  We calculate the B-parameters for operators arising in theories of new
physics beyond the standard model (BSM) using HYP-smeared improved staggered
fermions on the MILC asqtad lattices with N_f = 2+1 flavors. We use three
different lattice spacings (a ~ 0.045, 0.06 and 0.09 fm) at a fixed ratio of
light 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, and
results are run to 2 or 3 GeV using two-loop running in the MS-bar scheme. For
the chiral and continuum extrapolations, we use SU(2) staggered chiral
perturbation theory. We present preliminary results with only statistical
errors.
