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

Use of stochastic sources for the lattice determination of light quark physics
Use of stochastic sources for the lattice determination of light quark physics
In this paper we investigate the benefits of using Z(2) ⊗ Z(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 163 × 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 BK 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.
kaon physics, lattice QCD
1-24
Boyle, P.A.
deafc6c3-3d18-4199-84f5-6f20cd03e311
Kelly, C.
c4345b06-5900-4597-9dbc-623dc13e6f8e
Kenway, R.D.
1c60cf01-7151-491f-9ab4-18cebc6da3ea
Jüttner, A.
a90ff7c5-ae8f-4c8e-9679-b5a95b2a6247
Boyle, P.A.
deafc6c3-3d18-4199-84f5-6f20cd03e311
Kelly, C.
c4345b06-5900-4597-9dbc-623dc13e6f8e
Kenway, R.D.
1c60cf01-7151-491f-9ab4-18cebc6da3ea
Jüttner, A.
a90ff7c5-ae8f-4c8e-9679-b5a95b2a6247

Boyle, P.A., Kelly, C., Kenway, R.D. and Jüttner, A. (2008) Use of stochastic sources for the lattice determination of light quark physics. Journal of High Energy Physics, 2008 (08/086), 1-24. (doi:10.1088/1126-6708/2008/08/086).

Record type: Article

Abstract

In this paper we investigate the benefits of using Z(2) ⊗ Z(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 163 × 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 BK 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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Published date: 26 August 2008
Keywords: kaon physics, lattice QCD
Organisations: Theoretical Partical Physics Group

Identifiers

Local EPrints ID: 339210
URI: https://eprints.soton.ac.uk/id/eprint/339210
PURE UUID: ae02b55e-6cef-4134-acbe-ced77ae073fe

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Date deposited: 25 May 2012 08:49
Last modified: 30 Jul 2018 16:31

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Contributors

Author: P.A. Boyle
Author: C. Kelly
Author: R.D. Kenway
Author: A. Jüttner

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