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@ARTICLE{Struckmann:860323,
      author       = {Struckmann, T. and Schilling, K. and Bali, G. and Eicker,
                      N. and Güsken, S. and Lippert, Th. and Neff, H. and Orth,
                      B. and Schroers, W. and Viehoff, J. and Ueberholz, P.},
      title        = {{F}lavor singlet pseudoscalar masses in {N} f = 2 {QCD}},
      journal      = {Physical review / D},
      volume       = {63},
      number       = {7},
      issn         = {0556-2821},
      address      = {Melville, NY},
      publisher    = {Inst.812068},
      reportid     = {FZJ-2019-01098},
      pages        = {074503},
      year         = {2001},
      abstract     = {We perform a lattice mass analysis in the flavor singlet
                      pseudoscalar channel on the SESAM and TχL full QCD vacuum
                      configurations, with 2 active flavors of dynamical Wilson
                      fermions at β=5.6. At our inverse lattice spacing,
                      a−1≈2.3 GeV, we retrieve by a chiral extrapolation to
                      the physical light quark masses the value
                      mη′=3.7+8−4mπ. A crude extrapolation from (Nf=3)
                      phenomenology would suggest mη′≈5.1mπ for Nf=2 QCD. We
                      verify that the mass gap between the singlet state η′ and
                      the π flavor triplet state is due to gauge configurations
                      with nontrivial topology.},
      ddc          = {530},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/PhysRevD.63.074503},
      url          = {https://juser.fz-juelich.de/record/860323},
}