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

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...

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Bibliographic Details
Main Authors: M. Trassinelli, D.F. Anagnostopoulos, G. Borchert, A. Dax, J.-P. Egger, D. Gotta, M. Hennebach, P. Indelicato, Y.-W. Liu, B. Manil, N. Nelms, L.M. Simons, A. Wells
Format: Article
Language:English
Published: Elsevier 2016-08-01
Series:Physics Letters B
Subjects:
Charged pion mass
Exotic atoms
X-ray spectroscopy
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269316302787
Description
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.
ISSN:0370-2693
1873-2445

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