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arXiv 1408.5243hep-phhep-ex
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在NNLO QCD的强子对撞机上生产$W^+W^-$

$W^+W^-$ production at hadron colliders in NNLO QCD

T. Gehrmann, M. Grazzini, S. Kallweit, P. Maierhöfer, A. von Manteuffel, S. Pozzorini, D. Rathlev, L. Tancredi

摘要:

在大型强子对撞机上产生的带电规范玻色子对允许详细探测电弱相互作用的基本结构。我们提出了精确的理论预测上壳层$W^+W^-$生产,包括,第一次,QCD效应下到领导阶微扰理论。与次领先阶相比,包含的$W^+W^-$截面在7 TeV和14 TeV分别增加了9%和12%。剩余扰动不确定度在3%水平。详细讨论了顶夸克共振对$W^+W^-$截面的严重污染。通过比较四味数方案和五味数方案中不同的无顶$W^+W^-$产生定义,我们证明了顶夸克共振可以从包含的$W^+W^-$截面中分离出来,而不会显著损失理论精度.

英文摘要:

Charged gauge boson pair production at the Large Hadron Collider allows detailed probes of the fundamental structure of electroweak interactions. We present precise theoretical predictions for on-shell $W^+W^-$ production that include, for the first time, QCD effects up to next-to-next-to-leading order in perturbation theory. As compared to next-to-leading order, the inclusive $W^+W^-$ cross section is enhanced by 9% at 7 TeV and 12% at 14 TeV. The residual perturbative uncertainty is at the 3% level. The severe contamination of the $W^+W^-$ cross section due to top-quark resonances is discussed in detail. Comparing different definitions of top-free $W^+W^-$ production in the four and five flavour number schemes, we demonstrate that top-quark resonances can be separated from the inclusive $W^+W^-$ cross section without significant loss of theoretical precision.

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