B s→D s/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ +μ -)

Jon A. Bailey; A. Bazavov; C. Bernard; C. M. Bouchard; C. Detar; Daping Du; A. X. El-Khadra; J. Foley; E. D. Freeland; E. Gámiz; Steven Gottlieb; U. M. Heller; Jongjeong Kim; A. S. Kronfeld; J. Laiho; L. Levkova; P. B. MacKenzie; Y. Meurice; E. Neil; M. B. Oktay; Si Wei Qiu; J. N. Simone; R. Sugar; D. Toussaint; R. S. Van De Water; Ran Zhou

doi:10.1103/PhysRevD.85.114502

B _s→D _s/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ ⁺μ ^-)

Jon A. Bailey, A. Bazavov, C. Bernard, C. M. Bouchard, C. Detar, Daping Du, A. X. El-Khadra, J. Foley, E. D. Freeland, E. Gámiz, Steven Gottlieb, U. M. Heller, Jongjeong Kim, A. S. Kronfeld, J. Laiho, L. Levkova, P. B. MacKenzie, Y. Meurice, E. Neil, M. B. OktaySi Wei Qiu, J. N. Simone, R. Sugar, D. Toussaint, R. S. Van De Water, Ran Zhou

Physics

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

66 Scopus citations

Abstract

We calculate form-factor ratios between the semileptonic decays B ^̄0→D ^+-ν̄ and B̄s0→Ds+ ^-ν̄ with lattice QCD. These ratios are a key theoretical input in a new strategy to determine the fragmentation fractions of neutral B decays, which are needed for measurements of BR(Bs0→μ ⁺μ ^-). We use the MILC ensembles of gauge configurations with 2+1 flavors of sea-quarks at two s of approximately 0.12 fm and 0.09 fm. We use the model-independent z parametrization to extrapolate our simulation results at small recoil toward maximum recoil. Our results for the form-factor ratios are f0(s)(Mπ2)/f0(d)(MK2)=1.046(44) _stat(15) _syst and f0(s)(Mπ2)/f0(d)(Mπ2)=1.054(47) _stat(17) _syst. In contrast to a QCD sum-rule calculation, no significant departure from U-spin (d↔s) symmetry is observed.

Original language	English (US)
Article number	114502
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	85
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevD.85.114502
State	Published - Jun 4 2012

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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Bailey, J. A., Bazavov, A., Bernard, C., Bouchard, C. M., Detar, C., Du, D., El-Khadra, A. X., Foley, J., Freeland, E. D., Gámiz, E., Gottlieb, S., Heller, U. M., Kim, J., Kronfeld, A. S., Laiho, J., Levkova, L., MacKenzie, P. B., Meurice, Y., Neil, E., ... Zhou, R. (2012). B _s→D _s/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ ⁺μ ^-). Physical Review D - Particles, Fields, Gravitation and Cosmology, 85(11), Article 114502. https://doi.org/10.1103/PhysRevD.85.114502

Bailey, JA, Bazavov, A, Bernard, C, Bouchard, CM, Detar, C, Du, D, El-Khadra, AX, Foley, J, Freeland, ED, Gámiz, E, Gottlieb, S, Heller, UM, Kim, J, Kronfeld, AS, Laiho, J, Levkova, L, MacKenzie, PB, Meurice, Y, Neil, E, Oktay, MB, Qiu, SW, Simone, JN, Sugar, R, Toussaint, D, Van De Water, RS & Zhou, R 2012, 'B _s→D _s/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ ⁺μ ^-)', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 85, no. 11, 114502. https://doi.org/10.1103/PhysRevD.85.114502

