Neutral kaon mixing from 2+1 flavor Domain Wall QCD

We present results for neutral kaon mixing calculated at a fixed lattice spacing of $a^{-1}=1.73(3)$ GeV using 2+1 flavors of domain wall fermions on $16^3\times 32$ and $24^3\times 64$ volumes with length 16 in the fifth dimension, using QCDOC computers. We find $B_K^{\bar{\rm MS}}(2 {GeV}) = 0.524(10)(21)(18)$. The first error is statistical, the second is an estimated $O(a^2)$ error present because of the single, relatively coarse lattice spacing used and the third represents other systematic errors.