B{yields}{pi}l{nu} semileptonic form factor from three-flavor lattice QCD: A model-independent determination of |V{sub ub}|

Journal Article · Sun Mar 01 04:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.054507· OSTI ID:21260095

Bailey, Jon A; Kronfeld, A S; Mackenzie, P B; Okamoto, M; Simone, J N; Water, R S. van de ^[1]; Bernard, C; Laiho, J ^[2]; DeTar, C; Levkova, L ^[3]; Di Pierro, M ^[4]; El-Khadra, A X; Evans, R T; Gamiz, E ^[5]; Freeland, E D ^[6]; Gottlieb, Steven ^[7]; Heller, U M ^[8]; Hetrick, J E ^[9]; Sugar, R ^[10]; Toussaint, D ^[11]

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1. Fermi National Accelerator Laboratory, Batavia, Illinois (United States)
2. Department of Physics, Washington University, St. Louis, Missouri (United States)
3. Physics Department, University of Utah, Salt Lake City, Utah (United States)
4. School of Computer Sci., Telecom. and Info. Systems, DePaul University, Chicago, Illinois (United States)
5. Physics Department, University of Illinois, Urbana, Illinois (United States)
6. Liberal Arts Department, School of the Art Institute of Chicago, Chicago, Illinois (United States)
7. Department of Physics, Indiana University, Bloomington, Indiana (United States)
8. American Physical Society, One Research Road, Ridge, New York (United States)
9. Physics Department, University of the Pacific, Stockton, California (United States)
10. Department of Physics, University of California, Santa Barbara, California (United States)
11. Department of Physics, University of Arizona, Tucson, Arizona (United States)

We calculate the form factor f{sub +}(q{sup 2}) for B-meson semileptonic decay in unquenched lattice QCD with 2+1 flavors of light sea quarks. We use Asqtad-improved staggered light quarks and a Fermilab bottom quark on gauge configurations generated by the MILC Collaboration. We simulate with several light-quark masses and at two lattice spacings, and extrapolate to the physical quark mass and continuum limit using heavy-light meson staggered chiral perturbation theory. We then fit the lattice result for f{sub +}(q{sup 2}) simultaneously with that measured by the BABAR experiment using a parameterization of the form-factor shape in q{sup 2}, which relies only on analyticity and unitarity in order to determine the Cabibbo-Kobayashi-Maskawa matrix element |V{sub ub}|. This approach reduces the total uncertainty in |V{sub ub}| by combining the lattice and experimental information in an optimal, model-independent manner. We find a value of |V{sub ub}|x10{sup 3}=3.38{+-}0.36.

• OSTI ID: 21260095
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B MESONS
B QUARKS
CHIRALITY
CONFIGURATION
D QUARKS
FERMILAB
FLAVOR MODEL
FORM FACTORS
KOBAYASHI-MASKAWA MATRIX
LATTICE FIELD THEORY
MASS
NEUTRINOS
PERTURBATION THEORY
PIONS
QUANTUM CHROMODYNAMICS
SEMILEPTONIC DECAY
SIMULATION
U QUARKS
UNITARITY