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arXiv 1606.09150hep-ex
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用LHC探测器研究$\sqrt{s}$ = 13 TeV $pp$碰撞中含双光子和丢失横动量末态的超对称性

Search for supersymmetry in a final state containing two photons and missing transverse momentum in $\sqrt{s}$ = 13 TeV $pp$ collisions at the LHC using the ATLAS detector

ATLAS Collaboration

摘要:

利用大型强子对撞机上的ATLAS探测器,在含有两个光子和缺少横动量的末态中寻找超对称性。该搜索利用了2015年在13 TeV的质心能量下收集的3.2 fb $^{-1}$质子-质子碰撞数据。使用数据驱动和基于蒙特卡罗的方法的组合,标准模型背景被估计为$0.27^{+0.22}_{-0.10}$事件。在信号区没有观察到事件;考虑到预期的背景及其不确定性,由于物理学超出标准模型,该观察结果意味着可见截面上的模型无关95% CL上限为0.93 fb(3.0个事件)。在规范介导的超对称破缺的广义模型中,一个类双星次轻超对称粒子的质量下限为1650 GeV,而与较轻的类双星中性伴子的质量无关。

英文摘要:

A search has been made for supersymmetry in a final state containing two photons and missing transverse momentum using the ATLAS detector at the Large Hadron Collider. The search makes use of 3.2 fb$^{-1}$ of proton-proton collision data collected at a centre-of-mass energy of 13 TeV in 2015. Using a combination of data-driven and Monte-Carlo-based approaches, the Standard Model background is estimated to be $0.27^{+0.22}_{-0.10}$ events. No events are observed in the signal region; considering the expected background and its uncertainty, this observation implies a model-independent 95% CL upper limit of 0.93 fb (3.0 events) on the visible cross section due to physics beyond the Standard Model. In the context of a generalized model of gauge-mediated supersymmetry breaking with a bino-like next-to-lightest supersymmetric particle, this leads to a lower limit of 1650 GeV on the mass of a degenerate octet of gluino states, independent of the mass of the lighter bino-like neutralino.

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