arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1002.2999hep-lathep-ph
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格点量子色动力学中的$η$和$η^\prime$介子

The $η$ and $η^\prime$ mesons from Lattice QCD

N. H. Christ, C. Dawson, T. Izubuchi, C. Jung, Q. Liu, R. D. Mawhinney, C. T. Sachrajda, A. Soni, R. Zhou

摘要:

第九赝标介子$η^\prime$的大质量被认为是由QCD中存在的轴向异常和规范场拓扑结构的综合效应引起的。我们报告了一个现实的,2+1风味,格点量子色动力学计算的$η$和$η^\prime$质量和混合证实了这一点。物理本征态表现出混合角为$θ= -14.1(2.8)^\circ$的小的八重态-单重态混合。外推到物理轻夸克的质量,只有统计误差,$m_η=573(6)$ MeV和$m_{η^\prime}=947(142)$ MeV,与548 MeV和958 MeV的实验值一致。

英文摘要:

The large mass of the ninth pseudoscalar meson, the $η^\prime$, is believed to arise from the combined effects of the axial anomaly and the gauge field topology present in QCD. We report a realistic, 2+1 flavor, lattice QCD calculation of the $η$ and $η^\prime$ masses and mixing which confirms this picture. The physical eigenstates show small octet-singlet mixing with a mixing angle of $θ= -14.1(2.8)^\circ$. Extrapolation to physical light quark mass gives, with statistical errors only, $m_η=573(6)$ MeV and $m_{η^\prime}=947(142)$ MeV, consistent with the experimental values of 548 MeV and 958 MeV.

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