2+1味格点上静态夸克Action的底强子质量分裂
Bottom-Hadron Mass Splittings from Static-Quark Action on 2+1-Flavor Lattices
摘要：
我们用全QCD方法计算了底强子相对于$B_d$和$Λ_b$的质量分裂，其中包括2+1味的动态Kogut-Susskind海夸克和畴壁价夸克以及静态重夸克.我们的晶格具有$(2.5{fm})^3$的空间体积，晶格间距约为0.124 fm，π介子质量范围低至291 MeV。在统计误差和系统误差范围内，我们的结果与实验观测和其他晶格计算结果一致。特别是，我们发现$Ω_b$的质量与最近的CDF测量是一致的。我们还预测尚未观测到的$Ξ^\prime_b$的质量为5955（27）MeV。
英文摘要：
We calculate bottom-hadron mass splittings with respect to $B_d$ and $Λ_b$ using full QCD with 2+1 flavors of dynamical Kogut-Susskind sea quarks and domain-wall valence quarks along with a static heavy quark. Our lattices have spatial volume of $(2.5{fm})^3$ with lattice spacing about 0.124 fm and a range of pion masses as low as 291 MeV. Our results are in agreement with experimental observations and other lattice calculations within our statistical and systematic errors. In particular, we find the mass of the $Ω_b$ to be consistent with the recent CDF measurement. We also predict the mass for the as yet unobserved $Ξ^\prime_b$ to be 5955(27) MeV.
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