The Ds and D+ Leptonic Decay Constants from Lattice QCD

A. Bazavov, C. Bernard, C. DeTar, E. D. Freeland, E. Gamiz, Steven Gottlieb, U. M. Heller, J. E. Hetrick, A. X. El-Khadra, A. S. Kronfeld, John W Laiho, L. Levkova, P. B. Mackenzie, M. B. Oktay, M. Di Pierro, J. N. Simone, R. Sugar, D. Toussaint, R. S. Van De Water

Research output: Contribution to journalConference article

1 Scopus citations

Abstract

We present the leptonic decay constants fDs and fD+ computed on the MILC collaboration's 2+1 flavor asqtad gauge ensembles. We use clover heavy quarks with the Fermilab interpretation and improved staggered light quarks. The simultaneous chiral and continuum extrapolation, which determines both decay constants, includes partially-quenched lattice results at lattice spacings a 0:09, 0:12 and 0:15 fm. We have made several recent improvements in our analysis: a) we include terms in the fit describing leading order heavy-quark discretization effects, b) we have adopted a more precise input r1 value consistent with our other D and B meson studies, c) we have retuned the input bare charm masses based upon the new r1. Our preliminary results are fDs = 26010 MeV and fD+ = 21710 MeV.

Original languageEnglish (US)
JournalProceedings of Science
Volume91
StatePublished - Jan 1 2009
Externally publishedYes
Event27th International Symposium on Lattice Field Theory, LAT 2009 - Beijing, China
Duration: Jul 26 2009Jul 31 2009

ASJC Scopus subject areas

  • General

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    Bazavov, A., Bernard, C., DeTar, C., Freeland, E. D., Gamiz, E., Gottlieb, S., Heller, U. M., Hetrick, J. E., El-Khadra, A. X., Kronfeld, A. S., Laiho, J. W., Levkova, L., Mackenzie, P. B., Oktay, M. B., Di Pierro, M., Simone, J. N., Sugar, R., Toussaint, D., & Van De Water, R. S. (2009). The Ds and D+ Leptonic Decay Constants from Lattice QCD. Proceedings of Science, 91.