论文标题
Higgs Boson的生产与近代领先订单QCD的顶级夸克对结合
Higgs boson production in association with a top-antitop quark pair in next-to-next-to leading order QCD
论文作者
论文摘要
HIGGS玻色子与顶部夸克对的相关产生是LHC的关键过程，因为它允许直接测量顶级Quark Yukawa耦合。我们在QCD扰动理论中介绍了该过程对此过程的辐射校正的计算。这是按照此扰动顺序的$ 2 \至3 $工艺的第一个计算。我们为环路振幅开发了一个软希格斯玻色子近似，这使我们能够可靠地量化尚未知道的两环贡献的影响。在质量中心能量$ \ sqrt {s} = 13 $ tev上，nnlo校正增加了总横截面的临近订单结果约4％，并导致扰动不确定性的显着降低。
The associated production of a Higgs boson with a top-antitop quark pair is a crucial process at the LHC since it allows for a direct measurement of the top-quark Yukawa coupling. We present the computation of the radiative corrections to this process at the next-to-next-to-leading order (NNLO) in QCD perturbation theory. This is the very first computation for a $2 \to 3$ process with massive coloured particles at this perturbative order. We develop a soft Higgs boson approximation for loop amplitudes, which enables us to reliably quantify the impact of the yet unknown two-loop contribution. At the centre-of-mass energy $\sqrt{s}=13$ TeV the NNLO corrections increase the next-to-leading order result for the total cross section by about 4% and lead to a significant reduction of perturbative uncertainties.
