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arXiv 0710.2201hep-lathep-ph
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猝灭QCD连续极限下的重奇异介子衰变常数

Heavy-strange meson decay constants in the continuum limit of quenched QCD

Michele Della Morte, Stephan Durr, Damiano Guazzini, Jochen Heitger, Andreas Juttner, Rainer Sommer

摘要:

我们改进了以前的一个用奇异夸克代替轻夸克的重-轻赝标介子衰变常数猝灭的结果。一个更精细的晶格分辨率(a ~ 0.05 fm)在静态近似计算的数据的连续极限外推。我们还给出了进一步的细节,以保持在大的晶格尺寸L/a的统计和系统误差的控制下使用的技术。我们的最终结果,结合D_s附近赝标介子衰变常数的测定,很好地符合了1/m展开的定性预期,(相对)1/m项约为-0.5GeV/mPS。在物理b夸克质量下,我们得到F_{B_s} = 193(7)MeV,其中包括除猝灭近似外的所有误差。

英文摘要:

We improve a previous quenched result for heavy-light pseudoscalar meson decay constants with the light quark taken to be the strange quark. A finer lattice resolution (a ~ 0.05 fm) in the continuum limit extrapolation of the data computed in the static approximation is included. We also give further details concerning the techniques used in order to keep the statistical and systematic errors at large lattice sizes L/a under control. Our final result, obtained by combining these data with determinations of the decay constant for pseudoscalar mesons around the D_s, follows nicely the qualitative expectation of the 1/m-expansion with a (relative) 1/m-term of about -0.5 GeV/m_PS. At the physical b-quark mass we obtain F_{B_s} = 193(7) MeV, where all errors apart from the quenched approximation are included.

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