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We calculate the B-parameters for operators arising in theories of newphysics beyond the standard model (BSM) using HYP-smeared improved staggeredfermions on the MILC asqtad lattices with N_f = 2+1 flavors. We use threedifferent lattice spacings (a ~ 0.045, 0.06 and 0.09 fm) at a fixed ratio oflight to strange quarks, m_l/m_s = 1/5, to obtain the continuum results.Operator matching is done using perturbative matching at one-loop order, andresults are run to 2 or 3 GeV using two-loop running in the MS-bar scheme. Forthe chiral and continuum extrapolations, we use SU(2) staggered chiralperturbation theory. We present preliminary results with only statisticalerrors.

Beyond the Standard Model corrections to $K^0-\bar{K}^0$ mixing