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arXiv 0903.4962hep-ph
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固定Q^2(1-x)时的QCD因子分解

QCD factorization at fixed Q^2(1-x)

Paul Hoyer

摘要:

硬{ \it exclusive}过程的振幅,例如γ^*(Q^2)N \to γY,其中Y=N(DVCS)或具有有限质量(M_Y^2 << Q^2)的任何其他状态,分解为硬子过程振幅和目标(转变)GPD。相应的{ \it含}截面,在给定(有限)质量的所有状态Y上求和,然后由前向多部分子分布的不连续性给出。应用Drell-Yan过程π^+ N \to γ^*(x_F,Q^2)+Y可以解释在高x_F时观察到的虚光子的纵向偏振。

英文摘要:

Amplitudes of hard {\it exclusive} processes such as γ^*(Q^2) N \to γY, where Y=N (DVCS) or any other state with a limited mass (M_Y^2 << Q^2), factorize into a hard subprocess amplitude and a target (transition) GPD. The corresponding {\it inclusive} cross section, summed over all states Y of a given (limited) mass, is then given by the discontinuity of a forward multiparton distribution. An application to the Drell-Yan process π^+ N \to γ^*(x_F,Q^2)+Y allows to explain the observed longitudinal polarization of the virtual photon at high x_F.

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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