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arXiv 1607.05979hep-ex
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在用ATLAS探测器记录的$\sqrt{s}=13$ TeV质子-质子碰撞中强子衰变τ轻子、喷流和丢失横动量事件中寻找方子和胶子

Search for squarks and gluinos in events with hadronically decaying tau leptons, jets and missing transverse momentum in proton-proton collisions at $\sqrt{s}=13$ TeV recorded with the ATLAS detector

ATLAS Collaboration

摘要:

2015年,在大型强子对撞机的ATLAS探测器记录的$\sqrt{s}=13$ TeV的质子-质子碰撞数据中,使用3.2 fb $^{-1}$对具有大的缺失横向动量、喷流和至少一个强子衰变τ轻子的事件进行了超对称性的搜索。两个排他性的最终状态被认为是,要么正好一个或至少两个τ轻子。在数据中未观察到超过标准模型预测的情况。结果解释的规范介导的超对称性破缺的背景下,和一个简化的模型,富含tau级联衰变的胶子对生产,大大提高了以前的限制。在考虑的GMSB模型中,在95%的置信水平下排除了低于92 TeV的超临界尺度($Λ$)值,对应于低于2000 GeV的胶子质量。对于$\tanβ$的大值,不包括高达107 TeV的$Λ$值和高达2300 GeV的胶子质量。在简化的模型中,胶子质量被排除在1570 GeV,中性伴子质量约为100 GeV。所有质量在800 GeV到1500 GeV之间的胶子都不包括质量在700 GeV以下的中性子,而质量在1400 GeV左右的胶子最不包括750 GeV。

英文摘要:

A search for supersymmetry in events with large missing transverse momentum, jets, and at least one hadronically decaying tau lepton has been performed using 3.2 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV recorded by the ATLAS detector at the Large Hadron Collider in 2015. Two exclusive final states are considered, with either exactly one or at least two tau leptons. No excess over the Standard Model prediction is observed in the data. Results are interpreted in the context of gauge-mediated supersymmetry breaking and a simplified model of gluino pair production with tau-rich cascade decays, substantially improving on previous limits. In the GMSB model considered, supersymmetry-breaking scale ($Λ$) values below 92 TeV are excluded at the 95% confidence level, corresponding to gluino masses below 2000 GeV. For large values of $\tanβ$, values of $Λ$ up to 107 TeV and gluino masses up to 2300 GeV are excluded. In the simplified model, gluino masses are excluded up to 1570 GeV for neutralino masses around 100 GeV. Neutralino masses up to 700 GeV are excluded for all gluino masses between 800 GeV and 1500 GeV, while the strongest exclusion of 750 GeV is achieved for gluino masses around 1400 GeV.

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