arXiv 2009.043672020-09-09hep-phnucl-th

某些奇异强子的分子性质

The molecular nature of some exotic hadrons

A. Ramos, A. Feijoo, Q. Llorens, G. Montaña

备注：: 18 pages, 9 figures, to appear in a Special Issue of Few-Body Systems
DOI：: 10.1007/s00601-020-01566-0

摘要：

LHCb令人兴奋地发现了$P_c(4312)^+$和$P_c(4450)^+$五夸克态，或者说在BESIII和Belle观测到的$Z_c(3900)$态具有四夸克态的性质，这在强子物理学领域引发了大量的活动，新的实验计划用于寻找其他奇异的介子和重子，许多理论发展试图从它们可能的分子起源中解开真正的多夸克性质。在简要回顾了这些搜索的现状之后，本文重点讨论了最近看到的或尚未发现的奇异重子，它们可能出现在耦合通道中的一个方便的么正化介子-重子相互作用模型中。特别是，我们将展示如何在不同的耦合通道的振幅的模型之间的干扰可能会揭示一个$N^*$共振2 GeV左右具有介子-重子准束缚态性质的存在。我们还讨论了最近在LHCb发现的一些$Ω_c$状态作为强子分子的可能解释。该模型还预测了双粲准介子重子$Ξ_{cc}$态的存在，这将是基态$Ξ_{cc}(3621)$ MeV的激发态，其质量最近才被确定。这些结果的扩展到底部部门也将提交。

英文摘要：

The exciting discovery by LHCb of the $P_c(4312)^+$ and $P_c(4450)^+$ pentaquarks, or the suggestion of a tetraquark nature for the $Z_c(3900)$ state seen at BESIII and Belle, have triggered a lot of activity in the field of hadron physics, with new experiments planned for searching other exotic mesons and baryons, and many theoretical developments trying to disentangle the true multiquark nature from their possible molecular origin. After a brief review of the present status of these searches, this paper focusses on recently seen or yet to be discovered exotic heavy baryons that may emerge from a conveniently unitarized meson-baryon interaction model in coupled channels. In particular, we will show how interferences between the different coupled-channel amplitudes of the model may reveal the existence of a $N^*$ resonance around 2 GeV having a meson-baryon quasi-bound state nature. We also discuss the possible interpretation of some of the $Ω_c$ states recently discovered at LHCb as being hadron molecules. The model also predicts the existence of doubly-charmed quasibound meson-baryon $Ξ_{cc}$ states, which would be excited states of the ground-state $Ξ_{cc}(3621)$ MeV, whose mass has only been recently established. Extensions of these results to the bottom sector will also be presented.

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