Neutral kaon mixing from 2+1 flavor Domain Wall QCD

We present results for neutral kaon mixing at a fixed lattice spacing $a^{-1}=1.62(4)$ GeV using 2+1 flavors of domain wall fermions on a $16^3\times 32$ volume and length 16 in the fifth dimension, using QCDOC computers. The main result of this paper is $B_K^{\bar{\rm MS}}(2 GeV) = 0.557(12)(16)$ for our fixed lattice spacing and volume and where the first error is statistical and the second systematic. We estimate that the physical $B_K^{\bar{\rm MS}}(2 GeV) = 0.557(12)(29)$.