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arXiv 2008.00918hep-phhep-ex
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完整的NLO QCD对壳外ttbb生产的纠正

Full NLO QCD corrections to off-shell ttbb production

Ansgar Denner, Jean-Nicolas Lang, Mathieu Pellen

摘要:

在这篇文章中,我们报告了在LHC上计算${\rm p}{\rm p} \to μ^-\barν_μ{\rm e}^+ν_{\rm e}\bar{\rm b}{\rm b}\bar{\rm b}{\rm b}$的NLO QCD修正,这是${\rm p}{\rm p}\to{\rm t}\bar{\rm t}{\rm H}\bigl(\to{\rm b}\bar{\rm b}\bigr)$的不可约背景。这是第一次公开一个完整的NLO计算的$2\to8$过程与6个外部强相互作用的部分子。不使用近似值,并考虑所有壳外效应和干扰效应。截面和微分分布从完整的计算进行比较,通过使用双极近似的顶夸克得到的结果。计算结果与双极点近似计算结果的差别一般在5%以下,但在某些相空间区域可达10%。

英文摘要:

In this article, we report on the computation of the NLO QCD corrections to ${\rm p}{\rm p} \to μ^-\barν_μ{\rm e}^+ν_{\rm e}\bar{\rm b}{\rm b}\bar{\rm b}{\rm b}$ at the LHC, which is an irreducible background to ${\rm p}{\rm p}\to{\rm t}\bar{\rm t}{\rm H}\bigl(\to{\rm b}\bar{\rm b}\bigr)$. This is the first time that a full NLO computation for a $2\to8$ process with 6 external strongly-interacting partons is made public. No approximations are used, and all off-shell and interference effects are taken into account. Cross sections and differential distributions from the full computation are compared to results obtained by using a double-pole approximation for the top quarks. The difference between the full calculation and the one using the double-pole approximation is in general below 5\% but can reach 10\% in some regions of phase space.

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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