Yerevan Physics Institute, Yerevan, Armenia.
Phys Rev Lett. 2013 Aug 23;111(8):081802. doi: 10.1103/PhysRevLett.111.081802.
An inclusive search is presented for new heavy particle pairs produced in √s=7 TeV proton-proton collisions at the LHC using 4.7±0.1 fb(-1) of integrated luminosity. The selected events are analyzed in the 2D razor space of M(R), an event-by-event indicator of the heavy particle mass scale, and R, a dimensionless variable related to the missing transverse energy. The third-generation sector is probed using the event heavy-flavor content. The search is sensitive to generic supersymmetry models with minimal assumptions about the superpartner decay chains. No excess is observed in the number of events beyond that predicted by the standard model. Exclusion limits are derived in the CMSSM framework as well as for simplified models. Within the CMSSM parameter space considered, gluino masses up to 800 GeV and squark masses up to 1.35 TeV are excluded at 95% confidence level depending on the model parameters. The direct production of pairs of top or bottom squarks is excluded for masses as high as 400 GeV.
利用 LHC 在 √s=7 TeV 质子-质子碰撞中采集的 4.7±0.1 fb(-1) 积分亮度数据，对新的重粒子对的产生进行了包容性搜索。在所选择的事件中，在 M(R) 的二维 razor 空间中进行了分析，M(R) 是重粒子质量尺度的一个逐事件指示符，R 是与横向能量缺失相关的无量纲变量。使用事件的重味内容探测第三代部分。该搜索对通用超对称模型具有敏感性，对超伴衰变链的假设最少。在标准模型预测的事件数量之外没有观察到过多的事件。在 CMSSM 框架内以及简化模型中推导出排除限制。在所考虑的 CMSSM 参数空间内，取决于模型参数，在 95%置信水平下，高达 800 GeV 的 gluino 质量和高达 1.35 TeV 的 squark 质量被排除在外。高达 400 GeV 的顶夸克或底夸克对的直接产生被排除在外。
