格点量子色动力学的Omega_bbb激发态光谱
Omega_bbb excited-state spectroscopy from lattice QCD
摘要：
三重重子是非常有趣的系统，类似于重夸克偶素，但很难通过实验获得。格点量子色动力学可以为这些系统提供精确的预言，可以与其他理论方法相媲美。本文用格点NRQCD方法计算了Omega_bbb重子的激发态谱，用畴壁作用量方法计算了u，d和s海夸克的激发态谱.计算是针对海夸克质量的多个值和两种不同的晶格间距进行的。计算了角动量达到J=7/2的态的能量，分析了晶格对转动对称破缺的影响。精确的结果，即使是小的自旋相关的能量分裂，并研究了个人NRQCD相互作用对这些能量分裂的贡献。结果进行了比较，潜在的模型计算。
英文摘要：
Triply heavy baryons are very interesting systems analogous to heavy quarkonia, but are difficult to access experimentally. Lattice QCD can provide precise predictions for these systems, which can be compared to other theoretical approaches. In this work, the spectrum of excited states of the Omega_bbb baryon is calculated using lattice NRQCD for the b quarks, and using a domain-wall action for the u, d and s sea quarks. The calculations are done for multiple values of the sea-quark masses, and for two different lattice spacings. The energies of states with angular momentum up to J=7/2 are calculated, and the effects of rotational symmetry breaking by the lattice are analyzed. Precise results are obtained even for the small spin-dependent energy splittings, and the contributions of individual NRQCD interactions to these energy splittings are studied. The results are compared to potential-model calculations.
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