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 & 6 others Si Wei Qiu, J. N. Simone, R. Sugar, William D Toussaint, R. S. Van De Water, Ran Zhou

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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 languageEnglish (US)
Article number114502
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume85
Issue number11
DOIs
StatePublished - Jun 4 2012

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form factors
quantum chromodynamics
decay
sum rules
fragmentation
quarks
symmetry
configurations
simulation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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B s→D s/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ +μ -). / Bailey, Jon A.; Bazavov, A.; Bernard, C.; Bouchard, C. M.; Detar, C.; Du, Daping; El-Khadra, A. X.; Foley, J.; Freeland, E. D.; Gámiz, E.; Gottlieb, Steven; Heller, U. M.; Kim, Jongjeong; Kronfeld, A. S.; Laiho, J.; Levkova, L.; MacKenzie, P. B.; Meurice, Y.; Neil, E.; Oktay, M. B.; Qiu, Si Wei; Simone, J. N.; Sugar, R.; Toussaint, William D; Van De Water, R. S.; Zhou, Ran.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 85, No. 11, 114502, 04.06.2012.

Research output: Contribution to journalArticle

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, WD, 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
Bailey, Jon A. ; Bazavov, A. ; Bernard, C. ; Bouchard, C. M. ; Detar, C. ; Du, Daping ; El-Khadra, A. X. ; Foley, J. ; Freeland, E. D. ; Gámiz, E. ; Gottlieb, Steven ; Heller, U. M. ; Kim, Jongjeong ; Kronfeld, A. S. ; Laiho, J. ; Levkova, L. ; MacKenzie, P. B. ; Meurice, Y. ; Neil, E. ; Oktay, M. B. ; Qiu, Si Wei ; Simone, J. N. ; Sugar, R. ; Toussaint, William D ; Van De Water, R. S. ; Zhou, Ran. / B s→D s/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ +μ -). In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2012 ; Vol. 85, No. 11.
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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.",
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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, William 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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