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We develop a new method in lattice QCD to calculate the form factor F(1) atzero recoil. This is the main theoretical ingredient needed to determine|V(cb)| from the exclusive decay anti-B --> D* lepton anti-neutrino. Weintroduce three ratios, in which most of statistical and systematic errorcancels, making a precise calculation possible. We fit the heavy-quark massdependence directly, and extract the 1/m_Q^2 and three of the four 1/m_Q^3corrections in the heavy-quark expansion. In this paper we show how the methodworks in the quenched approximation, obtaining F(1) = 0.913(+0.024-0.017)(+/-0.016)(+0.003-0.014)(+0.000-0.016)(+0.006-0.014) where theuncertainties come, respectively, from statistics and fitting, matching latticegauge theory to QCD, lattice spacing dependence, light quark mass effects, andthe quenched approximation. We also discuss how to reduce these uncertaintiesand, thus, to obtain a model-independent determination of |V(cb)|.Comment: 31 pages, 9 eps figures, RevTeX; PACS numbers: 12.38.Gc, 12.15.Hh,  13.20.H

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Lattice calculation of the zero-recoil form factor of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mi>l</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><…

Lattice calculation of the zero-recoil form factor ofB¯→D*lν<…