(B)over-bar → D*l(ν)over-bar form factor at zero recoil from three-flavor lattice QCD: A model independent determination of |Vcb|

被引：54

作者：

Bernard, C. ^{[1
]}

DeTar, C. ^{[2
]}

Di Pierro, M. ^{[3
]}

El-Khadra, A. X. ^{[4
]}

Evans, R. T. ^{[4
]}

Freeland, E. D. ^{[5
]}

Gamiz, E. ^{[4
]}

Gottlieb, Steven ^{[6
]}

Heller, U. M. ^{[7
]}

Hetrick, J. E. ^{[8
]}

Kronfeld, A. S. ^{[9
]}

Laiho, J. ^{[9
]}

Levkova, L. ^{[2
]}

Mackenzie, P. B. ^{[9
]}

Okamoto, M. ^{[9
]}

Simone, J. ^{[9
]}

Sugar, R. ^{[10
]}

Toussaint, D. ^{[11
]}

Van de Water, R. S. ^{[9
]}

机构：

[1] Washington Univ, Dept Phys, St Louis, MO 63130 USA

[2] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA

[3] Depaul Univ, Sch Comp Sci Telecommun & Informat Syst, Chicago, IL 60604 USA

[4] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[5] Sch Art Inst Chicago, Liberal Arts Dept, Chicago, IL USA

[6] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA

[7] Amer Phys Soc, Ridge, NY USA

[8] Univ Pacific, Dept Phys, Stockton, CA USA

[9] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[10] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[11] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

来源：

PHYSICAL REVIEW D | 2009年 / 79卷 / 01期

基金：

美国能源部; 美国国家科学基金会;

关键词：

DECAYS; TRANSITIONS; SCALE;

D O I：

10.1103/PhysRevD.79.014506

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first lattice QCD calculation of the form factor for (B) over bar -> D*l (v) over bar with three flavors of sea quarks. We use an improved staggered action for the light valence and sea quarks ( the MILC configurations), and the Fermilab action for the heavy quarks. The form factor is computed at zero recoil using a new double ratio method that yields the form factor more directly than the previous Fermilab method. Other improvements over the previous calculation include the use of much lighter light-quark masses, and the use of lattice ( staggered) chiral perturbation theory in order to control the light-quark discretization errors and chiral extrapolation. We obtain for the form factor, F-B -> D* (1) = 0. 921(13)(20), where the first error is statistical and the second is the sum of all systematic errors in quadrature. Applying a 0.7% electromagnetic correction and taking the latest PDG average for F-B -> D* (1)vertical bar V-cb vertical bar leads to vertical bar V-cb vertical bar = (38. 7 +/- 0.9(exp) +/- 1.0(theo)) X 10(-3).

引用

页数：20

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