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arXiv 0904.4068hep-ph
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粲偶素光谱中的耦合通道效应和屏蔽效应

Coupled-Channel and Screening Effects in Charmonium Spectrum

Bai-Qing Li, Ce Meng, Kuang-Ta Chao

摘要:

使用相同的淬火极限作为输入,我们比较了耦合通道模型和屏蔽势模型预测的粲偶素光谱在质量区域低于4 GeV,其中的贡献,从衰变通道涉及P波(以及甚至更高的激发)D介子可以忽略不计。我们发现这两个模型在描述粲偶素谱时具有相似的整体特征,因为它们体现了动力学轻夸克对真空极化的相同效应。这一协议是令人鼓舞的使用屏蔽潜力,以进一步描述更高的charmonium在该地区的4 GeV以上的质谱。这两个模型的应用将有助于阐明B工厂和其他实验中新发现的“X,Y,Z”介子的性质。特别是,我们显示了S波衰减耦合效应对降低$χ_{c1}(2P)$质量的$D\bar {D^*}$阈值,在支持的分配的X(3872)作为一个$χ_{c1}(2P)$占主导地位的粲偶素状态。

英文摘要:

Using the same quenched limit as input, we compare the charmonium spectra predicted by the coupled-channel model and the screened potential model in the mass region below 4 GeV, in which the contributions from decay channels involving P-wave (as well as even higher excited) D mesons can be neglected. We find that the two models have similar global features in describing charmonium spectrum since they embody the same effect of the vacuum polarization of dynamical light quark pairs. This agreement is encouraging for using the screened potential to further describe the mass spectrum of higher charmonium in the region above 4 GeV. Applying both models will be helpful to clarify the nature of the newly discovered "X,Y,Z" mesons in B-factories and other experiments. In particular, we show the S-wave decay coupling effect on lowering the $χ_{c1}(2P)$ mass towards the $D\bar {D^*}$ threshold, in support of the assignment of the X(3872) as a $χ_{c1}(2P)$-dominated charmonium state.

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