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arXiv 0712.4138hep-th
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六胶子振幅的六角威尔逊圈和BDS不确定性

The hexagon Wilson loop and the BDS ansatz for the six-gluon amplitude

J. M. Drummond, J. Henn, G. P. Korchemsky, E. Sokatchev

摘要:

作为胶子散射振幅/威尔逊圈对偶性的检验,我们计算了N=4超杨-米尔斯理论中两圈处的六角类光威尔逊圈.我们比较它的有限部分的Bern-Dixon-Smirnov(BDS)猜想的有限部分的六胶子振幅。我们发现,这两个表达式具有相同的行为在共线极限,但他们不同的三个(对偶)共形不变变量的非平凡函数。这意味着,无论是BDS猜想或胶子振幅/威尔逊圈对偶失败的六胶子振幅,从两个循环。我们的结果与Alday和Maldacena关于无穷多个外胶子的散射振幅的分析定性一致。

英文摘要:

As a test of the gluon scattering amplitude/Wilson loop duality, we evaluate the hexagonal light-like Wilson loop at two loops in N=4 super Yang-Mills theory. We compare its finite part to the Bern-Dixon-Smirnov (BDS) conjecture for the finite part of the six-gluon amplitude. We find that the two expressions have the same behavior in the collinear limit, but they differ by a non-trivial function of the three (dual) conformally invariant variables. This implies that either the BDS conjecture or the gluon amplitude/Wilson loop duality fails for the six-gluon amplitude, starting from two loops. Our results are in qualitative agreement with the analysis of Alday and Maldacena of scattering amplitudes with infinitely many external gluons.

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