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@ARTICLE{Afzal:889240,
      author       = {Afzal, F. and Wunderlich, Y. and Anisovich, A. V. and
                      Bayadilov, D. and Beck, R. and Becker, M. and Blanke, E. and
                      Brinkmann, K.-Th. and Ciupka, S. and Crede, V. and Dieterle,
                      M. and Dutz, H. and Elsner, D. and Friedrich, S. and
                      Frommberger, F. and Gridnev, A. and Gottschall, M. and
                      Grüner, M. and Gutz, E. and Hammann, C. and Hannappel, J.
                      and Hartmann, J. and Hillert, W. and Hoff, J. and
                      Hoffmeister, P. and Honisch, C. and Jude, T. and Kalinowsky,
                      H. and Kalischewski, F. and Keshelashvili, I. and Klassen,
                      P. and Klein, F. and Klempt, E. and Koop, K. and Kroenert,
                      P. and Krusche, B. and Lang, M. and Lopatin, I. and
                      Mahlberg, P. and Meißner, U.-G. and Messi, F. and Metag, V.
                      and Meyer, W. and Mitlasóczki, B. and Müller, J. and
                      Müllers, J. and Nanova, M. and Nikonov, K. and Nikonov, V.
                      and Novinskiy, V. and Novotny, R. and Piontek, D. and
                      Reicherz, G. and Richter, L. and Rönchen, Deborah and
                      Rostomyan, T. and Salisbury, B. and Sarantsev, A. and
                      Schaab, D. and Schmidt, C. and Schmieden, H. and Schultes,
                      J. and Seifen, T. and Sokhoyan, V. and Sowa, C. and Spieker,
                      K. and Stausberg, N. and Thiel, A. and Thoma, U. and
                      Triffterer, T. and Urban, M. and Urff, G. and van Pee, H.
                      and Walther, D. and Wendel, Ch. and Wiedner, U. and Wilson,
                      A. and Winnebeck, A. and Witthauer, L.},
      title        = {{O}bservation of the p η ′ {C}usp in the {N}ew {P}recise
                      {B}eam {A}symmetry Σ {D}ata for γ p → p η},
      journal      = {Physical review letters},
      volume       = {125},
      number       = {15},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2021-00145},
      pages        = {152002},
      year         = {2020},
      abstract     = {Data on the beam asymmetry Σ in the photoproduction of η
                      mesons off protons are reported for tagged photon energies
                      from 1130 to 1790 MeV (mass range from W=1748  MeV to
                      W=2045  MeV). The data cover the full solid angle that
                      allows for a precise moment analysis. For the first time, a
                      strong cusp effect in a polarization observable has been
                      observed that is an effect of a branch-point singularity at
                      the pη′ threshold [Eγ=1447  MeV (W=1896  MeV)].
                      The latest BnGa partial wave analysis includes the new beam
                      asymmetry data and yields a strong indication for the
                      N(1895)12− nucleon resonance, demonstrating the importance
                      of including all singularities for a correct determination
                      of partial waves and resonance parameters.},
      cin          = {IAS-4 / IKP-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / DFG project 196253076 - TRR 110: Symmetrien und
                      Strukturbildung in der Quantenchromodynamik (196253076)},
      pid          = {G:(DE-HGF)POF3-511 / G:(GEPRIS)196253076},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {33095637},
      UT           = {WOS:000576602100005},
      doi          = {10.1103/PhysRevLett.125.152002},
      url          = {https://juser.fz-juelich.de/record/889240},
}