Decay constants fB and fBs from HISQ simulations

A. Bazavov, C. Bernard, C. Bouchard, N. Brown, C. Detar, D. Du, A. X. El-Khadra, E. D. Freeland, E. Gámiz, Steven Gottlieb, U. M. Heller, J. Komijani, A. S. Kronfeld, John W Laiho, L. Levkova, P. B. Mackenzie, C. Monahan, T. Primer, Heechang Na, E. T. NeilJ. N. Simone, R. L. Sugar, D. Toussaint, R. S. Van De Waterl, R. Zhou

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Abstract

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.,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.

Original languageEnglish (US)
Article number331
JournalUnknown Journal
Volume14-18-July-2015
StatePublished - 2015

ASJC Scopus subject areas

  • General

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    Bazavov, A., Bernard, C., Bouchard, C., Brown, N., Detar, C., Du, D., El-Khadra, A. X., Freeland, E. D., Gámiz, E., Gottlieb, S., Heller, U. M., Komijani, J., Kronfeld, A. S., Laiho, J. W., Levkova, L., Mackenzie, P. B., Monahan, C., Primer, T., Na, H., ... Zhou, R. (2015). Decay constants fB and fBs from HISQ simulations. Unknown Journal, 14-18-July-2015, [331].