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arXiv 1707.03325hep-ex
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在$\sqrt{s} =$ 8 TeV pp碰撞中寻找顶夸克对和光子事件的自然超对称性

Search for natural supersymmetry in events with top quark pairs and photons in pp collisions at $\sqrt{s} =$ 8 TeV

CMS Collaboration

摘要:

结果是从自然规范介导的超对称性(SUSY)的搜索中的顶部夸克是最轻的夸克,次轻的超对称性粒子是一个双类中性伴子,最轻的超对称性粒子是引力子的情况下。顶夸克对的强产生可以产生顶夸克和中性伴子对的事件,每个类双中性伴子衰变为一个光子和一个引力子。搜索是使用CMS实验在$\sqrt{s} = $ 8 TeV积累的pp碰撞数据的样本进行的,对应于19.7 fb $^{-1}$的积分亮度。末态由轻子(电子或μ子)、喷流和一个或两个光子组成。横向动量的不平衡的事件进行了比较与预期的频谱从标准模型过程。没有多余的事件收益率超出预期的背景下观察,结果被解释的规范介导的超对称性打破,导致排除顶夸克质量低于650-730 GeV的一般模型的背景下。

英文摘要:

Results are presented from a search for natural gauge-mediated supersymmetry (SUSY) in a scenario in which the top squark is the lightest squark, the next-to-lightest SUSY particle is a bino-like neutralino, and the lightest SUSY particle is the gravitino. The strong production of top squark pairs can produce events with pairs of top quarks and neutralinos, with each bino-like neutralino decaying to a photon and a gravitino. The search is performed using a sample of pp collision data accumulated by the CMS experiment at $\sqrt{s} = $8 TeV, corresponding to an integrated luminosity of 19.7 fb$^{-1}$. The final state consists of a lepton (electron or muon), jets, and one or two photons. The imbalance in transverse momentum in the events is compared with the expected spectrum from standard model processes. No excess event yield is observed beyond the expected background, and the result is interpreted in the context of a general model of gauge-mediated SUSY breaking that leads to exclusion of top squark masses below 650-730 GeV.

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