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, J. Laiho, L. Levkova, P. B. Mackenzie, C. Monahan, T. Primer, Heechang Na, E. T. NeilJ. N. Simone, R. L. Sugar, William D Toussaint, R. S. Van De Waterl, R. Zhou

Research output: Contribution to journalArticle

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
JournalProceedings of Science
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., Levkova, L., Mackenzie, P. B., Monahan, C., Primer, T., Na, H., ... Zhou, R. (2015). Decay constants fB and fBs from HISQ simulations. Proceedings of Science, 14-18-July-2015, [331].