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

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.

arXiv comment6 pages, 6 figures, Proceedings of Lattice2014

References in corpus (8)

• Lattice QCD ensembles with four flavors of highly improved staggered quarks
• Neutral B Meson Mixing in Unquenched Lattice QCD
• B-meson decay constants from improved lattice NRQCD and physical u, d, s and c sea quarks
• Precision tests of the J/ψ from full lattice QCD: mass, leptonic width and radiative decay rate to η_c
• The Upsilon spectrum and the determination of the lattice spacing from lattice QCD including charm quarks in the sea
• Radiative corrections to the lattice gluon action for highly improved staggered quarks (HISQ) and the effect of such corrections on the static potential
• Radiative improvement of the lattice NRQCD action using the background field method with applications to quarkonium spectroscopy
• Matching lattice and continuum four-fermion operators with nonrelativistic QCD and highly improved staggered quarks

Cited by in corpus (5)

• On the ultimate precision of meson mixing observables
• $B^0-{\bar{B}}^0$ Mixing at Next-to-Leading Order
• Testing the Standard Model under the weight of heavy flavors
• Neutral B-meson mixing parameters in and beyond the SM with 2+1 flavor lattice QCD
• $B_{s(d)}-{\bar{B}}_{s(d)}$ Mixing and $B_s\to {\mu }^{+}{\mu }^{-}$ Decay in the NMSSM with the Flavour Expansion Theorem