期刊
PHYSICAL REVIEW D
卷 80, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.80.014503
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资金
- DOE
- NSF (USA)
- STFC
- Royal Society and Leverhulme Trust (UK)
- Junta de Andalucia (Spain)
- U.S. DOE
- STFC [ST/G000581/1, ST/G00059X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G00059X/1, ST/G000581/1] Funding Source: researchfish
We study B-d and B-s mixing in unquenched lattice QCD employing the MILC Collaboration gauge configurations that include u, d, and s sea quarks based on the improved staggered quark (AsqTad) action and a highly improved gluon action. We implement the valence light quarks also with the AsqTad action and use the nonrelativistic NRQCD action for the valence b quark. We calculate hadronic matrix elements necessary for extracting Cabibbo-Kobayashi-Maskawa matrix elements from experimental measurements of mass differences Delta M-d and Delta M-s. We find xi equivalent to f(Bs)B(Bs)/f(Bd)B(Bd)=1.258(33), f(Bd)B(Bd)=216(15) MeV, and f(Bs)B(Bs)=266(18) MeV. We also update previous results for decay constants and obtain f(Bd)=190(13) MeV, f(Bs)=231(15) MeV, and f(Bs)/f(Bd)=1.226(26). The new lattice results lead to updated values for the ratio of Cabibbo-Kobayashi-Maskawa matrix elements |V-td|/|V-ts| and for the standard model prediction for Br(B-s ->mu(+)mu(-)) with reduced errors. We determine |V-td|/|V-ts|=0.214(1)(5) and Br(B-s ->mu(+)mu(-))=3.19(19)x10(-9).
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