Recent results on B mixing and decay constants from HPQCD

Details Recent results on B mixing and decay constants from HPQCD Recent results on B mixing and decay constants from HPQCD

2009-10-21

arxiv.org/abs/0910.4131v1

PoS LAT2009:251,2009

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 5 figures, contribution to the 27th International Symposium on Lattice Field Theory, Beijing, July 2009

Scientific paper

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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