用μ素测试重力
Testing Gravity with Muonium
摘要：
最近提出了一种新的技术，用于产生前所未有亮度的μ子（$μ^+$）和μ素（$μ^+e^-$）束。结果之一是，使用高度稳定的马赫-曾德尔型干涉仪，在100天的运行时间内，以百分之几的精度测量μ原子的引力加速度$\bar{g}$似乎是可行的。μ介子的惯性质量主要由带正电的反物质μ介子的质量决定.对$\bar{g}$的测量将是对反物质、纯轻子系统和第二代粒子的引力相互作用的首次检验。
英文摘要：
Recently a new technique for the production of muon ($μ^+$) and muonium ($μ^+e^-$) beams of unprecedented brightness has been proposed. As one consequence and using a highly stable Mach-Zehnder type interferometer, a measurement of the gravitational acceleration $\bar{g}$ of muonium atoms at the few percent level of precision appears feasible within 100 days of running time. The inertial mass of muonium is dominated by the mass of the positively charged - antimatter - muon. The measurement of $\bar{g}$ would be the first test of the gravitational interaction of antimatter, of a purely leptonic system, and of particles of the second generation.
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