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Sharpe, SWME Collaboration, Taegil Bae, Weonjong Lee, Yong-Chull Jang","submitted_at":"2011-10-12T06:32:39Z","abstract_excerpt":"We present recent progress in our calculation of $B_K$ with improved staggered fermions using chiral extrapolations based on SU(3) staggered chiral perturbation theory. We have accumulated significantly higher statistics on the coarse, fine, and ultrafine MILC asqtad lattices. This leads to a reduction in statistical error and an improved continuum extrapolation. Our updated result is $\\hat{B}_K = B_K(\\text{RGI}) = 0.737 \\pm 0.003(\\text{stat}) \\pm 0.046 (\\text{sys})$. 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