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arXiv 0811.2599hep-ph
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夸克偶素中自旋相关的相互作用

Spin-dependent interactions in quarkonia

A. M. Badalian, A. V. Nefediev, Yu. A. Simonov

摘要:

在场相关方法的框架下,详细讨论了介子中自旋相关的相互作用。在考虑QCD弦转动惯量的情况下,导出了重、轻夸克偶素中自旋相关势的解析表达式。用这些公式分析了最近的格点数据,结果表明,这些数据与胶子相关长度的很小值(<0.1 fm)是一致的。本文比较了场相关子和Eichten-Feinberg在QCD真空的最低高斯近似下对自旋相关势的定义,证明了这两种方法在真空相关长度为零的情况下是等价的,而在真空相关长度为有限值的情况下,这两种方法之间的差别可以用高阶场相关子的贡献来解释。从四次方程开始

英文摘要:

The spin-dependent interactions in mesons are considered in detail in the framework of the Field Correlator Method. Analytic expressions for the spin-dependent potentials in heavy and light quarkonia are derived with the QCD string moment of inertia taken into account. Recent lattice data are analysed using these formulae and the data are shown to be consistent with very small values of the gluonic correlation length, <0.1 fm. The Field Correlator and the Eichten-Feinberg definitions of the spin-dependent potentials in the lowest, Gaussian approximation for the QCD vacuum are compared to one another and the two approaches are shown to be equivalent in the limit of a vanishing vacuum correlation length, whereas for finite values of the latter the difference between these two approaches can be explained by the contribution of the higher-order field corelators, starting from the quartic one.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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