arXiv 1002.47102010-02-25hep-lat

格点量子色动力学的重子谱

Heavy-Baryon Spectroscopy from Lattice QCD

Huey-Wen Lin, Saul D. Cohen, Liuming Liu, Nilmani Mathur, Kostas Orginos, Andre Walker-Loud

备注：: Invited talk at Conference of Computational Physics 2009. 3 pages
发表信息：: Comput.Phys.Commun.182:24-26,2011
DOI：: 10.1016/j.cpc.2010.07.004

摘要：

我们用四维格点计算全QCD（量子色动力学，夸克和胶子的强相互作用的非平衡规范理论）的路径积分来确定粲重子和底重子的质量。在粲区，我们的结果与我们的系统学实验符合得很好，除了自旋为1/2的$Ξ_{cc}$，我们发现它的同位旋平均质量为$Ξ_{cc}$为$3665\pm17\pm14^{+0}_{-78}$ MeV。我们预测（同位旋平均）自旋1/2 $Ω_{cc}$的质量为$3763\pm19\pm26^{+13}_{-79}$ {MeV}。在底部，我们的结果也与我们的统计和系统误差内的实验观察和其他晶格计算一致。特别是，我们发现$Ω_b$的质量与最近的CDF测量是一致的。我们还预测了尚未观测到的$Ξ^\prime_b$的质量为5955（27）MeV。

英文摘要：

We use a four-dimensional lattice calculation of the full-QCD (quantum chromodynamics, the non-abliean gauge theory of the strong interactions of quarks and gluons) path integrals needed to determine the masses of the charmed and bottom baryons. In the charm sector, our results are in good agreement with experiment within our systematics, except for the spin-1/2 $Ξ_{cc}$, for which we found the isospin-averaged mass to be $Ξ_{cc}$ to be $3665\pm17\pm14^{+0}_{-78}$ MeV. We predict the mass of the (isospin-averaged) spin-1/2 $Ω_{cc}$ to be $3763\pm19\pm26^{+13}_{-79}$ {MeV}. In the bottom sector, our results are also 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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