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arXiv 1304.4522hep-phhep-ex
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重夸克偶素杂化体的质量谱

Mass Spectrum of Heavy Quarkonium Hybrids

Wei Chen, R. T. Kleiv, T. G. Steele, B. Bulthuis, D. Harnett, J. Ho, T. Richards, Shi-Lin Zhu

摘要:

我们将具有不同$J^{PC}$量子数的重夸克偶素杂化算符的关联函数的计算推广到包括六维的QCD凝聚。与以前的分析不能优化某些$J^{PC}$的QCD求和规则相比,最近的工作表明,包含六维凝聚稳定的混合求和规则,并允许可靠的质量预测。在这项工作中,我们已经调查的影响,第六维凝聚的其余通道。在进行QCD求和规则分析后,我们用奇异和非奇异的量子数更新了粲偶素和底偶素混合体的质谱。我们发现,负宇称态与$J^{PC}=(0, 1, 2)^{-+}, 1^{--}$形成最轻的混合超多重态,而正宇称态与$J^{PC}=(0, 1)^{+-}, (0, 1, 2)^{++}$属于一个较重的混合超多重态,证实了超多重态结构中发现的其他方法。与$J^{PC}=0^{--}$的混合物具有更高的质量,这可能表明与其他通道相比,胶子场的激发不同。与以前的结果一致,我们发现$J^{PC}=1^{++}$粲偶素杂化体比X(3872)重得多,这似乎排除了对这种状态的纯粲偶素杂化体解释。

英文摘要:

We have extended the calculation of the correlation functions of heavy quarkonium hybrid operators with various $J^{PC}$ quantum numbers to include QCD condensates up to dimension six. In contrast to previous analyses which were unable to optimize the QCD sum-rules for certain $J^{PC}$, recent work has shown that inclusion of dimension six condensates stabilizes the hybrid sum-rules and permits reliable mass predictions. In this work we have investigated the effects of the dimension six condensates on the remaining channels. After performing the QCD sum-rule analysis, we update the mass spectra of charmonium and bottomonium hybrids with exotic and non-exotic quantum numbers. We identify that the negative-parity states with $J^{PC}=(0, 1, 2)^{-+}, 1^{--}$ form the lightest hybrid supermultiplet while the positive-parity states with $J^{PC}=(0, 1)^{+-}, (0, 1, 2)^{++}$ belong to a heavier hybrid supermultiplet, confirming the supermultiplet structure found in other approaches. The hybrid with $J^{PC}=0^{--}$ has a much higher mass which may suggest a different excitation of the gluonic field compared to other channels. In agreement with previous results, we find that the $J^{PC}=1^{++}$ charmonium hybrid is substantially heavier than the X(3872), which seems to preclude a pure charmonium hybrid interpretation for this state.

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