Journal Article

FZJ-2019-01116

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Evaluating sea quark contributions to flavour-singlet operators in lattice QCD

Eicker, N.FZJ* ; Glässner, U. ; Güsken, S. ; Hoeber, H. ; Lippert, T.FZJ* ; Ritzenhöfer, G. ; Schilling, K.Extern* ; Siegert, G. ; Spitz, A. ; Ueberholz, P. ; Viehoff, J.

1996
North-Holland Publ. Amsterdam

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Please use a persistent id in citations: doi:10.1016/S0370-2693(96)80015-3

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.

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