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@ARTICLE{Gsken:860316,
      author       = {Güsken, S. and Ueberholz, P. and Viehoff, J. and Eicker,
                      N. and Lacock, P. and Lippert, T. and Schilling, K. and
                      Spitz, A. and Struckmann, T.},
      title        = {{P}ion-nucleon σ term with dynamical {W}ilson fermions},
      journal      = {Physical review / D},
      volume       = {59},
      number       = {5},
      issn         = {0556-2821},
      address      = {Melville, NY},
      publisher    = {Inst.812068},
      reportid     = {FZJ-2019-01091},
      pages        = {054504},
      year         = {1999},
      abstract     = {We calculate connected and disconnected contributions to
                      the flavor singlet scalar density amplitude of the nucleon
                      in a full QCD lattice simulation with nf=2 dynamical Wilson
                      fermions at β=5.6 on a 163×32 lattice. We find that both
                      contributions are of similar size at the light quark mass.
                      We arrive at the estimate σπN=18(5)MeV. Its smallness is
                      directly related to the apparent decrease of u, d quark
                      masses when unquenching QCD lattice simulations. The y
                      parameter can be estimated from a semi-quenched analysis, in
                      which there are no strange quarks in the sea, the result
                      being y=0.59(13).},
      ddc          = {530},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/PhysRevD.59.054504},
      url          = {https://juser.fz-juelich.de/record/860316},
}