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

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Publication Type Journal Article
School or College College of Science
Department Physics
Creator DeTar, Carleton
Other Author Bernard, C.; Di Pierro, M.; El-Khadra, A. X.; Evans, R. T.; Freeland, E. D.; Gamiz, E.; Gottlieb, Steven; 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.
Title B̄→D*ℓν̄ form factor at zero recoil from three-flavor lattice QCD: a model independent determination of [Vcb]
Date 2009-01
Description We present the first lattice QCD calculation of the form factor for B→ D* lv 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+ 0:9exp + 10theo) X 10-3.
Type Text
Publisher American Physical Society
Journal Title Physical Review D
Volume 79
Issue 1
DOI 10.1103/PhysRevD.79.014506
citatation_issn 1550-7998
Subject Staggered quarks
Subject LCSH Form factor (Nuclear physics); Quantum chromodynamics; Lattice gauge theories; Particles (Nuclear physics); Particles (Nuclear physics) -- Chirality; Quarks; Perturbation (Mathematics)
Language eng
Bibliographic Citation 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, 79(1), 014506.
Rights Management (c) American Physical Society http://dx.doi.org/10.1103/PhysRevD.79.014506
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