B→πlν semileptonic form factor from three-flavor lattice QCD: A model-independent determination of |Vub|

Jon A. Bailey, C. Bernard, C. Detar, M. Di Pierro, A. X. El-Khadra, R. T. Evans, E. D. Freeland, E. Gamiz, Steven Gottlieb, U. M. Heller, J. E. Hetrick, A. S. Kronfeld, J. Laiho, L. Levkova, P. B. MacKenzie, M. Okamoto, J. N. Simone, R. Sugar, D. Toussaint, R. S. Van De Water

Research output: Contribution to journalArticle

136 Scopus citations

Abstract

We calculate the form factor f+(q2) 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+(q2) simultaneously with that measured by the BABAR experiment using a parameterization of the form-factor shape in q2, which relies only on analyticity and unitarity in order to determine the Cabibbo-Kobayashi-Maskawa matrix element |Vub|. This approach reduces the total uncertainty in |Vub| by combining the lattice and experimental information in an optimal, model-independent manner. We find a value of |Vub|×103=3.38±0.36.

Original languageEnglish (US)
Article number054507
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume79
Issue number5
DOIs
StatePublished - Mar 2 2009

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'B→πlν semileptonic form factor from three-flavor lattice QCD: A model-independent determination of |Vub|'. Together they form a unique fingerprint.

  • Cite this

    Bailey, J. A., Bernard, C., Detar, C., Di Pierro, M., El-Khadra, A. X., Evans, R. T., Freeland, E. D., Gamiz, E., Gottlieb, S., Heller, U. M., Hetrick, J. E., Kronfeld, A. S., Laiho, J., Levkova, L., MacKenzie, P. B., Okamoto, M., Simone, J. N., Sugar, R., Toussaint, D., & Van De Water, R. S. (2009). B→πlν semileptonic form factor from three-flavor lattice QCD: A model-independent determination of |Vub|. Physical Review D - Particles, Fields, Gravitation and Cosmology, 79(5), [054507]. https://doi.org/10.1103/PhysRevD.79.054507