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arXiv 0903.0569hep-ph
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互斥过程中低能胶子的因式分解

Factorization of low-energy gluons in exclusive processes

Geoffrey T. Bodwin, Xavier Garcia i Tormo, Jungil Lee

摘要:

我们概述了一个证明的因素分解在排他性的过程中,考虑到存在的软和共线模式的任意低的能量,这产生时,外部线路的过程中采取壳。具体地说,我们研究了e^+e^-湮灭通过虚光子到两个轻介子的过程。在中间步骤中,我们建立了一个因子分解的形式,其中包含一个软函数,是免费的共线发散。相比之下,在软共线有效理论中,低能共线模式最直接地影响软函数。我们指出,软函数的取消,这依赖于外部强子的色单态性质,失败时,软函数包含低能量共线模式。

英文摘要:

We outline a proof of factorization in exclusive processes, taking into account the presence of soft and collinear modes of arbitrarily low energy, which arise when the external lines of the process are taken on shell. Specifically, we examine the process of e^+e^- annihilation through a virtual photon into two light mesons. In an intermediate step, we establish a factorized form that contains a soft function that is free of collinear divergences. In contrast, in soft-collinear effective theory, the low-energy collinear modes factor most straightforwardly into the soft function. We point out that the cancellation of the soft function, which relies on the color-singlet nature of the external hadrons, fails when the soft function contains low-energy collinear modes.

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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