Measurement of the charged pion mass using X-ray spectroscopy of exotic atoms
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...
Main Authors: | , , , , , , , , , , , , |
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Format: | Article |
Language: | English |
Published: |
Elsevier
2016-08-01
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Series: | Physics Letters B |
Subjects: | |
Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269316302787 |
Summary: | 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/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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ISSN: | 0370-2693 1873-2445 |