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Recent results on B mixing and decay constants from HPQCD · Around

2009

Recent results on B mixing and decay constants from HPQCD

Shigemitsu, J., Davies, C. T. H., Follana, E. et al.

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We review recent results for B_d and B_s mixing parameters using MILC N_f=2+1 lattices, NRQCD b-quarks and AsqTad light quarks.

Latest numbers for decay constants f_B and f_{B_s} are also presented.
Combining our lattice results with experimental determinations of the mass differences \Delta M_d and \Delta M_s leads to an important ratio of elements of the CKM matrix, |V_{td}|/|V_{ts}| = 0.214(1)(5) and an updated Standard Model number for the branching fraction Br(B_s -> mu^+ mu^-) = 3.19(19) x 10^{-9}.
Preliminary new results for f_{B_s} based on other actions are also described.

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We thank C.Bernard, J.Laiho and R.van de Water for communicating their results to us prior to publication
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