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@ARTICLE{Guo:18581,
      author       = {Guo, F.-K. and Hanhart, C. and F. J. Llanes-Estrada, F. J.
                      and Meißner, U.-G.},
      title        = {{W}hen hadrons become unstable: a novel type of
                      non-analyticity in chiral extrapolations},
      journal      = {Physics letters / B},
      volume       = {703},
      issn         = {0370-2693},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ.},
      reportid     = {PreJuSER-18581},
      pages        = {510 - 515},
      year         = {2011},
      note         = {We thank Stephan Durr and Akaki Rusetsky for useful
                      discussions. This work was supported in part by grants
                      provided by the HGF to the virtual institute "Spin and
                      strong QCD" (VH-VI-231), the DFG (SFB/TR 16) and the EU I3HP
                      "Study of Strongly Interacting Matter" under the Seventh
                      Framework Program of the EU, FPA 2008-00592, 2007-29115-E,
                      FIS2008-01323 (Spain) and 227431, HadronPhysics2 (EU).
                      F.J.L.E. thanks the members of the Nuclear Theory Center at
                      Forschungszentrum Julich for their hospitality during this
                      work. U.G.M. also thanks the BMBF for support (Grant No.
                      06BN9006).},
      abstract     = {Hadron masses show a specific dependence on the quark
                      masses. Therefore, the variation of these masses can cause a
                      resonance in a hadronic scattering amplitude to become a
                      bound state. Consequently, the amplitude exhibits a
                      non-analytic behavior at this transition. Crossed
                      amplitudes, where the resonance can be exchanged in the
                      t-channel, can be shown to exhibit the same phenomenon by s
                      --> t analytic continuation. This entails possible kinks in
                      lattice quark-mass extrapolations needed to compute hadronic
                      observables. (C) 2011 Elsevier B.V. All rights reserved.},
      keywords     = {quark: mass (INSPIRE) / hadron: mass (INSPIRE) / hadron:
                      stability (INSPIRE) / scattering amplitude (INSPIRE) / bound
                      state (INSPIRE) / expansion: chiral (INSPIRE) / kink
                      (INSPIRE) / analytic properties (INSPIRE) / rho(770)
                      (INSPIRE) / numerical calculations (INSPIRE) / pi: form
                      factor (INSPIRE) / resonance (INSPIRE) / vacuum polarization
                      (INSPIRE)},
      cin          = {IKP-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IKP-3-20111104},
      pnm          = {Physik der Hadronen und Kerne},
      pid          = {G:(DE-Juel1)FUEK413},
      shelfmark    = {Physics, Multidisciplinary / 11.55.Bq / 12.38.Gc},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000295500400018},
      eprint       = {1105.3366},
      howpublished = {arXiv:1105.3366},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1105.3366;\%\%$},
      doi          = {10.1016/j.physletb.2011.08.022},
      url          = {https://juser.fz-juelich.de/record/18581},
}