AN EXPLORATORY STUDY OF B_K FROM N_F = 2 DYNAMICAL CLOVER-IMPROVED WILSON FERMIONS

摘要

We report calculations of B_K using two flavours of dynamical clover-improved Wilson lattice fermions and look for dependence on the dynamical quark mass at fixed lattice spacing. We see some evidence for dynamical quark effects. In particular B_K decreases as the sea quark masses are reduced towards the up/down quark mass. Our meson masses are quite heavy and a firm prediction of the B_K value is a task for future simulations.