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arXiv 1206.6767hep-phhep-ex
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利用轻子签名约束压缩超对称性

Constraining compressed supersymmetry using leptonic signatures

Krzysztof Rolbiecki, Kazuki Sakurai

摘要:

我们研究了在LHC上的多轻子搜索对具有压缩质谱的超对称模型的影响。对于这类模型,由于需要大的有效质量和E_T的缺失,通常的搜索策略的可接受性显着降低。另一方面,轻子搜索对于丢失末态对象的E_T和p_T确实有低得多的阈值。因此,如果一个具有压缩质量谱的模型允许多轻子末态,那么可以使用多轻子搜索来导出约束。对于一类简化模型,我们用ATLAS多轻子搜索分析方法研究了\sqrt{s} =7 TeV总积分亮度为1-2/fb的含有2-4个电子或μ子的末态的排斥极限.我们还修改了这些分析施加额外的削减,使其敏感性压缩超对称模型增加。使用原始和修改后的分析,我们表明,排除限制可以与喷气机加上失踪的E_T搜索竞争,提供排除限制高达1 TeV的胶子质量。我们还分析了几类事件来自不同的中间态粒子的效率。这使我们能够评估排除限制在类似的类模型具有不同的横截面和分支比,而不需要一个蒙特卡罗模拟。

英文摘要:

We study the impact of the multi-lepton searches at the LHC on supersymmetric models with compressed mass spectra. For such models the acceptances of the usual search strategies are significantly reduced due to requirement of large effective mass and missing E_T. On the other hand, lepton searches do have much lower thresholds for missing E_T and p_T of the final state objects. Therefore, if a model with a compressed mass spectrum allows for multi-lepton final states, one could derive constraints using multi-lepton searches. For a class of simplified models we study the exclusion limits using ATLAS multi-lepton search analyses for the final states containing 2-4 electrons or muons with a total integrated luminosity of 1-2/fb at \sqrt{s}=7 TeV. We also modify those analyses by imposing additional cuts, so that their sensitivity to compressed supersymmetric models increase. Using the original and modified analyses, we show that the exclusion limits can be competitive with jet plus missing E_T searches, providing exclusion limits up to gluino masses of 1 TeV. We also analyse the efficiencies for several classes of events coming from different intermediate state particles. This allows us to assess exclusion limits in similar class of models with different cross sections and branching ratios without requiring a Monte Carlo simulation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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