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

被引：51
|
作者：
Bailey, Jon A. [1 ]
Bazavov, A. [2 ]
Bernard, C. [3 ]
Bouchard, C. M. [4 ,5 ,6 ]
DeTar, C. [7 ]
Du, Daping [4 ,5 ,8 ]
El-Khadra, A. X. [4 ]
Foley, J. [7 ]
Freeland, E. D. [4 ,9 ]
Gamiz, E. [5 ,10 ,11 ]
Gottlieb, Steven [12 ]
Heller, U. M. [13 ]
Kim, Jongjeong [14 ]
Kronfeld, A. S. [5 ]
Laiho, J. [15 ]
Levkova, L. [7 ]
Mackenzie, P. B. [5 ]
Meurice, Y. [8 ]
Neil, E. [5 ]
Oktay, M. B. [7 ]
Qiu, Si-Wei [7 ]
Simone, J. N. [5 ]
Sugar, R. [16 ]
Toussaint, D. [14 ]
Van de Water, R. S. [2 ]
Zhou, Ran [12 ]
机构：
[1] Seoul Natl Univ, Dept Phys & Astron, Seoul, South Korea
[2] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
[3] Washington Univ, Dept Phys, St Louis, MO 63130 USA
[4] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
[5] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA
[6] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
[7] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA
[8] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[9] Benedictine Univ, Dept Phys, Lisle, IL USA
[10] Univ Granada, CAFPE, Granada, Spain
[11] Univ Granada, Dept Fis Teor & Cosmos, Granada, Spain
[12] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA
[13] Amer Phys Soc, Ridge, NY USA
[14] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
[15] Univ Glasgow, Sch Phys & Astron, SUPA, Glasgow, Lanark, Scotland
[16] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA
来源：
PHYSICAL REVIEW D | 2012年 / 85卷 / 11期
基金：
美国国家科学基金会; 英国科学技术设施理事会; 美国能源部;
关键词：
IMPROVED LATTICE ACTION; RARE DECAYS B-S(0); QCD; MU(+)MU(-); SYMMETRY; SEARCH; B-0;
D O I：
10.1103/PhysRevD.85.114502
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We calculate form-factor ratios between the semileptonic decays ($) over bar (0) -> D+ l(-) nu(-) and (nu) over bar (0)(s) -> D-s(+) l(-) (nu) over bar 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(B-s(0) -> mu(+)mu(-)). 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 f(0)((s)) (M-pi(2))/ f(0)((d)) (M-K(2)) = 1.046(44)(stat)(15)(syst) and f(0)((s)) (M-pi(2))/ f(0)((d))(M-pi(2)) = 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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页数：19
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