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

doi:10.1103/PhysRevD.79.054507

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

Physics

Research output: Contribution to journal › Article › peer-review

161 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 language	English (US)
Article number	054507
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	79
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.79.054507
State	Published - Mar 2 2009

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.79.054507

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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), Article 054507. https://doi.org/10.1103/PhysRevD.79.054507

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, D & 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

@article{37b5af9f336c481fb94739693dc8d99a,

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

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.",

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

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month = mar,

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doi = "10.1103/PhysRevD.79.054507",

language = "English (US)",

volume = "79",

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T1 - B→πlν semileptonic form factor from three-flavor lattice QCD

T2 - A model-independent determination of |Vub|

AU - Bailey, Jon A.

AU - Bernard, C.

AU - Detar, C.

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.

AU - Hetrick, J. E.

AU - Kronfeld, A. S.

AU - Laiho, J.

AU - Levkova, L.

AU - MacKenzie, P. B.

AU - Okamoto, M.

AU - Simone, J. N.

AU - Sugar, R.

AU - Toussaint, D.

AU - Van De Water, R. S.

PY - 2009/3/2

Y1 - 2009/3/2

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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UR - https://www.scopus.com/pages/publications/65249104897#tab=citedBy

U2 - 10.1103/PhysRevD.79.054507

DO - 10.1103/PhysRevD.79.054507

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JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

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IS - 5

M1 - 054507

ER -

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

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