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, William D Toussaint, R. S. Van De Water

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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

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form factors
quantum chromodynamics
quarks
mesons
parameterization
perturbation theory
spacing
continuums
decay
matrices
configurations

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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B→πlν semileptonic form factor from three-flavor lattice QCD : A model-independent determination of |Vub|. / Bailey, Jon A.; Bernard, C.; Detar, C.; Di Pierro, M.; El-Khadra, A. X.; Evans, R. T.; Freeland, E. D.; Gamiz, E.; Gottlieb, Steven; Heller, U. M.; Hetrick, J. E.; Kronfeld, A. S.; Laiho, J.; Levkova, L.; MacKenzie, P. B.; Okamoto, M.; Simone, J. N.; Sugar, R.; Toussaint, William D; Van De Water, R. S.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 79, No. 5, 054507, 02.03.2009.

Research output: Contribution to journalArticle

Bailey, JA, Bernard, C, Detar, C, Di Pierro, M, El-Khadra, AX, Evans, RT, Freeland, ED, Gamiz, E, Gottlieb, S, Heller, UM, Hetrick, JE, Kronfeld, AS, Laiho, J, Levkova, L, MacKenzie, PB, Okamoto, M, Simone, JN, Sugar, R, Toussaint, WD & Van De Water, RS 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, vol. 79, no. 5, 054507. https://doi.org/10.1103/PhysRevD.79.054507
Bailey, Jon A. ; Bernard, C. ; Detar, C. ; Di Pierro, M. ; El-Khadra, A. X. ; Evans, R. T. ; Freeland, E. D. ; Gamiz, E. ; Gottlieb, Steven ; Heller, U. M. ; Hetrick, J. E. ; Kronfeld, A. S. ; Laiho, J. ; Levkova, L. ; MacKenzie, P. B. ; Okamoto, M. ; Simone, J. N. ; Sugar, R. ; Toussaint, William D ; Van De Water, R. S. / B→πlν semileptonic form factor from three-flavor lattice QCD : A model-independent determination of |Vub|. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2009 ; Vol. 79, No. 5.
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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.",
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AU - Di Pierro, M.

AU - El-Khadra, A. X.

AU - Evans, R. T.

AU - Freeland, E. D.

AU - Gamiz, E.

AU - Gottlieb, Steven

AU - Heller, U. M.

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AU - Simone, J. N.

AU - Sugar, R.

AU - Toussaint, William D

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N2 - 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.

AB - 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.

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