Yerevan Physics Institute, Yerevan, Armenia.
Institut für Hochenergiephysik der OeAW, Wien, Austria.
Phys Rev Lett. 2013 Nov 27;111(22):221801. doi: 10.1103/PhysRevLett.111.221801. Epub 2013 Nov 25.
A search for anomalous production of events with three or more isolated leptons and bottom-quark jets produced in pp collisions at √s=8 TeV is presented. The analysis is based on a data sample corresponding to an integrated luminosity of 19.5 fb(-1) collected by the CMS experiment at the LHC in 2012. No excess above the standard model expectations is observed. The results are interpreted in the context of supersymmetric models with signatures that have low missing transverse energy arising from light top-squark pair production with R-parity-violating decays of the lightest supersymmetric particle. In two models with different R-parity-violating couplings, top squarks are excluded below masses of 1020 GeV and 820 GeV when the lightest supersymmetric particle has a mass of 200 GeV.
本文对质心 CMS 实验在 LHC 上运行于 8 TeV 能量下采集的 19.5 fb(-1) 积分亮度数据，利用三或更多个孤立轻子和底夸克喷注事例的事例进行了搜索。研究结果基于 CMS 实验在 LHC 上运行于 8 TeV 能量下采集的 19.5 fb(-1)积分亮度数据，未观测到超出标准模型预期的事例。研究结果在具有轻 top 夸克对产生和最轻超对称粒子破坏 R 宇称的迹的超对称模型框架下进行了分析。在两个具有不同破坏 R 宇称耦合常数的模型中，当最轻超对称粒子质量为 200GeV 时，最轻的 top 夸克质量低于 1020GeV 和 820GeV。
