Search for Heavy Stable Charged Particles in CMS
Search for Heavy Stable Charged Particles in CMS
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DOI：
10.22323/1.130.0054
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
N. Neumeister
中科院分区：
文献类型：
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作者：
N. Neumeister
描述了在大型强子对撞机上对√S=7TeV的pp碰撞中产生的重稳定带电粒子的研究结果。数据样本是用CMS探测器收集的，对应的积分光度为1.09fB−1。内部跟踪器探测器的动量和电离能量损失测量用于识别与重的慢速运动粒子兼容的径迹。此外，通过Muon识别标准的径迹需要具有与缓慢移动的粒子一致的大飞行时间。在这两种情况下，最终数据样本与数据驱动技术估计的预期背景一致。这一结果是在具有(准)稳定胶子、标量顶夸克模型和标量tau的模型的背景下解释的。在95%C.L.下，稳定胶子(标量顶夸克)的质量下限被设定为899(620)GeV/c2。标量tau的质量下限设置为293GeV/c2。稳定胶子(标量顶夸克)在到达Muon探测器之前变为中性的限制也被设定为808(515)GeV/c2。
The result of a search at the LHC for heavy stable charged particles produced in pp collisions at √ s = 7 TeV is described. The data sample was collected with the CMS detector and corresponds to an integrated luminosity of 1.09 fb−1. Momentum and ionization-energy-loss measurements in the inner tracker detector are used to identify tracks compatible with heavy slow-moving particles. Additionally, tracks passing muon identification criteria are required to have a large time-of-flight consistent with a slow moving particle. In both cases, the final data samples are consistent with the expected background estimated by a data driven technique. This result is interpreted within the context of models with a (quasi-)stable gluino, scalar top-quark models, and scalar tau. Lower limits at 95% C.L. on the mass of stable gluinos (scalar topquarks) are set at 899 (620) GeV/c2. The lower mass limit for a scalar tau is set at 293 GeV/c2. A limit of 808 (515) GeV/c2 is also set for a stable gluino (scalar top-quark) that becomes neutral before reaching the muon detectors.