Physical Results from Unphysical Simulations

Details Physical Results from Unphysical Simulations Physical Results from Unphysical Simulations

2000-06-16

arxiv.org/abs/hep-lat/0006017v2

Phys.Rev. D62 (2000) 094503

Physics

High Energy Physics

High Energy Physics - Lattice

26 pages, 12 figures (discussion on discretization errors at end of sec. IV clarified; minor improvements in presentation; res

Scientific paper

10.1103/PhysRevD.62.094503

We calculate various properties of pseudoscalar mesons in partially quenched QCD using chiral perturbation theory through next-to-leading order. Our results can be used to extrapolate to QCD from partially quenched simulations, as long as the latter use three light dynamical quarks. In other words, one can use unphysical simulations to extract physical quantities - in this case the quark masses, meson decay constants, and the Gasser-Leutwyler parameters L_4-L_8. Our proposal for determining L_7 makes explicit use of an unphysical (yet measurable) effect of partially quenched theories, namely the double-pole that appears in certain two-point correlation functions. Most of our calculations are done for sea quarks having up to three different masses, except for our result for L_7, which is derived for degenerate sea quarks.

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