K^0--\bar{K}^0 mixing in full lattice QCD

There are at least two methods to calculate $B_K$ with staggered fermions: one is the two spin trace formalism and the other is the one spin trace formalism. We have performed numerical simulations on a $16^3 \times 40$ lattice in full QCD with $β= 5.7$ and a dynamical quark mass 0.01 in lattice units. We try various sources to select only the pseudo-Goldstone bosons and compare the various results.

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