paper

B-meson mixing from full lattice QCD with physical u, d, s and c quarks

arXiv:1411.6989

Abstract

We present the first lattice QCD calculation of the $B_{s}$ and $B_{d}$ mixing parameters with physical light quark masses. We use MILC gluon field configurations that include $u$ , $d$ , $s$ and $c$ sea quarks at 3 values of the lattice spacing and with 3 values of the $u / d$ quark mass going down to the physical value. We use improved NRQCD for the valence $b$ quarks. Preliminary results show significant improvements over earlier values.

6 pages, 6 figures, Proceedings of Lattice2014