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

Abstract

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.

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Cited by in corpus (10)

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• Mean shift cluster recognition method implementation in the nested sampling algorithm
• The Nested_fit data analysis program
• Probing new hadronic forces with heavy exotic atoms
• Measurement of the charged pion mass using a low-density target of light atoms
• Calibration of the momentum scale of a particle physics detector using the Armenteros-Podolanski plot