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Article Dans Une Revue Physics Letters B Année : 2016

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

Résumé

The 5g−4f5g−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 ± 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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Dates et versions

hal-01314041 , version 1 (10-05-2016)
hal-01314041 , version 2 (04-01-2017)

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Martino Trassinelli, D. F. Anagnostopoulos, G. Borchert, A. Dax, J.P. Egger, et al.. Measurement of the charged pion mass using X-ray spectroscopy of exotic atoms. Physics Letters B, 2016, 759, pp.583-588. ⟨10.1016/j.physletb.2016.06.025⟩. ⟨hal-01314041v2⟩
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