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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2007.05345hep-ph
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胶子分裂为四个共线部分子的树级分裂幅度

Tree-level splitting amplitudes for a gluon into four collinear partons

Vittorio Del Duca, Claude Duhr, Rayan Haindl, Achilleas Lazopoulos, Martin Michel

摘要:

我们计算在传统的维正则化的树级分裂振幅的胶子父分裂成四个共线部分子。这是在强耦合常数下,次-领先阶(N $^3$ LO)的QCD散射振幅的普遍红外行为的一部分。结合我们先前对夸克母体的结果,这就完成了这个量级所需的树级分裂振幅。我们还研究了迭代共线限制的四个共线部分子的子集成为自己的共线。

英文摘要:

We compute in conventional dimensional regularisation the tree-level splitting amplitudes for a gluon parent which splits into four collinear partons. This is part of the universal infrared behaviour of the QCD scattering amplitudes at next- to-next-to-next-to-leading order (N$^3$LO) in the strong coupling constant. Combined with our earlier results for a quark parent, this completes the set of tree-level splitting amplitudes required at this order. We also study iterated collinear limits where a subset of the four collinear partons become themselves collinear.

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