B_K with dynamical overlap fermions

Abstract

We report on a calculation of $B_K$ with two-flavor dynamical overlap fermions on a $16^3\times 32$ lattice at $a\sim 0.12$ fm. The results are compared with the PQChPT prediction of quark mass dependence. The systematic errors due to finite volume effects and fixing topology are discussed.

7 pages, 5 figures, talk presented at Lattice 2007 (Weak decays and matrix elements)