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

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Abstract

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/c2 (± 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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Trassinelli, M., Anagnostopoulos, D. F., Borchert, G., Dax, A., Egger, J. P., Gotta, D., … Wells, A. (2016). Measurement of the charged pion mass using X-ray spectroscopy of exotic atoms. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 759, 583–588. https://doi.org/10.1016/j.physletb.2016.06.025

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