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We present a progress report on our calculation of the decay constants $f_B$and $f_{B_s}$ from lattice-QCD simulations with highly-improved staggeredquarks. Simulations are carried out with several heavy valence-quark masses on$(2+1+1)$-flavor ensembles that include charm sea quarks. We include data atsix lattice spacings and several light sea-quark masses, including anapproximately physical-mass ensemble at all but the smallest lattice spacing,0.03 fm. This range of parameters provides excellent control of the continuumextrapolation to zero lattice spacing and of heavy-quark discretization errors.Finally, using the heavy-quark effective theory expansion we present a methodof extracting from the same correlation functions the charm- and bottom-quarkmasses as well as some low-energy constants appearing in the heavy-quarkexpansion.

Decay constants $f_B$ and $f_{B_s}$ and quark masses $m_b$ and $m_c$ from HISQ simulations