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arXiv 1507.08294hep-phhep-ex
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LHC暗物质探测:单$Z$通道的多变量分析

Searches for Dark Matter at the LHC: A Multivariate Analysis in the Mono-$Z$ Channel

Alexandre Alves, Kuver Sinha

摘要:

我们研究了暗物质(DM)的生产在单Z通道在13 TeV的大型强子对撞机无论是在有效场论的框架,以及在简化模型与矢量介质,使用多变量分析。对于具有标量、矢量和张量耦合的DM夸克有效算符,DM质量为100 GeV,对于3 ab $^{-1}$,假设总背景归一化的系统不确定性为5\%,DM相互作用标度$Λ$中的5 $σ$范围分别为2、1和3 TeV左右。对于疏轻子矢量介质的简化模型,介质质量的5 $σ$达到1.7 TeV,也假设积分亮度的5\%系统学和3 ab $^{-1}$。达到暗物质相互作用的规模与使用似然函数判别式的多变量分析获得的至少两倍高,从一个简单的切割和计数分析,一旦系统的背景归一化大于百分之几考虑。此外,由于这些系统的不确定性,范围对于退化更加稳定。

英文摘要:

We study dark matter (DM) production in the mono-Z channel at the 13 TeV LHC both in an effective field theory framework as well as in simplified models with vector mediators, using a multivariate analysis. For DM-quark effective operators with scalar, vector, and tensor couplings and DM mass of 100 GeV, the 5$σ$ reach in the DM interaction scale $Λ$ is around 2, 1, and 3 TeV, respectively, for 3 ab$^{-1}$ and assuming a 5\% systematic uncertainty on the total background normalization. For simplified models with leptophobic vector mediators, the 5$σ$ reach for the mass of the mediator is 1.7 TeV also assuming a 5\% systematics and 3 ab$^{-1}$ of integrated luminosity. The reach for the dark matter interaction scale obtained with the multivariate analysis using a likelihood function discriminant is at least twice as high as that obtained from a simple cut and count analysis, once systematics on the background normalization larger than a few percent are taken into account. Moreover, the reach is much more stable against degradation due these systematic uncertainties.

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