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

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

2008-04-09

arxiv.org/abs/0804.1501v2

JHEP0808:086,2008

Physics

High Energy Physics

High Energy Physics - Lattice

26 pages, 7 figures. Version accepted by JHEP

Scientific paper

10.1088/1126-6708/2008/08/086

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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