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arXiv 1302.2732hep-th
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Yang-Mills理论中一般离壳振幅的边界行为

Boundary Behaviors for General Off-shell Amplitudes in Yang-Mills Theory

Yun Zhang, Gang Chen

摘要:

本文分析了Feynman规范中纯Yang-Mills振幅在相邻和非相邻BCFW位移下的边界行为。引入了Yang-Mills场的约化顶点,证明了这些约化顶点在边界性态的研究中与原点等价,从而大大简化了边界性态的分析.边界行为相邻的位移很容易得到使用减少顶点。然后证明了一个置换和定理,并用它证明了非相邻移位的改进的边界性质。基于边界行为,我们发现将BCFW递推关系推广到计算一般的树型拉平壳层振幅是可能的。

英文摘要:

In this article, we analyze the boundary behaviors of pure Yang-Mills amplitudes under adjacent and non adjacent BCFW shifts in Feynman gauge. We introduce reduced vertexes for Yang-Mills fields, prove that these reduced vertexes are equivalent to the original vertexes as for the study of boundary behaviors, which greatly simplifies our analysis of boundary behaviors. Boundary behaviors for adjacent shifts are readily obtained using reduced vertexes. Then we prove a theorem on permutation sum and use it to prove the improved boundary behaviors for non-adjacent shifts. Based on the boundary behaviors, we find that it is possible to generalize BCFW recursion relation to calculate general tree level off shell amplitudes.

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