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We present a calculation of the hadronic matrix elements relevant to B 0 − ¯ B 0 mixing and a preliminary result for the SU(3) breaking ratio ξ = f B s B B s / f B d B B d = 1.205(52). The calculation is done on the MILC lattices with 2+1 flavors of Asqtad-improved sea quarks. We use the Asqtad action for the light valence quarks and the Fermilab action for the b quark. A determination of the B 0 s and B 0 d mixing matrix elements using 2+1 lattice QCD

A determination of the $B_s^0$ and $B_d^0$ mixing matrix elements using 2+1 lattice QCD