Decay constants fB and fBₛ from HISQ simulations
Lattice, Fermilab · Collaborations, MILC · : · Bazavov, A. · Bernard, C. · Bouchard, C. · Brown, N. · DeTar, C. · Du, D. · El-Khadra, A. X. · Freeland, E. D. · Gámiz, E. · Gottlieb, Steven · Heller, U. M. · Komijani, J. · Kronfeld, A. S. · Laiho, J. · Levkova, L. · Mackenzie, P. B. · Monahan, C. · Primer, T. · Na, Heechang · Neil, E. T. · Simone, J. N. · Sugar, R. L. · Toussaint, D. · Van de Water, R. S. · Zhou, R.
Original · EN
We give a progress report on a project aimed at a high-precision calculation of the decay constants fB and fBₛ from simulations with HISQ heavy and light valence and sea quarks. Calculations are carried out with several heavy valence-quark masses on ensembles with 2+1+1 flavors of HISQ sea quarks at five lattice spacings and several light sea-quark mass ratios mud/mₛ, including approximately physical sea-quark masses. This range of parameters provides excellent control of the continuum limit and of heavy-quark discretization errors. We present a preliminary error budget with projected uncertainties of 2.2 MeV and 1.5 MeV for fB and fBₛ, respectively.
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