arXiv 1806.059412018-06-15hep-phhep-ex

LHC的$ZZ$生产：$2\ell2ν$和$4\ell$特征的NNLO预测

$ZZ$ production at the LHC: NNLO predictions for $2\ell2ν$ and $4\ell$ signatures

Stefan Kallweit, Marius Wiesemann

备注：: 14 pages, 6 figures, 2 tables
DOI：: 10.1016/j.physletb.2018.10.016

摘要：

我们考虑QCD辐射修正$ZZ$生产的所有实验相关的轻子过程。我们报告了一种新的计算的次-首阶（NNLO）修正的双玻色子签名与两个带电轻子和丢失的横向能量（$\ell\ell$ + $E_T^{\rm miss}$）。考虑所有相关的最终状态：$\ell\ellν_\ellν_\ell$、$\ell\ellν_{\ell'}ν_{\ell'}$和$\ellν_{\ell}\ell'ν_{\ell'}$。我们还研究了四个带电轻子的过程：$\ell\ell\ell\ell$和$\ell\ell\ell'\ell'$。对于第一次实现NNLO精度的过程混合两个双谐振双玻色子拓扑结构（$ZZ/W^+W^-\to\ell\ellν_\ellν_\ell$）。我们发现很好的协议与ATLAS数据在8 TeV。NNLO校正很大（5-20%或更多），并且在大多数情况下，$ZZ$和$W^+W^-$共振之间的干扰效应可以忽略不计。

英文摘要：

We consider QCD radiative corrections to $ZZ$ production for all experimentally relevant leptonic processes. We report on a novel computation of next-to-next-to-leading-order (NNLO) corrections to the diboson signature with two charged leptons and missing transverse energy ($\ell\ell$+$E_T^{\rm miss}$). All relevant final states are considered: $\ell\ellν_\ellν_\ell$, $\ell\ellν_{\ell'}ν_{\ell'}$ and $\ellν_{\ell}\ell'ν_{\ell'}$. We also study processes with four charged leptons: $\ell\ell\ell\ell$ and $\ell\ell\ell'\ell'$. For the first time NNLO accuracy is achieved for a process mixing two double-resonant diboson topologies ($ZZ/W^+W^-\to\ell\ellν_\ellν_\ell$). We find good agreement with ATLAS data at 8 TeV. NNLO corrections are large (5-20% and more), and interference effects between $ZZ$ and $W^+W^-$ resonances turn out to be negligible in most cases.

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