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arXiv 1002.4625hep-th
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N=4 SYM理论中散射振幅的超共形不变量

Superconformal invariants for scattering amplitudes in N=4 SYM theory

G. P. Korchemsky, E. Sokatchev

摘要:

最近对平面N=4 SYM理论中散射振幅的研究揭示了隐藏的对偶超共形对称性的存在。与传统的超共形对称性一起,它对所有回路的平面散射振幅产生了强有力的限制。我们研究这两种对称的不变量的一般形式。我们首先构造一个最一般的对偶超共形不变量的积分表示,并表明它允许相当大的自由度的选择的集成措施。然后,我们进行了半傅立叶变换扭量空间,传统的共形对称实现本地,得到共形沃德恒等式的集成措施,并表明它承认一个唯一的解决方案。因此,对偶和传统的超共形对称性的结合,以及螺旋度重标度下的不变性,完全固定了不变量的形式。所得到的表达式推广了已知的树和单圈超共形不变量,并与最近提出的散射振幅作为Grassmannian上的围道积分的主导奇点的系数相一致。

英文摘要:

Recent studies of scattering amplitudes in planar N=4 SYM theory revealed the existence of a hidden dual superconformal symmetry. Together with the conventional superconformal symmetry it gives rise to powerful restrictions on the planar scattering amplitudes to all loops. We study the general form of the invariants of both symmetries. We first construct an integral representation for the most general dual superconformal invariants and show that it allows a considerable freedom in the choice of the integration measure. We then perform a half-Fourier transform to twistor space, where conventional conformal symmetry is realized locally, derive the resulting conformal Ward identity for the integration measure and show that it admits a unique solution. Thus, the combination of dual and conventional superconformal symmetries, together with invariance under helicity rescalings, completely fixes the form of the invariants. The expressions obtained generalize the known tree and one-loop superconformal invariants and coincide with the recently proposed coefficients of the leading singularities of the scattering amplitudes as contour integrals over Grassmannians.

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