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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},
}