TY  - JOUR
AU  - Hirtl, A.
AU  - Anagnostopoulos, D. F.
AU  - Covita, D. S.
AU  - Fuhrmann, H.
AU  - Gorke, H.
AU  - Gotta, D.
AU  - Gruber, A.
AU  - Hennebach, M.
AU  - Indelicato, P.
AU  - Jensen, Th. S.
AU  - Bigot, E.-O. Le
AU  - Liu, Y.-W.
AU  - Markushin, V. E.
AU  - Marton, J.
AU  - Nekipelov, M.
AU  - Santos, J. M. F. dos
AU  - Simons, L. M.
AU  - Strauch, Th.
AU  - Trassinelli, M.
AU  - Veloso, J. F. C. A.
AU  - Zmeskal, J.
TI  - Redetermination of the strong-interaction width in pionic hydrogen
JO  - The European physical journal / A
VL  - 57
IS  - 2
SN  - 1434-601X
CY  - Heidelberg
PB  - Springer
M1  - FZJ-2021-01193
SP  - 70
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000623308200001
DO  - DOI:10.1140/epja/s10050-021-00387-x
UR  - https://juser.fz-juelich.de/record/890777
ER  -