利用光悬浮微球搜索毫荷电粒子
Search for Millicharged Particles Using Optically Levitated Microspheres
摘要:
我们报告的结果,从寻找稳定的粒子与电荷> $10^{-5}$ e散装物质在高真空中使用悬浮的电介质微球。在1.4 ng的总样本中未发现此类颗粒的证据,在95%置信水平下,供试材料的每个核子丰度上限为2.5 x $10^{-14}$。这些结果提供了第一个直接搜索的单个粒子与电荷< 0.1电子约束在宏观量的物质,并证明了在真空中使用光学悬浮微球进行灵敏的力测量的能力。
英文摘要:
We report results from a search for stable particles with charge > $10^{-5}$ e in bulk matter using levitated dielectric microspheres in high vacuum. No evidence for such particles was found in a total sample of 1.4 ng, providing an upper limit on the abundance per nucleon of 2.5 x $10^{-14}$ at the 95% confidence level for the material tested. These results provide the first direct search for single particles with charge < 0.1 e bound in macroscopic quantities of matter and demonstrate the ability to perform sensitive force measurements using optically levitated microspheres in vacuum.
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