B̄→D*ℓν̄ form factor at zero recoil from three-flavor lattice QCD: A model independent determination of |Vcb|

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

Research output: Contribution to journalArticle

80 Scopus citations

Abstract

We present the first lattice QCD calculation of the form factor for B̄→D*ℓν̄ with three flavors of sea quarks. We use an improved staggered action for the light valence and sea quarks (the MILC configurations), and the Fermilab action for the heavy quarks. The form factor is computed at zero recoil using a new double ratio method that yields the form factor more directly than the previous Fermilab method. Other improvements over the previous calculation include the use of much lighter light-quark masses, and the use of lattice (staggered) chiral perturbation theory in order to control the light-quark discretization errors and chiral extrapolation. We obtain for the form factor, FB→D*(1)=0.921(13)(20), where the first error is statistical and the second is the sum of all systematic errors in quadrature. Applying a 0.7% electromagnetic correction and taking the latest PDG average for FB→D*(1)|Vcb| leads to |Vcb|=(38.7±0.9 ±1.0theo) ×10-3.

Original languageEnglish (US)
Article number014506
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume79
Issue number1
DOIs
StatePublished - Jan 5 2009

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Bernard, C., DeTar, C., Di Pierro, M., El-Khadra, A. X., Evans, R. T., Freeland, E. D., Gamiz, E., Gottlieb, S., Heller, U. M., Hetrick, J. E., Kronfeld, A. S., Laiho, J., Levkova, L., MacKenzie, P. B., Okamoto, M., Simone, J., Sugar, R., Toussaint, D., & Van De Water, R. S. (2009). B̄→D*ℓν̄ form factor at zero recoil from three-flavor lattice QCD: A model independent determination of |Vcb|. Physical Review D - Particles, Fields, Gravitation and Cosmology, 79(1), [014506]. https://doi.org/10.1103/PhysRevD.79.014506