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arXiv 1608.04730hep-thhep-ph
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散射方程首阶以外的共线极限

Collinear limits beyond the leading order from the scattering equations

Dhritiman Nandan, Jan Plefka, Wadim Wormsbecher

摘要:

研究了共线无质量玻色子在主导分裂函数行为之外的树能级散射振幅结构。这些近共线的限制,在次领导阶最好的研究使用Cachazo-He-Yuan(CHY)制定的S-矩阵的散射方程的基础上。我们计算了胶子、引力子和标量的共线极限。结果表明,在次超前阶共线极限下,n粒子胶子散射振幅的CHY被积函数表示为一个n-1粒子胶子被积函数与一个共线核被积函数的卷积,具有普适性.我们的表示服从最近提出的振幅关系,其中相同螺旋度的共线胶子被替换为单个引力子。最后,我们将分析推广到有效场论,研究了非线性西格玛模型、Einstein-Maxwell-Scalar和Yang-Mills-Scalar理论的共线极限。

英文摘要:

The structure of tree-level scattering amplitudes for collinear massless bosons is studied beyond their leading splitting function behavior. These near-collinear limits at sub-leading order are best studied using the Cachazo-He-Yuan (CHY) formulation of the S-matrix based on the scattering equations. We compute the collinear limits for gluons, gravitons and scalars. It is shown that the CHY integrand for an n-particle gluon scattering amplitude in the collinear limit at sub-leading order is expressed as a convolution of an (n-1)-particle gluon integrand and a collinear kernel integrand, which is universal. Our representation is shown to obey recently proposed amplitude relations in which the collinear gluons of same helicity are replaced by a single graviton. Finally, we extend our analysis to effective field theories and study the collinear limit of the non-linear sigma model, Einstein-Maxwell-Scalar and Yang-Mills-Scalar theory.

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