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arXiv 0808.0073hep-phhep-exnucl-th
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X(3872)和其他可能的重分子态

X(3872) and Other Possible Heavy Molecular States

Xiang Liu, Zhi-Gang Luo, Yan-Rui Liu, Shi-Lin Zhu

摘要:

本文在介子交换模型的框架下,系统地研究了重介子对$D\bar D$、$D^\ast\bar D$、$D^\ast \bar D^\ast$等分子的可能态。交换介子包括赝标介子、标量介子和矢量介子。通过研究发现:(1)X(3764)结构不是分子态;(2)具有$J=0, 1$的$D^*\bar D^*$系统在$r < 1$ fm范围内存在强吸引.如果将来的实验证实$Z^+(4051)$是一种松散结合的分子态,那么它的量子数可能是$J^{P}=0^+$。它的伙伴态$Φ^{**0}$可以在$π^0χ_{c1}$通道中搜索到;(3)矢量介子交换在$D^\ast \bar D$通道中与π介子交换一起提供强吸引。存在一个合理的截止参数$Λ\sim 1.4$ GeV的束缚态解。X(3872)可能是一个动态的分子态,但要得出非常明确的结论还需要进一步的研究:(4)存在$B^\ast \bar B$分子态。

英文摘要:

We perform a systematic study of the possible molecular states composed of a pair of heavy mesons such as $D\bar D$, $D^\ast\bar D$, $D^\ast \bar D^\ast$ in the framework of the meson exchange model. The exchanged mesons include the pseudoscalar, scalar and vector mesons. Through our investigation, we find that (1) the structure X(3764) is not a molecular state; (2) There exists strong attraction in the range $r < 1$ fm for the $D^*\bar D^*$ system with $J=0, 1$. If future experiments confirm $Z^+(4051)$ as a loosely bound molecular state, its quantum number is probably $J^{P}=0^+$. Its partner state $Φ^{**0}$ may be searched for in the $π^0χ_{c1}$ channel; (3) The vector meson exchange provides strong attraction in the $D^\ast \bar D$ channel together with the pion exchange. A bound state solution exists with a reasonable cutoff parameter $Λ\sim 1.4$ GeV. X(3872) may be accommodated as a molecular state dynamically although drawing a very definite conclusion needs further investigation; (4) The $B^\ast \bar B$ molecular state exists.

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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