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

作者：Trassinelli M^*; Anagnostopoulos D F; Borchert G; Dax A; Egger J P; Gotta D; Hennebach M; Indelicato P; Liu Y W; Manil B; Nelms N; Simons L M; Wells A

来源：Physics Letters B, 2016, 759: 583-588.

DOI：10.1016/j.physletb.2016.06.025

• Charged pion mass
• Exotic atoms
• X-ray spectroscopy

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 +/- 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.

• 出版日期2016-8-10
• 单位清华大学