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arXiv 1707.08306hep-ph
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重分子与单$σ/ω$ -交换模型

Heavy molecules and one-$σ/ω$-exchange model

Rui Chen, Xiang Liu, Atsushi Hosaka

摘要:

在单玻色子交换模型的框架下,我们探讨了来自$σ/ω$交换的中短程力是否足够强以束缚重分子态。$Λ_cD(\bar{D})$和$Λ_cΛ_c(\barΛ_c)$体系进行了研究和比较。我们发现$σ$ -交换力是吸引力和支配力,而$ω$ -交换力不是.因此,S波$Λ_cD$、$Λ_cΛ_c$和$Λ_c\barΛ_c$可能是分子候选者。我们进一步指出,一个强子-强子系统中含有较多的轻夸克$(u,d)$,更容易形成束缚态。另外,通过研究类$Λ_cD(\bar{D})$和类$Λ_cΛ_c(\barΛ_c)$系统的重夸克质量依赖性,我们发现粲/底扇区可以很容易地容纳分子态。最后,研究了$Λ_cN(\bar{N})$和$Λ_bN(\bar{N})$系统。我们的结果表明,它们也可能形成束缚态。通过包括一个- $π$ -交换力提供额外的吸引力时,耦合通道包括在内,我们预计在重夸克部门的许多分子状态。

英文摘要:

In the framework of the one-boson-exchange model, we explore whether the intermediate and short-range forces from $σ/ω$-exchange can be strong enough to bind heavy molecular states. $Λ_cD(\bar{D})$, and $Λ_cΛ_c(\barΛ_c)$ systems have been studied and compared. We find that the force from $σ$-exchange is attractive and dominant, whereas the $ω$-exchange force not. As a consequence, the S-wave $Λ_cD$, $Λ_cΛ_c$, and $Λ_c\barΛ_c$ can be possible molecular candidates. We further indicate that one hadron-hadron system with more light quarks $(u,d)$ can be easier to form a bound state. As a byproduct, by studying the heavy-quark mass dependence for the $Λ_cD(\bar{D})$-like and $Λ_cΛ_c(\barΛ_c)$-like systems, we find that the charm/bottom sector can easily accommodates molecular states. Finally, the $Λ_cN(\bar{N})$ and $Λ_bN(\bar{N})$ systems are investigated. Our results indicate that they are also likely to form bound states. By including one-$π$-exchange forces providing additional attraction when coupled channels are included, we expect many molecular states in heavy quark sectors.

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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