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@ARTICLE{Eicker:860341,
      author       = {Eicker, N. and Glässner, U. and Güsken, S. and Hoeber, H.
                      and Lippert, T. and Ritzenhöfer, G. and Schilling, K. and
                      Siegert, G. and Spitz, A. and Ueberholz, P. and Viehoff, J.},
      title        = {{E}valuating sea quark contributions to flavour-singlet
                      operators in lattice {QCD}},
      journal      = {Physics letters / B B},
      volume       = {389},
      number       = {4},
      issn         = {0370-2693},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ.},
      reportid     = {FZJ-2019-01116},
      pages        = {720 - 726},
      year         = {1996},
      abstract     = {In a full QCD lattice study with Nf = 2 Wilson fermions, we
                      seek to optimize the signals for the disconnected
                      contributions to the matrix element of flavour-singlet
                      operators between nucleon states, which are indicative for
                      sea quark effects. We demonstrate, in form of a fluctuation
                      analysis to the noisy estimator technique, that — in order
                      to achieve a tolerable signal to noise-ratio in full QCD —
                      it is advantageous to work with a Z2-noise source rather
                      than to rely only on gauge invariance to cancel
                      non-gauge-invariant background. In the case of the
                      πNσ-term, we find that 10 Z2-noise sources suffice on our
                      sample (about 150 independent QCD configurations at β = 5.6
                      on 163 × 32 withκsea = 0.157, equivalent to Mπ/Mϱ = 0.76
                      (1), to achieve decent signals and adequate fluctuations,
                      rather than 300 such sources as recently used in quenched
                      simulations.},
      ddc          = {530},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/S0370-2693(96)80015-3},
      url          = {https://juser.fz-juelich.de/record/860341},
}