arXiv 1507.042492015-07hep-ph

作为$\bar{D}^Σ_c-\bar{D}^Σ_c^*$分子态的LHCb五夸克态

The LHCb pentaquark as a $\bar{D}^*Σ_c-\bar{D}^*Σ_c^*$ molecular state

L. Roca, J. Nieves, E. Oset

备注：: 4 pages, 2 figures
发表信息：: Phys. Rev. D 92, 094003 (2015)
DOI：: 10.1103/PhysRevD.92.094003

摘要：

我们对$Λ_b \to J/ψK^- p$反应进行了理论分析，最近的LHCb实验从中提取了$K^- p$谱中接近阈值的$Λ(1405)$贡献以及$J/ψ\,p$谱中隐藏魅力的两个重子态。我们记得，这种类型的重子态已经在理论上被预测匹配的质量，宽度和实验的$J^P$，具体地说，一些国家建立的$J/ψ\, N$，$\bar D^* Λ_c$，$\bar D^* Σ_c$，$\bar D Σ^*_c$和$\bar D^* Σ^*_c$耦合通道。我们假设在4450 MeV附近观测到的窄态具有这种性质，并且我们能够同时描述接近阈值的$K^- p$质量分布的形状和相对强度以及$J/ψ\,p$分布的峰值，其中$J/ψ\, p$耦合到共振的值与理论值一致。许多性质的非平凡匹配支持$J^P=3/2^-$分配给这种状态，并支持其作为主要由$\bar D^* Σ_c$和$\bar D^* Σ^*_c$组成的分子状态的性质。

英文摘要：

We perform a theoretical analysis of the $Λ_b \to J/ψK^- p$ reaction from where a recent LHCb experiment extracts a $Λ(1405)$ contribution in the $K^- p$ spectrum close to threshold and two baryon states of hidden charm in the $J/ψ\,p$ spectrum. We recall that baryon states of this type have been theoretically predicted matching the mass, width and $J^P$ of the experiment, concretely some states built up from the $J/ψ\, N$, $\bar D^* Λ_c$, $\bar D^* Σ_c$, $\bar D Σ^*_c$ and $\bar D^* Σ^*_c$ coupled channels. We assume that the observed narrow state around 4450 MeV has this nature and we are able to describe simultaneously the shapes and relative strength of the the $K^- p$ mass distribution close to threshold and the peak of the $J/ψ\,p$ distribution, with values of the $J/ψ\, p$ coupling to the resonance in line with the theoretical ones. The non trivial matching of many properties gives support to a $J^P=3/2^-$ assignment to this state and to its nature as a molecular state mostly made of $\bar D^* Σ_c$ and $\bar D^* Σ^*_c$.

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