Neutral kaon mixing from 2+1 flavor Domain Wall QCD
Abstract
We present the first results for neutral kaon mixing using 2+1 flavors of domain wall fermions. A new approach is used to extrapolate to the physical up and down quark masses from our numerical studies with pion masses in the range 240 -- 420 MeV; only SU(2)L × SU(2)R chiral symmetry is assumed and the kaon is not assumed to be light. Our main result is BK MS(2 GeV) = 0.524(10)(28) where the first error is statistical and the second incorporates estimates for all systematic errors.
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