Department of Physics, University of Florida, Gainesville, Florida 32611, USA.
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2015 Mar 20;114(11):111302. doi: 10.1103/PhysRevLett.114.111302. Epub 2015 Mar 18.
While the standard model of particle physics does not include free particles with fractional charge, experimental searches have not ruled out their existence. We report results from the Cryogenic Dark Matter Search (CDMS II) experiment that give the first direct-detection limits for cosmogenically produced relativistic particles with electric charge lower than e/6. A search for tracks in the six stacked detectors of each of two of the CDMS II towers finds no candidates, thereby excluding new parameter space for particles with electric charges between e/6 and e/200.
虽然粒子物理学的标准模型不包括具有分数电荷的自由粒子，但实验搜索尚未排除它们的存在。我们报告了低温暗物质搜索（CDMS II）实验的结果，该实验首次对宇宙成因的相对论性粒子进行了直接探测，这些粒子的电荷低于 e/6。在 CDMS II 两座塔楼中的两座塔楼的六个堆叠探测器中搜索轨迹，未发现候选者，从而排除了电荷在 e/6 和 e/200 之间的粒子的新参数空间。
