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arXiv 0707.4162hep-lathep-ph
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格点量子色动力学中粲偶素激发态谱

Charmonium excited state spectrum in lattice QCD

J. J. Dudek, R. G. Edwards, N. Mathur, D. G. Richards

摘要:

我们利用一个大基的协变导数介子内插场,证明了用变分法可靠地提取多个激发态的可行性。研究是在粲质量下含三叶草夸克的淬火各向异性晶格中进行的。我们演示了如何知识的连续极限的晶格插值字段可以提供额外的自旋分配信息,即使在一个单一的晶格间距,通过重叠因子的插值字段和状态。相对于夸克势模型的预测和实验状态,激发态的质量是系统性的高。我们的结论是,这是最有可能的淬火近似的结果。

英文摘要:

Working with a large basis of covariant derivative-based meson interpolating fields we demonstrate the feasibility of reliably extracting multiple excited states using a variational method. The study is performed on quenched anisotropic lattices with clover quarks at the charm mass. We demonstrate how a knowledge of the continuum limit of a lattice interpolating field can give additional spin-assignment information, even at a single lattice spacing, via the overlap factors of interpolating field and state. Excited state masses are systematically high with respect to quark potential model predictions and, where they exist, experimental states. We conclude that this is most likely a result of the quenched approximation.

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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