期刊
PHYSICAL REVIEW D
卷 85, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.85.114502
关键词
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资金
- Office of Science of the United States Department of Energy
- Pittsburgh Supercomputer Center
- San Diego Supercomputer Center
- Texas Advanced Computing Center through the National Science Foundation's Teragrid/XSEDE
- U.S. Department of Energy [DE-FG02-91ER40628, DOE FG02-91ER40664, DE-FC02-06ER41446, DE-FG02-91ER40661, DE-FG02-91ER40677, DE-FG02-04ER-41298]
- National Science Foundation [PHY-0555243, PHY-0757333, PHY-0703296, PHY-0757035]
- URA
- Fermilab Fellowship in Theoretical Physics
- Science and Technology Facilities Council
- Scottish Universities Physics Alliance
- MICINN (Spain) [FPA2010-16696]
- Ramon y Cajal
- Junta de Andalucia (Spain) [FQM-101, FQM-330, FQM-6552]
- NRF [3348-20090015]
- Korean government (MEST)
- Brookhaven Science Associates, LLC [DE-AC02-98CH10886]
- U.S. Department of Energy
- Fermi Research Alliance, LLC [DE-AC02-07CH11359]
- STFC [ST/J000442/1, ST/G00059X/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Physics [757333] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [0903571, 757035, 1067881] Funding Source: National Science Foundation
- Office of Advanced Cyberinfrastructure (OAC)
- Direct For Computer & Info Scie & Enginr [0910735] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/G00059X/1, ST/J000442/1] Funding Source: researchfish
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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