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arXiv 1409.3148hep-ph
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夸克-反夸克通道中顶-反顶产生的光费米子NNLO QCD修正

Light fermionic NNLO QCD corrections to top-antitop production in the quark-antiquark channel

Gabriel Abelof, Aude Gehrmann-De Ridder

摘要:

我们给出了夸克-反夸克通道中顶对产生的NNLO修正与轻夸克味数$N_l$成正比。虽然双实修正是以前得到的,在这里,我们计算的实虚和虚虚的贡献,在这个部分子通道。使用天线减法形式主义,我们表明,减法项正确地近似实虚贡献在所有的红外限制。结合双实和实虚相减项的积分形式,我们分别解析地证明了显式红外极点在实虚和虚虚水平上的抵消,从而证明了NNLO天线形式主义的大规模扩展的有效性.这些NNLO校正是在蒙特卡罗部分子水平发生器中实现的,该发生器在逐事件的基础上提供完整的运动学信息。用这个程序,NNLO微分分布的形式分箱直方图获得,并在这里提出。

英文摘要:

We present the NNLO corrections to top pair production in the quark-antiquark channel proportional to the number of light quark flavors $N_l$. While the double real corrections were derived previously, here we compute the real-virtual and virtual-virtual contributions in this partonic channel. Using the antenna subtraction formalism, we show that the subtraction terms correctly approximate the real-virtual contributions in all their infrared limits. Combined with the integrated forms of the double real and real-virtual subtraction terms, we show analytically that the explicit infrared poles cancel at the real-virtual and virtual-virtual levels respectively, thereby demonstrating the validity of the massive extension of the NNLO antenna formalism. These NNLO corrections are implemented in a Monte Carlo parton level generator providing full kinematical information on an event-by event basis. With this program, NNLO differential distributions in the form of binned histograms are obtained and presented here.

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