Recent results on B mixing and decay constants from HPQCD
Abstract
We review recent results for Bd and Bs mixing parameters using MILC Nf=2+1 lattices, NRQCD b-quarks and AsqTad light quarks. Latest numbers for decay constants fB and fBs are also presented. Combining our lattice results with experimental determinations of the mass differences Md and Ms leads to an important ratio of elements of the CKM matrix, |Vtd|/|Vts| = 0.214(1)(5) and an updated Standard Model number for the branching fraction Br(Bs -> mu+ mu-) = 3.19(19) x 10-9. Preliminary new results for fBs based on other actions are also described.
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