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26 April 2024 |
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Evaluating Sea Quark Contributions to Flavour-Singlet Operators in Lattice QCD | | SESAM-Collaboration: N. Eicker
; U. Glässner
; S. Güsken H. Hoeber
; Th. Lippert
; G. Ritzenhöfer
; K. Schilling
; G. Siegert A. Spitz
; P. Ueberholz
; J. Viehoff
; | | Date: |
8 Aug 1996 | | Journal: | Phys.Lett. B389 (1996) 720-726 | | Subject: | hep-lat | | Abstract: | In a full QCD lattice study with $N_f = 2$ 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 $Z_2$-noise source rather than to rely only on gauge invariance to cancel non-gauge-invariant background. In the case of the $pi$N $sigma$-term, we find that 10 $Z_2$-noise sources suffice on our sample ( about 150 independent QCD configurations at $eta = 5.6$ on $16^3 imes32$ with $kappa_{sea} = 0.157$, equivalent to $M_{pi}/M_{
ho} = 0.76(1)$), to achieve decent signals and adequate fluctuations, rather than 300 such sources as recently used in quenched simulations. | | Source: | arXiv, hep-lat/9608040 | | Services: | Forum | Review | PDF | Favorites | |
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