The B -> D* l nu form factor at zero recoil from three-flavor lattice QCD: A model independent determination of |V_cb|

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dc.creatorBernard, C.
dc.creatorDeTar, C.
dc.creatorDi Pierro, M.
dc.creatorEl-Khadra, A. X.
dc.creatorEvans, R. T.
dc.creatorFreeland, E. D.
dc.creatorGamiz, E.
dc.creatorGottlieb, Steven
dc.creatorHeller, U. M.
dc.creatorHetrick, J. E.
dc.creatorKronfeld, A. S.
dc.creatorLaiho, J.
dc.creatorLevkova, L.
dc.creatorMackenzie, P. B.
dc.creatorOkamoto, M.
dc.creatorSimone, J.
dc.creatorSugar, R.
dc.creatorToussaint, D.
dc.creatorVan de Water, R. S.
dc.date2008-08-19
dc.date2009-01-26
dc.date.accessioned2026-07-07T13:07:03Z
dc.date.available2026-07-07T13:07:03Z
dc.descriptionWe present the first lattice QCD calculation of the form factor for B-> D* l nu 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, F_{B-> 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 F_{B-> D*}(1)|V_cb| leads to |V_cb|=(38.7 +/- 0.9_exp +/- 1.0_theo) x 10^-3.
dc.description48 pages, 9 figures. Sections VI and VII D clarified, minor typos corrected and references added. Version published in PRD
dc.identifierhttps://arxiv.org/abs/0808.2519
dc.identifierhttp://arxiv.org/abs/0808.2519
dc.identifierPhys.Rev.D79:014506,2009
dc.identifierdoi:10.1103/PhysRevD.79.014506
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/227973
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Phenomenology
dc.titleThe B -> D* l nu form factor at zero recoil from three-flavor lattice QCD: A model independent determination of |V_cb|
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