TY - JOUR
T1 - Update of |Vcb | from the B ̄ →d* ν ̄ form factor at zero recoil with three-flavor lattice QCD UPDATE of |Vcb | from the ... JON A. BAILEY et al.
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 - Kronfeld, A. S.
AU - Laiho, J.
AU - Levkova, L.
AU - MacKenzie, P. B.
AU - Neil, E. T.
AU - Qiu, Si Wei
AU - Simone, J.
AU - Sugar, R.
AU - Toussaint, D.
AU - Van De Water, R. S.
AU - Zhou, Ran
PY - 2014/6/19
Y1 - 2014/6/19
N2 - We compute the zero-recoil form factor for the semileptonic decay B̄0→D*+-ν̄ (and modes related by isospin and charge conjugation) using lattice QCD with three flavors of sea quarks. We use an improved staggered action for the light valence and sea quarks (the MILC asqtad configurations), and the Fermilab action for the heavy quarks. Our calculations incorporate higher statistics, finer lattice spacings, and lighter quark masses than our 2008 work. As a byproduct of tuning the new data set, we obtain the Ds and Bs hyperfine splittings with few-MeV accuracy. For the zero-recoil form factor, we obtain F(1)=0.906(4)(12), where the first error is statistical and the second is the sum in quadrature of all systematic errors. With the latest Heavy Flavor Averaging Group average of experimental results and a cautious treatment of QED effects, we find |Vcb|=(39.04±0.49expt±0. 53QCD±0.19QED)×10-3. The QCD error is now commensurate with the experimental error.
AB - We compute the zero-recoil form factor for the semileptonic decay B̄0→D*+-ν̄ (and modes related by isospin and charge conjugation) using lattice QCD with three flavors of sea quarks. We use an improved staggered action for the light valence and sea quarks (the MILC asqtad configurations), and the Fermilab action for the heavy quarks. Our calculations incorporate higher statistics, finer lattice spacings, and lighter quark masses than our 2008 work. As a byproduct of tuning the new data set, we obtain the Ds and Bs hyperfine splittings with few-MeV accuracy. For the zero-recoil form factor, we obtain F(1)=0.906(4)(12), where the first error is statistical and the second is the sum in quadrature of all systematic errors. With the latest Heavy Flavor Averaging Group average of experimental results and a cautious treatment of QED effects, we find |Vcb|=(39.04±0.49expt±0. 53QCD±0.19QED)×10-3. The QCD error is now commensurate with the experimental error.
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U2 - 10.1103/PhysRevD.89.114504
DO - 10.1103/PhysRevD.89.114504
M3 - Article
AN - SCOPUS:84902988281
SN - 1550-7998
VL - 89
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 11
M1 - 114504
ER -