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Neutral B meson mixing matrix elements and B meson decay constants arecalculated. Static approximation is used for b quark and domain-wall fermionformalism is employed for light quarks. The calculations are done on 2+1 flavordynamical ensembles, whose lattice spacings are 0.086 fm and 0.11 fm with afixed physical spatial volume of about (2.7 fm)^3. In the static quark action,link-smearings are used to improve the signal-to-noise ratio. We employ twokinds of link-smearings and their results are combined in taking a continuumlimit. For the matching between the lattice and the continuum theory, one-loopperturbative calculations are used including O(a) improvements to reducediscretization errors. We obtain SU(3) braking ratio \xi=1.222(60) in thestatic limit of b quark.

Neutral B meson mixing with static heavy and domain-wall light quarks