论文标题
重新访问无质量QCD中一环振幅的双重渐近渐近学
Revisiting the double-soft asymptotics of one-loop amplitudes in massless QCD
论文作者
论文摘要
我们评估了在无质量量子染色体动力学中发射两个软纤维或一个软夸克 - 夸克对的一环软电流。结果在尺寸正则化中精确，直至单个Feynman积分。后一个积分的泰勒级数的两个术语是$ε\ equiv（4-d）/2 $带有$ d $的函数，时空的尺寸可从最新计算的一环三下拆分函数获得。我们的公式对于构建减法方案是必要的，以评估无质量QCD中的近代到接头到领先的订单横截面。
We evaluate the one-loop soft current for the emission of two soft gluons or a soft quark-anti-quark pair in massless Quantum Chromodynamics. The results are exact in dimensional regularisation up to a single Feynman integral. Two terms of the Taylor series of the latter integral as a function of $ε\equiv (4-d)/2$ with $d$ the dimension of spacetime are available from a recent calculation of one-loop triple-collinear splitting functions. Our formulae are necessary for the construction of a subtraction scheme for the evaluation of next-to-next-to-next-to-leading order cross sections in massless QCD.
