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000860341 245__ $$aEvaluating sea quark contributions to flavour-singlet operators in lattice QCD
000860341 260__ $$aAmsterdam$$bNorth-Holland Publ.$$c1996
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000860341 520__ $$aIn a full QCD lattice study with Nf = 2 Wilson fermions, we seek to optimize the signals for the disconnected contributions to the matrix element of flavour-singlet operators between nucleon states, which are indicative for sea quark effects. We demonstrate, in form of a fluctuation analysis to the noisy estimator technique, that — in order to achieve a tolerable signal to noise-ratio in full QCD — it is advantageous to work with a Z2-noise source rather than to rely only on gauge invariance to cancel non-gauge-invariant background. In the case of the πNσ-term, we find that 10 Z2-noise sources suffice on our sample (about 150 independent QCD configurations at β = 5.6 on 163 × 32 withκsea = 0.157, equivalent to Mπ/Mϱ = 0.76 (1), to achieve decent signals and adequate fluctuations, rather than 300 such sources as recently used in quenched simulations.
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000860341 7001_ $$0P:(DE-HGF)0$$aHoeber, H.$$b3
000860341 7001_ $$0P:(DE-Juel1)132179$$aLippert, T.$$b4$$ufzj
000860341 7001_ $$0P:(DE-HGF)0$$aRitzenhöfer, G.$$b5
000860341 7001_ $$0P:(DE-HGF)0$$aSchilling, K.$$b6
000860341 7001_ $$0P:(DE-HGF)0$$aSiegert, G.$$b7
000860341 7001_ $$0P:(DE-HGF)0$$aSpitz, A.$$b8
000860341 7001_ $$0P:(DE-HGF)0$$aUeberholz, P.$$b9
000860341 7001_ $$0P:(DE-HGF)0$$aViehoff, J.$$b10
000860341 773__ $$0PERI:(DE-600)1466612-1$$a10.1016/S0370-2693(96)80015-3$$gVol. 389, no. 4, p. 720 - 726$$n4$$p720 - 726$$tPhysics letters / B B$$v389$$x0370-2693$$y1996
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