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@ARTICLE{Ceci:18583,
      author       = {Ceci, S. and Döring, M. and Hanhart, C. and Krewald, S.
                      and Meißner, U.-G. and Svarc, A.},
      title        = {{R}elevance of complex branch points for partial wave
                      analysis},
      journal      = {Physical review / C},
      volume       = {84},
      number       = {1},
      issn         = {0556-2813},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {PreJuSER-18583},
      pages        = {015205},
      year         = {2011},
      note         = {This work is supported by the DAAD (Deutscher Akademischer
                      Austauschdienst), Grant No. D/08/00215. It is also supported
                      by the DFG (Deutsche Forschungsgemeinschaft, Gz., Grants No.
                      DO 1302/1-2 and No. SFB/TR-16) and by the EU-Research
                      Infrastructure Integrating Activity "Study of Strongly
                      Interacting Matter" (HadronPhysics2, Grant No. 227431) under
                      the Seventh Framework Program of the EU.},
      abstract     = {A central issue in hadron spectroscopy is to deduce-and
                      interpret-resonance parameters, namely, pole positions and
                      residues, from experimental data, for those are the
                      quantities to be compared to lattice QCD or model
                      calculations. However, not every structure in the
                      observables derives from a resonance pole: the origin might
                      as well be branch points, either located on the real axis
                      (when a new channel composed of stable particles opens) or
                      in the complex plane (when at least one of the intermediate
                      particles is unstable). In this paper we demonstrate first
                      the existence of such branch points in the complex plane and
                      then show on the example of the pi N P-11 partial wave that
                      it is not possible to distinguish the structures induced by
                      the latter from a true pole signal based on elastic data
                      alone.},
      keywords     = {partial wave analysis (INSPIRE) / hadron spectroscopy
                      (INSPIRE) / resonance: pole (INSPIRE) / S-matrix (INSPIRE) /
                      analytic properties (INSPIRE) / threshold (INSPIRE) / pi
                      nucleon: scattering amplitude (INSPIRE) / rho(770): width
                      (INSPIRE) / numerical calculations (INSPIRE)},
      cin          = {IKP-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IKP-3-20111104},
      pnm          = {Physik der Hadronen und Kerne / HADRONPHYSICS2 - Study of
                      Strongly Interacting Matter (227431)},
      pid          = {G:(DE-Juel1)FUEK413 / G:(EU-Grant)227431},
      shelfmark    = {Physics, Nuclear / 14.20.Gk / 13.75.Gx / 11.80.Gw /
                      24.10.Eq},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000292767200006},
      eprint       = {1104.3490},
      howpublished = {arXiv:1104.3490},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1104.3490;\%\%$},
      doi          = {10.1103/PhysRevC.84.015205},
      url          = {https://juser.fz-juelich.de/record/18583},
}