valence

Neutral B-meson mixing from three-flavor lattice QCD: Determination of the SU(3)-breaking ratio xi

We study SU(3)-breaking effects in the neutral B_d-bar B_d and B_s-bar B_s systems with unquenched N_f=2+1 lattice QCD. We calculate the relevant matrix elements on the MILC collaboration's gauge configurations with asqtad-improved staggered sea …