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arXiv 1202.4847hep-ex
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在sqrt(s)= 7 TeV的pp碰撞中用基于消失径迹特征的ATLAS检测器寻找反常介导的超对称破缺

Search for anomaly-mediated supersymmetry breaking with the ATLAS detector based on a disappearing-track signature in pp collisions at sqrt(s) = 7 TeV

ATLAS Collaboration

摘要:

在反常介导的超对称破缺(AMSB)模型中,最轻的电荷子被预测具有足够长的寿命,可以在对撞机实验中被检测到。这封信探讨了AMSB方案在pp碰撞在sqrt(s)= 7 TeV的尝试,以确定衰变charginos的结果,在轨道,似乎有几个相关的命中在外部区域的跟踪系统。该搜索基于ATLAS探测器在2011年收集的积分亮度为1.02 fb^-1的数据。候选径迹的pT谱与标准模型背景过程的预期一致,并得到了对径迹寿命和生产截面的约束条件。在m_32 < 32 TeV,m_0 <1.5TeV,tan(beta)= 5和mu > 0的最小AMSB框架中,在95%的置信水平下排除了质量低于92 GeV、寿命在0.5 ~ 2ns之间的电荷子。

英文摘要:

In models of anomaly-mediated supersymmetry breaking (AMSB), the lightest chargino is predicted to have a lifetime long enough to be detected in collider experiments. This letter explores AMSB scenarios in pp collisions at sqrt(s) = 7 TeV by attempting to identify decaying charginos which result in tracks that appear to have few associated hits in the outer region of the tracking system. The search was based on data corresponding to an integrated luminosity of 1.02 fb^-1 collected with the ATLAS detector in 2011. The pT spectrum of candidate tracks is found to be consistent with the expectation from Standard Model background processes and constraints on the lifetime and the production cross section were obtained. In the minimal AMSB framework with m_3/2 < 32 TeV, m_0 < 1.5 TeV, tan(beta) = 5 and mu > 0, a chargino having mass below 92 GeV and a lifetime between 0.5 ns and 2 ns is excluded at 95% confidence level.

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