CERN的CMS实验利用7 TeV和8 TeV质子-质子碰撞数据，对具有大于电子电荷且质量巨大的新粒子进行了搜索。研究结果显示数据符合标准模型预测，排除了多个质量范围内的特定电荷粒子，最髙达到8e电荷。
摘要：
Several models of new physics yield particles that are massive, long-lived, and have an electric charge, Q, greater than that of the electron, e. A search for evidence of such particles was performed using 5.0 fb-1 and 18.8 fb-1 of proton-proton collision data collected at s = 7 TeV and s = 8 TeV, respectively, with the Compact Muon Solenoid detector at the Large Hadron Collider. The distinctive detector signatures of these particles are that they are slow-moving and highly ionizing. Ionization energy loss and time-of-flight measurements were made using the inner tracker and the muon system, respectively. The search is sensitive to 1e ≤ |Q| ≤ 8e. Data were found to be consistent with standard model expectations and upper limits on the production cross section of these particles were computed using a Drell-Yan-like production model. Masses below 517, 687, 752, 791, 798, 778, 753, and 724 GeV are excluded for |Q|=1e, 2e, 3 e, 4e, 5e, 6e, 7e, and 8e, respectively.
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