@article{69b3e5cfe7d84b2cb164da828c3ba689,

title = "B s→D s/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ +μ -)",

abstract = "We calculate form-factor ratios between the semileptonic decays B{\= }0→D +-{\=ν} and {\=B}s0→Ds+ -{\=ν} with lattice QCD. These ratios are a key theoretical input in a new strategy to determine the fragmentation fractions of neutral B decays, which are needed for measurements of BR(Bs0→μ +μ -). We use the MILC ensembles of gauge configurations with 2+1 flavors of sea-quarks at two s of approximately 0.12 fm and 0.09 fm. We use the model-independent z parametrization to extrapolate our simulation results at small recoil toward maximum recoil. Our results for the form-factor ratios are f0(s)(Mπ2)/f0(d)(MK2)=1.046(44) stat(15) syst and f0(s)(Mπ2)/f0(d)(Mπ2)=1.054(47) stat(17) syst. In contrast to a QCD sum-rule calculation, no significant departure from U-spin (d↔s) symmetry is observed.",

author = "Bailey, {Jon A.} and A. Bazavov and C. Bernard and Bouchard, {C. M.} and C. Detar and Daping Du and El-Khadra, {A. X.} and J. Foley and Freeland, {E. D.} and E. G{\'a}miz and Steven Gottlieb and Heller, {U. M.} and Jongjeong Kim and Kronfeld, {A. S.} and J. Laiho and L. Levkova and MacKenzie, {P. B.} and Y. Meurice and E. Neil and Oktay, {M. B.} and Qiu, {Si Wei} and Simone, {J. N.} and R. Sugar and D. Toussaint and {Van De Water}, {R. S.} and Ran Zhou",

year = "2012",

month = jun,

day = "4",

doi = "10.1103/PhysRevD.85.114502",

language = "English (US)",

volume = "85",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

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TY - JOUR

T1 - B s→D s/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ +μ -)

AU - Bailey, Jon A.

AU - Bazavov, A.

AU - Bernard, C.

AU - Bouchard, C. M.

AU - Detar, C.

AU - Du, Daping

AU - El-Khadra, A. X.

AU - Foley, J.

AU - Freeland, E. D.

AU - Gámiz, E.

AU - Gottlieb, Steven

AU - Heller, U. M.

AU - Kim, Jongjeong

AU - Kronfeld, A. S.

AU - Laiho, J.

AU - Levkova, L.

AU - MacKenzie, P. B.

AU - Meurice, Y.

AU - Neil, E.

AU - Oktay, M. B.

AU - Qiu, Si Wei

AU - Simone, J. N.

AU - Sugar, R.

AU - Toussaint, D.

AU - Van De Water, R. S.

AU - Zhou, Ran

PY - 2012/6/4

Y1 - 2012/6/4

N2 - We calculate form-factor ratios between the semileptonic decays B ̄0→D +-ν̄ and B̄s0→Ds+ -ν̄ with lattice QCD. These ratios are a key theoretical input in a new strategy to determine the fragmentation fractions of neutral B decays, which are needed for measurements of BR(Bs0→μ +μ -). We use the MILC ensembles of gauge configurations with 2+1 flavors of sea-quarks at two s of approximately 0.12 fm and 0.09 fm. We use the model-independent z parametrization to extrapolate our simulation results at small recoil toward maximum recoil. Our results for the form-factor ratios are f0(s)(Mπ2)/f0(d)(MK2)=1.046(44) stat(15) syst and f0(s)(Mπ2)/f0(d)(Mπ2)=1.054(47) stat(17) syst. In contrast to a QCD sum-rule calculation, no significant departure from U-spin (d↔s) symmetry is observed.

AB - We calculate form-factor ratios between the semileptonic decays B ̄0→D +-ν̄ and B̄s0→Ds+ -ν̄ with lattice QCD. These ratios are a key theoretical input in a new strategy to determine the fragmentation fractions of neutral B decays, which are needed for measurements of BR(Bs0→μ +μ -). We use the MILC ensembles of gauge configurations with 2+1 flavors of sea-quarks at two s of approximately 0.12 fm and 0.09 fm. We use the model-independent z parametrization to extrapolate our simulation results at small recoil toward maximum recoil. Our results for the form-factor ratios are f0(s)(Mπ2)/f0(d)(MK2)=1.046(44) stat(15) syst and f0(s)(Mπ2)/f0(d)(Mπ2)=1.054(47) stat(17) syst. In contrast to a QCD sum-rule calculation, no significant departure from U-spin (d↔s) symmetry is observed.

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U2 - 10.1103/PhysRevD.85.114502

DO - 10.1103/PhysRevD.85.114502

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

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

IS - 11

M1 - 114502

ER -

B _s→D _s/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ ⁺μ ^-)

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