Kaon $B$-parameter from improved staggered fermions in $N_f=2+1$ QCD
  We present a calculation of the kaon $B$-parameter, $B_K$, using lattice QCD. We use improved staggered valence and sea fermions, the latter generated by the MILC collaboration with $N_f=2+1$ light flavors. To control discretization errors, we use four different lattice spacings ranging down to $a\approx 0.045\;$fm. The chiral and continuum extrapolations are done using SU(2) staggered chiral perturbation theory. Our final result is $\hat{B}_K = 0.727 \pm 0.004 (\text{stat}) \pm 0.038 (\text{sys})$, where the dominant systematic error is from our use of truncated (one-loop) matching factors. 
Taegil Bae, Yong-Chull Jang, Chulwoo Jung, Hyung-Jin Kim, Jangho Kim,   Jongjeong Kim, Kwangwoo Kim, Sunghee Kim, Weonjong L...
hep-lat hep-ph