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arXiv 0811.2067hep-phhep-th
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程函和次程函幂的路径积分方法

Path integral approach to eikonal and next-to-eikonal exponentiation

E. Laenen, G. Stavenga, C. D. White

摘要:

本文从路径积分的观点出发,讨论了软规范玻色子修正对散射振幅的指数化问题。我们表明,如果一个代表的振幅作为第一个量化的路径积分在混合坐标动量空间表示,带电粒子与软规范场相互作用表示为威尔逊线的半无限线段,连同可计算的波动。结合这样的线段,我们表明,指数在阿贝尔场论如下立即从标准的路径积分组合。在非阿贝尔情形下,我们考虑了具有两条外直线的色单重硬相互作用,得到了一个关于“网”的指数化的新观点,并给出了相应色因子的封闭形式解。我们调查和澄清的结构下程函修正。

英文摘要:

We approach the issue of exponentiation of soft gauge boson corrections to scattering amplitudes from a path integral point of view. We show that if one represents the amplitude as a first quantized path integral in a mixed coordinate-momentum space representation, a charged particle interacting with a soft gauge field is represented as a Wilson line for a semi-infinite line segment, together with calculable fluctuations. Combining such line segments, we show that exponentiation in an abelian field theory follows immediately from standard path-integral combinatorics. In the non-abelian case, we consider color singlet hard interactions with two outgoing external lines, and obtain a new viewpoint for exponentiation in terms of ``webs'', with a closed form solution for their corresponding color factors. We investigate and clarify the structure of next-to-eikonal corrections.

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