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

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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 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

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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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doi = "10.1103/PhysRevD.79.054507",

language = "English (US)",

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

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