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arXiv 1105.0583hep-phhep-ex
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相对论夸克-双夸克图象中重子的能谱和Regge轨线

Spectroscopy and Regge trajectories of heavy baryons in the relativistic quark-diquark picture

D. Ebert, R. N. Faustov, V. O. Galkin

摘要:

在QCD激发的相对论夸克模型框架下,在重夸克-轻双夸克图象中计算了重子的质量谱。在不应用非相对论v/c和重夸克1/mQ展开的情况下,完全相对论地处理了双夸克中轻夸克的动力学以及重子中重夸克和轻双夸克的动力学.这种方法使我们能够得到预测的重子质量相当高的轨道和径向激发。在此基础上,构造了重子轨道和径向激发的Regge轨线,并验证了它们的线性、平行性和等距性。考虑了重子的斜率和截距之间的关系,并对重子和重轻介子的Regge轨线斜率进行了比较。所有可用的重子实验数据都很好地符合所构造的Regge轨道。讨论了所观察到的受激粲重子的量子数的可能归属。

英文摘要:

Mass spectra of heavy baryons are calculated in the heavy-quark--light-diquark picture in the framework of the QCD-motivated relativistic quark model. The dynamics of light quarks in the diquark as well as the dynamics of the heavy quark and light diquark in the baryon are treated completely relativistically without application of nonrelativistic v/c and heavy quark 1/m_Q expansions. Such approach allows us to get predictions for the heavy baryon masses for rather high orbital and radial excitations. On this basis the Regge trajectories of heavy baryons for orbital and radial excitations are constructed, and their linearity, parallelism, and equidistance are verified. The relations between the slopes and intercepts of heavy baryons are considered and a comparison of the slopes of Regge trajectories for heavy baryons and heavy-light mesons is performed. All available experimental data on heavy baryons fit nicely to the constructed Regge trajectories. The possible assignment of the quantum numbers to the observed excited charmed baryons is discussed.

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