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We present an unquenched lattice calculation for the SU(3) flavor breakingratios of the heavy-light decay constants and the $\Delta B = 2$ matrixelements. The calculation was performed on $16^3 \times 32$ lattices with twodynamical flavors of domain-wall quarks and inverse lattice spacing $1/a =1.69(5)$ GeV. Heavy quarks were implemented using an improved latticeformulation of the static approximation. In the infinite heavy-quark mass limitwe obtain $f_{B_s}/f_{B_d} = 1.29(4)(6)$, $B_{B_s}/B_{B_d} = 1.06(6)(4)$, $\xi= 1.33(8)(8)$ where the first error is statistical and the second systematic.Comment: 23 pages, 8 figures, RevTeX4; mentioned existence of 1/m_b  corrections, minor changes improving readabilit

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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Lattice calculation of SU(3) flavor breaking ratios inB0−B¯0mixing