Kaon $B$-parameter from improved staggered fermions in $N_f=2+1$ QCD

Taegil Bae, Yong-Chull Jang, Chulwoo Jung +9

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 wit…