利用奇异原子X射线光谱学测量带电π介子质量
Measurement of the charged pion mass using X-ray spectroscopy of exotic atoms
AI总结：
本研究通过同时测量1.4巴氮氧混合气体中π介子氮与μ介子氧原子的5g-4f跃迁，以μ介子谱线校准能量，测得负π介子质量为(139.57077±0.00018)MeV/c²，比现有世界平均值高4.2ppm。
摘要：
我们在1.4巴的氮氧混合气体中，同时测量了π介子氮原子和μ介子氧原子的$5g-4f$跃迁。由于μ子质量已知精度很高，μ介子谱线可为π介子跃迁提供能量校准。我们得到负带电π介子的质量为(139.57077±0.00018)MeV/c²（±1.3ppm），比当前世界平均水平大4.2ppm。
英文摘要：
The $5g-4f$ transitions in pionic nitrogen and muonic oxygen were measured simultaneously by using a gaseous nitrogen-oxygen mixture at 1.4\,bar. Due to the precise knowledge of the muon mass the muonic line provides the energy calibration for the pionic transition. A value of (139.57077\,$\pm$\,0.00018)\,MeV/c$^{2}$ ($\pm$\,1.3ppm) is derived for the mass of the negatively charged pion, which is 4.2ppm larger than the present world average.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
