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Measurement of the charged pion mass using X-ray spectroscopy of exotic atoms
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Measurement of the charged pion mass using X-ray spectroscopy of exotic atoms

M. Trassinelli, D.F. Anagnostopoulos, G. Borchert, A. Dax, J.-P. Egger, D. Gotta, M. Hennebach, P. Indelicato, Y.-W. Liu, Y.-W. Liu, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.759, 頁碼.583-588
08/2016
DOI: https://doi.org/10.1016/j.physletb.2016.06.025

摘要

Charged pion mass Exotic atoms X-ray spectroscopy Nuclear and High Energy Physics
The [Formula presented] 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 ± 0.00018) MeV/c 2 (± 1.3 ppm) is derived for the mass of the negatively charged pion, which is 4.2 ppm larger than the present world average.

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