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The decay constants fB and fD from three-flavor lattice QCD

Presenter: James Simone — Fermilab

C. Bernard, C. DeTar, M. Di Pierro, A.X. El-Khadra, R.T. Evans, E. Freeland, E. Gamiz, S. Gottlieb, U.M. Heller, J.E. Hetrick, R. Jain, A.S. Kronfeld, J. Laiho, L. Levkova, P.B. Mackenzie, D. Renner, J. Simone, R. Sugar, D. Toussaint, R. Van de Water

We present new results for the leptonic decay constants fB+ and fD+ determined in 2+1 flavor lattice QCD at lattice spacings a=0.09, 0.12 and 0.15 fm. Results are obtained using the MILC collaboration improved staggered dynamical ensembles, clover heavy quarks in the Fermilab interpretation and improved staggered light valence quarks. Decay constants, computed at partially quenched combinations of the valence and sea light quark masses, are used to determine the low-energy parameters of staggered chiral perturbation theory. The physical decay constants are found in an extrapolation using the parameterized chiral formula.