11 research outputs found
Heavy-Quark Masses from the Fermilab Method in Three-Flavor Lattice QCD
We report on heavy quark mass calculations using Fermilab heavy quarks. Lattice calculations of heavy-strange meson masses are combined with one-loop (automated) lattice perturbation theory to arrive at the quark mass. Mesons are constructed from Fermilab heavy quarks and staggered light quarks. We use the MILC ensembles at three lattice spacings and sea quark mass ratios of to 0.4. Preliminary results for the bottom quark are given in the potential subtracted scheme
form factors with 2+1 flavors
Using the MILC 2+1 flavor asqtad quark action ensembles, we are calculating
the form factors and for the semileptonic decay. A total of six ensembles with lattice spacing from
to 0.06 fm are being used. At the coarsest and finest lattice
spacings, the light quark mass is one-tenth the strange quark mass
. At the intermediate lattice spacing, the ratio ranges from
0.05 to 0.2. The valence quark is treated using the Sheikholeslami-Wohlert
Wilson-clover action with the Fermilab interpretation. The other valence quarks
use the asqtad action. When combined with (future) measurements from the LHCb
and Belle II experiments, these calculations will provide an alternate
determination of the CKM matrix element .Comment: 8 pages, 6 figures, to appear in the Proceedings of Lattice 2017,
June 18-24, Granada, Spai
Erratum to: Semileptonic form factors for B → D ∗ ℓ ν at nonzero recoil from 2 + 1 -flavor lattice QCD
The D Leptonic Decay Constants from Lattice QCD f D s and f D + from Lattice QCD
We present the leptonic decay constants f D s and f D + computed on the MILC collaboration's 2 + 1 flavor asqtad gauge ensembles. We use clover heavy quarks with the Fermilab interpretation and improved staggered light quarks. The simultaneous chiral and continuum extrapolation, which determines both decay constants, includes partially-quenched lattice results at lattice spacings a ≈ 0.09, 0.12 and 0.15 fm. We have made several recent improvements in our analysis: a) we include terms in the fit describing leading order heavy-quark discretization effects, b) we have adopted a more precise input r 1 value consistent with our other D and B meson studies, c) we have retuned the input bare charm masses based upon the new r 1 . Our preliminary results are f D s = 260 ± 10 MeV and f D + = 217 ± 10 MeV