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Title: Measurement of the charged pion mass using X-ray spectroscopy of exotic atoms
Authors: Trassinelli, M.
Anagnostopoulos, D. F.
Borchert, G.
Dax, A.
Egger, J.-P.
Gotta, D.
Hennebach, M.
Indelicato, P.
Liu, Y.-W.
Manil, B.
Nelms, Nicholas H.
Simons, L. M.
Wells, A.
First Published: 15-Jun-2016
Publisher: Elsevier: SCOAP3
Citation: Physics Letters B, 2016, 759, pp. 583-588
Abstract: 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.
DOI Link: 10.1016/j.physletb.2016.06.025
ISSN: 0370-2693
eISSN: 1873-2445
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © the authors, 2016. This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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