Journal Article

FZJ-2021-01193

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Redetermination of the strong-interaction width in pionic hydrogen

Hirtl, A. ; Anagnostopoulos, D. F. ; Covita, D. S. ; Fuhrmann, H. ; Gorke, H.FZJ* ; Gotta, D. (Corresponding author)FZJ* ; Gruber, A.FZJ* ; Hennebach, M. ; Indelicato, P. ; Jensen, T. S. ; Bigot, E. -O. L. ; Liu, Y.-W. ; Markushin, V. E. ; Marton, J. ; Nekipelov, M. ; Santos, J. M. F. d. ; Simons, L. M. ; Strauch, T. ; Trassinelli, M. ; Veloso, J. F. C. A. ; Zmeskal, J.

2021
Springer Heidelberg

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Please use a persistent id in citations: http://hdl.handle.net/2128/27352  doi:10.1140/epja/s10050-021-00387-x

Abstract: The hadronic width of the ground state of pionic hydrogen has been redetermined by X-ray spectroscopy to be meV. The experiment was performed at the high-intensity low-energy pion beam of the Paul Scherrer Institute by using the cyclotron trap and a high-resolution Bragg spectrometer with spherically bent crystals. Coulomb de-excitation was studied in detail by comparing its influence on the line shape by measuring the three different transitions K, K, and K at various hydrogen densities. The pion-nucleon scattering lengths and other physical quantities extracted from pionic-atom data are in good agreement with the results obtained from pion-nucleon and nucleon-nucleon scattering experiments and confirm that a consistent picture is achieved for the low-energy pion-nucleon sector with respect to the expectations of chiral perturbation theory.

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Contributing Institute(s):

1. Experimentelle Hadrondynamik (IKP-2)

Research Program(s):

1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)

Appears in the scientific report 2021

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Database coverage:
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