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arXiv 0905.4379hep-th
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N=4 SYM理论中单圈NMHV振幅的对偶共形对称性

Dual conformal symmetry of 1-loop NMHV amplitudes in N=4 SYM theory

Henriette Elvang, Daniel Z. Freedman, Michael Kiermaier

摘要:

我们证明了在N=4 SYM理论中,1-loop n点NMHV超振幅对于所有外部粒子数n都是对偶共形协变的(经过正则化和减去IR发散)。该性质先前在arXiv:0808.0491中针对n < 10建立。我们推导出一个明确的表示,这些超级振幅的对偶共形交比。我们还表明,所有的1-loop '盒系数'从最大削减N^kMHV n-点函数的对偶保形变换下的协变。

英文摘要:

We prove that 1-loop n-point NMHV superamplitudes in N=4 SYM theory are dual conformal covariant for all numbers n of external particles (after regularization and subtraction of IR divergences). This property was previously established for n < 10 in arXiv:0808.0491. We derive an explicit representation of these superamplitudes in terms of dual conformal cross-ratios. We also show that all the 1-loop `box coefficients' obtained from maximal cuts of N^kMHV n-point functions are covariant under dual conformal transformations.

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