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arXiv 1606.05697hep-ph
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多分支散射振幅中的长距离奇异性

Long-distance singularities in multi-leg scattering amplitudes

Einan Gardi, Øyvind Almelid, Claude Duhr

摘要:

我们报告了最近完成的无质量规范理论散射振幅中软反常维数的三圈计算。这使得国家的最先进的知识,在多腿QCD振幅与任何数量的无质量粒子的长距离奇异性的三个循环。结果显示了一些新的特点:这是第一次出现非偶极校正,直接关联的颜色和运动自由度的四个有色部分子。我们发现,非偶极校正出现在三个循环也为三个有色部分子,但这些是独立的运动学。当用单值调和多项式表示时,最终结果非常简单,并且满足几个非平凡的约束。特别是,它是一致的高能量极限行为,它满足预期的因式分解性质在两个粒子共线限制。

英文摘要:

We report on the recent completion of the three-loop calculation of the soft anomalous dimension in massless gauge-theory scattering amplitudes. This brings the state-of-the-art knowledge of long-distance singularities in multi-leg QCD amplitudes with any number of massless particles to three loops. The result displays some novel features: this is the first time non-dipole corrections appear, which directly correlate the colour and kinematic degrees of freedom of four coloured partons. We find that non-dipole corrections appear at three loops also for three coloured partons, but these are independent of the kinematics. The final result is remarkably simple when expressed in terms of single-valued harmonic polylogarithms, and it satisfies several non-trivial constraints. In particular, it is consistent with the high-energy limit behaviour and it satisfies the expected factorization properties in two-particle collinear limits.

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