Review of lattice results concerning low-energy particle physics.

It appears that B K may be slightly smaller in two-flavour QCD, but in view of the relatively large uncertainty of the N f = 2 result, the difference is hardly significant.

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It is important to stress that in the ε -expansion higher-order finite-volume corrections might be significant, and the physical box size (in fm) should still be large in order to keep these contributions under control.

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