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Use of stochastic sources for the lattice determination of light quark physics

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arxiv 0804.1501 v2 pith:JYZ2U23X submitted 2008-04-09 hep-lat

P. A. Boyle , A. Juttner , C. Kelly , R. D. Kenway This is my paper · ORCID
classification hep-lat
keywords stochasticsourcescorrelatorsensemblelatticelightoffersphysics
verification ladder T0 review T1 audit T2 compute T3 formal

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In this paper we investigate the benefits of using Z(2)xZ(2) single timeslice stochastic sources for the calculation of light quark physics on the lattice. Meson 2-point correlators measured using sources stochastic in only spin and those stochastic in both spin and colour indices are compared to point source correlators on the unit gauge and on a 16^3 x 32 Domain Wall QCD ensemble. It is found that the use of stochastic sources gives a considerable improvement in statistics for the same computational cost. The neutral kaon mixing matrix element B_K is also calculated on this ensemble with stochastic sources, but we conclude that the stochastic method offers no significant advantage over the traditional gauge-fixed wall source approach which already offers an exact volume average. We also discuss the application to semileptonic form factors in conjunction with partially twisted boundary conditions.

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Cited by 5 Pith papers

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