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We give a progress report on the calculation of B meson mixing matrixelements, focusing on contributions that could arise beyond the Standard Model.The calculation uses asqtad (light quark) and Fermilab (heavy quark) valenceactions and MILC ensembles with 2+1 flavors of asqtad sea quarks. We reportpreliminary B^0_s fit results, at a lattice spacing of 0.12 fm, for the SUSYbasis of effective four-quark mixing operators and include an estimate for thefinal error budget.

B^0_s and B^0 Mixing in the Standard Model and Beyond: A Progress Report