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arXiv 0906.0460hep-ph
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理解遍举π+电生过程的一次尝试

An attempt to understand exclusive pi+ electroproduction

S. V. Goloskokov, P. Kroll

AI总结:

该研究在手袋方法下分析硬遍举π+电生过程,明确π介子极点的关键作用,指出实验数据需包含源于H_T和扭度-3π波函数的扭度-3效应,计算结果与极化靶实验数据吻合,并讨论了该方法对其他遍举电生过程的启示。

摘要:

本文在手袋(handbag)方法框架下研究了硬遍举π+电生过程,阐明了π介子极点贡献的突出作用。研究还表明,实验数据需要存在扭度-3效应,该效应源于螺旋度翻转的广义部分子分布H_T与扭度-3π介子波函数。文中将该手袋方法的计算结果,与极化靶测量得到的截面、自旋不对称性实验数据进行了详细比对,并评述了该方法对遍举π^0及矢量介子电生过程的意义。

英文摘要:

Hard exclusive pi+ electroproduction is investigated within the handbag approach. The prominent role of the pion-pole contribution is demonstrated. It is also shown that the experimental data require a twist-3 effect which ensues from the helicity-flip generalized parton distribution H_T and the twist-3 pion wave function. The results calculated from this handbag approach are compared in detail with the experimental data on cross sections and spin asymmetries measured with a polarized target. It is also commented on consequences of this approach for exclusive π^0 and vector-meson electroproduction.

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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