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@ARTICLE{Hirtl:890777,
author = {Hirtl, A. and Anagnostopoulos, D. F. and Covita, D. S. and
Fuhrmann, H. and Gorke, H. and Gotta, D. and Gruber, A. and
Hennebach, M. and Indelicato, P. and Jensen, Th. S. and
Bigot, E.-O. Le and Liu, Y.-W. and Markushin, V. E. and
Marton, J. and Nekipelov, M. and Santos, J. M. F. dos and
Simons, L. M. and Strauch, Th. and Trassinelli, M. and
Veloso, J. F. C. A. and Zmeskal, J.},
title = {{R}edetermination of the strong-interaction width in pionic
hydrogen},
journal = {The European physical journal / A},
volume = {57},
number = {2},
issn = {1434-601X},
address = {Heidelberg},
publisher = {Springer},
reportid = {FZJ-2021-01193},
pages = {70},
year = {2021},
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.},
cin = {IKP-2},
ddc = {530},
cid = {I:(DE-Juel1)IKP-2-20111104},
pnm = {612 - Cosmic Matter in the Laboratory (POF4-612)},
pid = {G:(DE-HGF)POF4-612},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000623308200001},
doi = {10.1140/epja/s10050-021-00387-x},
url = {https://juser.fz-juelich.de/record/890777},
}