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arXiv 1708.09405hep-phhep-ex
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QCD中t通道单顶夸克产生和次次次领头阶的微分分布

Differential Distributions for t-channel Single Top-Quark Production and Decay at Next-to-Next-to-Leading Order in QCD

Edmond L. Berger, Jun Gao, Hua Xing Zhu

摘要:

本文详细研究了在CERN大型强子对撞机(LHC)上进行的$t$通道单顶(反)夸克产生及其半轻子衰变的次次领头阶(NNLO)QCD修正.我们发现,在LHC与不同的质心能量的总的包容率的NNLO修正一般小于NLO修正,表明改进的收敛。然而,它们可以是大的微分分布,达到$10\%$或更高的水平在某些地区的横向动量分布的顶部(反)夸克和伪快度分布的领先喷流的事件。在所有情况下,扰动硬标度的不确定性大大减少后,包括NNLO修正。我们还显示了归一化的部分子能级分布的比较,最近的数据从8 TeV测量的ATLAS协作。NNLO修正倾向于使理论预测更接近于测量的顶(反)夸克的横向动量分布。重要的是,在13 TeV的大型强子对撞机,我们提出了NNLO截面在一个基准体积与衰变的顶夸克。

英文摘要:

We present a detailed phenomenological study of the next-to-next-to-leading order (NNLO) QCD corrections for $t$-channel single top (anti-)quark production and its semi-leptonic decay at the CERN Large Hadron Collider (LHC). We find the NNLO corrections for the total inclusive rates at the LHC with different center of mass energies are generally smaller than the NLO corrections, indicative of improved convergence. However, they can be large for differential distributions, reaching a level of $10\%$ or more in certain regions of the transverse momentum distributions of the top (anti-)quark and the pseudo-rapidity distributions of the leading jet in the event. In all cases the perturbative hard scale uncertainties are greatly reduced after the NNLO corrections are included. We also show a comparison of the normalized parton-level distributions to recent data from the 8 TeV measurement of the ATLAS Collaboration. The NNLO corrections tend to shift the theoretical predictions closer to the measured transverse momentum distribution of the top (anti)-quark. Importantly, for the LHC at 13 TeV, we present NNLO cross sections in a fiducial volume with decays of the top quark included.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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