis of available g_2 data we also show that the breaking of the Wandzura-Wilczek relation can be as large as 15-30% of the size of g_2.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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