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We report calculations of the parameter B_K appearing in the Delta S=2neutral kaon mixing matrix element, whose uncertainty limits the power ofunitarity triangle constraints for testing the standard model or looking fornew physics. We use two flavours of dynamical clover-improved Wilson latticefermions and look for dependence on the dynamical quark mass at fixed latticespacing. We see some evidence for dynamical quark effects and in particular B_Kdecreases as the sea quark masses are reduced towards the up/down quark mass.Comment: 17 pages, 4 figures, uses JHEP3.cls, added comments and reference

Sea quark effects in BKfrom Nf=2 clover-improved Wilson fermions

Sea quark effects in B_Kfrom N_f=2 clover-improved Wilson fermions