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arXiv 1105.0855hep-ph
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具有耦合通道效应的Bottomonium谱

Bottomonium Spectrum with Coupled-Channel Effects

Jia-Feng Liu, Gui-Jun Ding

摘要:

本文研究了具有耦合通道效应的非相对论性夸克模型中的底鎓能谱。质量位移和化合价$b\bar{b}$分量被评估为相当大。我们发现,强子回路的影响可以部分吸收到模型参数的重新选择。在考虑和不考虑耦合通道效应的夸克模型中,除了质量约为10890 MeV的$Υ(5\,^1S_0)$和$Υ(5\,^3S_1)$外,均未发现底偶素态,因此,如果证实$Y_{b}(10890)$是一种新的共振态,我们认为它是一种超越夸克模型的奇异态.对$χ_b(3P)$质量的预测与ATLAS测量结果一致。如果将来在LHCb或SuperB上观察到一些新的类底鎓态,我们可以通过将它们的质量与我们工作中预测的质谱进行比较来确定它们是传统的底鎓态还是奇异态。

英文摘要:

We study the bottomonium spectrum in the nonrelativistic quark model with the coupled-channel effects. The mass shifts and valence $b\bar{b}$ component are evaluated to be rather large. We find that the hadronic loop effects can be partially absorbed into a reselection of the model parameters. No bottomonium state except $Υ(5\,^1S_0)$ and $Υ(5\,^3S_1)$ with mass around 10890 MeV is found in the quark models both with and without coupled-channel effects, so we suggest that $Y_{b}(10890)$ is an exotic state beyond the quark model, if it is confirmed to be a new resonance. The predictions for the $χ_b(3P)$ masses are consistent with the ATLAS measurements. If some new bottomonium-like states are observed at LHCb or SuperB in the future, we can determine whether they are conventional bottomonium or exotic states by comparing their masses with the mass spectrum predicted in our work.

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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