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arXiv 1605.00554hep-ph
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NLO QCD和对LHC的$WWW$生产的电弱校正

NLO QCD and electroweak corrections to $WWW$ production at the LHC

Shen Yong-Bai, Zhang Ren-You, Ma Wen-Gan, Li Xiao-Zhou, Guo Lei

摘要:

本文采用改进的窄宽度近似,考虑自旋关联和有限宽度效应,计算了LHC上$WWW$产生的次领先阶(NLO)QCD $[{\cal O}(α_s α^3)]$和电弱(EW)$[{\cal O}(α^4)]$修正,并处理了$W$玻色子的轻子衰变.讨论了由真实喷注辐射进行的非线性光学QCD修正,它显著地提高了产生率,特别是在高能区。我们还提供了在QCD+EW NLO中PDMATHAMO产生的积分截面和最终产物的各种运动学分布。我们发现,微扰QCD描述的收敛性可以通过在事件选择中应用硬喷注否决来改善,但这种喷注否决将引入一个新的理论不确定性来源。$14~{\rm TeV}$ LHC上$W^+W^-W^+$产生的纯NLO QCD相对于积分截面的修正量约为包含$p^{\, {\rm cut}}_{T,\, {\rm jet}} = 50~{\rm GeV}$的喷流否决事例选择方案中的$30\%$的量级,而在包含事例选择方案中,真正的NLO EW相对于积分截面的修正量可达$15\%$左右。我们的数值结果表明,在精确的预测中,NLO QCD和NLO EW修正都应该考虑。

英文摘要:

In this paper we calculate the next-to-leading order (NLO) QCD $[{\cal O}(α_s α^3)]$ and electroweak (EW) $[{\cal O}(α^4)]$ corrections to the $WWW$ production at the LHC and deal with the subsequent leptonic decays from $W$ bosons by adopting an improved narrow-width approximation which takes into account the spin correlation and finite-width effects. The NLO QCD correction from the real jet radiation is discussed, which significantly enhances the production rate, particularly in the high-energy region. We also provide the integrated cross section for the $WWW$ production and various kinematic distributions of final products at the QCD+EW NLO. We find that the convergence of the perturbative QCD description can be improved by applying a hard jet veto in the event selection, but this jet veto would introduce a new source of theoretical uncertainty. The pure NLO QCD relative correction to the integrated cross section for the $W^+W^-W^+$ production at the $14~{\rm TeV}$ LHC is on the order of $30\%$ in the jet-veto event selection scheme with $p^{\, {\rm cut}}_{T,\, {\rm jet}} = 50~{\rm GeV}$, while the genuine NLO EW relative correction can reach about $15\%$ in the inclusive event selection scheme. Our numerical results show that both the NLO QCD and NLO EW corrections should be taken into consideration in precision predictions.

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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