KAON B-PARAMETER FROM QUENCHED LATTICE QCD

We present results of a large-scale simulation for the kaon B paramete r B-K in quenched lattice QCD with the Kogut-Susskind quark action. Ca lculating B-K at 1% statistical accuracy for seven values of lattice s pacing in the range a approximate to 0.24-0.04 fm on lattices up to 56 (3) x 96, we verify the theoretically predicted quadratic a dependence . Strong indications are found that, with our level of accuracy, alpha (<(MS)over bar>)(1/a)(2) terms arising from our one-loop matching proc edure have to be included in the continuum extrapolation. We present B -K(NDR, 2 GeV) = 0.628(42) as our final value, where NDR indicates nai ve dimensional regularization.