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arXiv 0707.0243hep-thhep-ph
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四胶子平面振幅和威尔逊圈的共形性质

Conformal properties of four-gluon planar amplitudes and Wilson loops

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

摘要:

进一步证明了N=4 SYM中四胶子平面散射振幅的对偶共形对称性。我们发现,所有的动量积分出现在微扰的壳计算多达五个循环是对偶的真正的共形积分,以及定义壳外。假设完整的离壳振幅具有这种对偶共形对称性,并利用红外发散因子分解的基本性质,我们推导出了以前在弱耦合下发现的有限余项的特殊形式,最近在强耦合下由AdS/CFT再现。我们表明,同样的有限项出现在一个威尔逊圈的轮廓由四个轻的类段与胶子动量的弱耦合计算。我们还证明,由于有限余项的特殊形式,四胶子振幅的渐近Regge极限与Mandelivery变量的任意值的精确表达式相吻合。

英文摘要:

We present further evidence for a dual conformal symmetry in the four-gluon planar scattering amplitude in N=4 SYM. We show that all the momentum integrals appearing in the perturbative on-shell calculations up to five loops are dual to true conformal integrals, well defined off shell. Assuming that the complete off-shell amplitude has this dual conformal symmetry and using the basic properties of factorization of infrared divergences, we derive the special form of the finite remainder previously found at weak coupling and recently reproduced at strong coupling by AdS/CFT. We show that the same finite term appears in a weak coupling calculation of a Wilson loop whose contour consists of four light-like segments associated with the gluon momenta. We also demonstrate that, due to the special form of the finite remainder, the asymptotic Regge limit of the four-gluon amplitude coincides with the exact expression evaluated for arbitrary values of the Mandelstam variables.

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