Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-10-18
Phys.Rev. D66 (2002) 014503
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, 9 eps figures, RevTeX; PACS numbers: 12.38.Gc, 12.15.Hh, 13.20.He
Scientific paper
10.1103/PhysRevD.66.014503
We develop a new method in lattice QCD to calculate the form factor F(1) at zero recoil. This is the main theoretical ingredient needed to determine |V(cb)| from the exclusive decay anti-B --> D* lepton anti-neutrino. We introduce three ratios, in which most of statistical and systematic error cancels, making a precise calculation possible. We fit the heavy-quark mass dependence directly, and extract the 1/m_Q^2 and three of the four 1/m_Q^3 corrections in the heavy-quark expansion. In this paper we show how the method works 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 the uncertainties come, respectively, from statistics and fitting, matching lattice gauge theory to QCD, lattice spacing dependence, light quark mass effects, and the quenched approximation. We also discuss how to reduce these uncertainties and, thus, to obtain a model-independent determination of |V(cb)|.
Hashimoto Shoji
Kronfeld Andreas S.
Mackenzie Paul B.
Ryan Sinead M.
Simone James N.
No associations
LandOfFree
Lattice calculation of the zero-recoil form factor of anti-B --> D* lepton anti-neutrino: toward a model independent determination of |V(cb)| does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Lattice calculation of the zero-recoil form factor of anti-B --> D* lepton anti-neutrino: toward a model independent determination of |V(cb)|, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lattice calculation of the zero-recoil form factor of anti-B --> D* lepton anti-neutrino: toward a model independent determination of |V(cb)| will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-283693