arXiv 1909.076522019-09-17hep-ex

用ATLAS探测器产生三个大质量矢量玻色子的证据

Evidence for the production of three massive vector bosons with the ATLAS detector

Markus Cristinziani

备注：: 7 pages, 2 figures, contribution to the proceedings of the Seventh Annual Conference on Large Hadron Collider Physics (LHCP2019). arXiv admin note: substantial text overlap with arXiv:1906.09170
发表信息：: PoS (LHCP2019) 016

摘要：

在质子$-$质子碰撞中寻找三个大质量矢量玻色子的产生，使用2015年$-$ 2017年在大型强子对撞机上使用ATLAS探测器记录的$\sqrt{s}$ = 13 TeV的数据进行，对应于$79.8$ fb $^{-1}$的积分光度。选择具有两个同号轻子$\ell$（电子或μ子）和至少两个重构喷流的事件来搜索$WWW \to \ell ν\ell νqq$。具有三个轻子且没有任何同味反号轻子对的事件用于搜索$WWW \to \ell ν\ellν\ell ν$，而具有三个轻子且至少一个同味反号轻子对和一个或多个重构喷流的事件用于搜索$WWZ \to \ell νqq \ell \ell$。最后，分析了四轻子事件，寻找$WWZ \to \ell ν\ell ν\ell \ell$和$WZZ \to qq \ell \ell \ell \ell$。三个大质量矢量玻色子联合产生的证据被观察到，其显著性为4.1个标准差，而预期值为3.1个标准差。

英文摘要：

The search for the production of three massive vector bosons in proton$-$proton collisions, performed using data at $\sqrt{s}$ = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider in the years 2015$-$2017, corresponding to an integrated luminosity of $79.8$ fb$^{-1}$, is presented. Events with two same-sign leptons $\ell$ (electrons or muons) and at least two reconstructed jets are selected to search for $WWW \to \ell ν\ell νqq$. Events with three leptons without any same-flavour opposite-sign lepton pairs are used to search for $WWW \to \ell ν\ellν\ell ν$, while events with three leptons and at least one same-flavour opposite-sign lepton pair and one or more reconstructed jets are used to search for $WWZ \to \ell νqq \ell \ell$. Finally, events with four leptons are analysed to search for $WWZ \to \ell ν\ell ν\ell \ell$ and $WZZ \to qq \ell \ell \ell \ell$. Evidence for the joint production of three massive vector bosons is observed with a significance of 4.1 standard deviations, where the expectation is 3.1 standard deviations.

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