B{yields}D*l{nu} form factor at zero recoil from three-flavor lattice QCD: A model independent determination of |V{sub cb}|
- Department of Physics, Washington University, St. Louis, Missouri (United States)
- Physics Department, University of Utah, Salt Lake City, Utah (United States)
- School of Computer Science, Telecommunications and Information Systems, DePaul University, Chicago, Illinois (United States)
- Physics Department, University of Illinois, Urbana, Illinois (United States)
- Liberal Arts Department, The School of the Art Institute of Chicago, Chicago, Illinois (United States)
- Department of Physics, Indiana University, Bloomington, Indiana (United States)
- American Physical Society, Ridge, New York (United States)
- Physics Department, University of the Pacific, Stockton, California (United States)
- Fermi National Accelerator Laboratory, Batavia, Illinois (United States)
- Department of Physics, University of California, Santa Barbara, California (United States)
- Department of Physics, University of Arizona, Tucson, Arizona (United States)
We present the first lattice QCD calculation of the form factor for B{yields}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{sub B{yields}}{sub 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{sub B{yields}}{sub D*}(1)|V{sub cb}| leads to |V{sub cb}|=(38.7{+-}0.9{sub exp}{+-}1.0{sub theo})x10{sup -3}.
- OSTI ID:
- 21254725
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 79, Issue 1; Other Information: DOI: 10.1103/PhysRevD.79.014506; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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