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arXiv 2204.07652hep-phhep-ex
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在寻找看不见的希格斯衰变中对V+2喷流背景的精确预测

Precise predictions for V+2 jet backgrounds in searches for invisible Higgs decays

Jonas M. Lindert, Stefano Pozzorini, Marek Schönherr

摘要:

我们提出次领先阶QCD和电弱(EW)理论预测$V+2\,$喷流的产生,与$V=Z,W^{\pm}$,考虑QCD和EW生产模式和它们的干扰。我们专注于相空间区域,其中$V+2\,$喷流的产生主要由矢量玻色子融合,这些过程产生的不可约背景中不可见的希格斯玻色子玻色子衰变的搜索占主导地位。部分子水平的预测提供了详细的处方,其实施在实验分析的基础上重新加权的Monte Carlo样本。关键的想法是,利用$W+2\,$喷流产生的精确数据,结合理论驱动的外推到$Z+2\,$喷流过程,可以导致在百分之几的水平上确定不可约的背景。特别注意的是,由于未知的高阶QCD和EW效应和它们之间的相关性不同的$V+2\,$喷流过程,这是关键,以提高不可见的希格斯衰变的灵敏度的剩余理论的不确定性的估计。

英文摘要:

We present next-to-leading order QCD and electroweak (EW) theory predictions for $V+2\,$jet production, with $V=Z,W^{\pm}$, considering both the QCD and EW production modes and their interference. We focus on phase-space regions where $V+2\,$jet production is dominated by vector-boson fusion, and where these processes yield the dominant irreducible backgrounds in searches for invisible Higgs boson decays. Predictions at parton level are provided together with detailed prescriptions for their implementation in experimental analyses based on the reweighting of Monte Carlo samples. The key idea is that, exploiting accurate data for $W+2\,$jet production in combination with a theory-driven extrapolation to the $Z+2\,$jet process can lead to a determination of the irreducible background at the few-percent level. Particular attention is devoted to the estimate of the residual theoretical uncertainties due to unknown higher-order QCD and EW effects and their correlation between the different $V+2\,$jet processes, which is key to improve the sensitivity to invisible Higgs decays.

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