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arXiv 1908.03528hep-ph
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$P_c(4440)$和$P_c(4457)$态的分子解释

Molecular Interpretation of the $P_c(4440)$ and $P_c(4457)$ States

T. J. Burns, E. S. Swanson

摘要:

提出了$P_c(4457)$和$P_c(4440)$ LHCb态的分子模型。该模型依赖于通道耦合的长程π介子交换动力学的功能,关键取决于新增加的$Λ_c(2595)\bar D$通道。该模型的一个惊人预测是量子数$J^P(4457) = 1/2^+$和$J^P(4440) = 3/2^-$的不寻常组合。与其他模型不同的是,在不引入额外的短程相互作用的情况下实现了对两种状态的同时描述。该模型也给出了一个自然的解释的状态的相对宽度。我们发现,通常的分子方案不能解释$Λ_b$衰变的$P_c$状态的生产率,这可以通过包括$Λ_c(2595)\bar D$和相关通道来解决。实验测试和其他状态进行了讨论的结论。

英文摘要:

A molecular model of the $P_c(4457)$ and $P_c(4440)$ LHCb states is proposed. The model relies on channels coupled by long range pion-exchange dynamics with features that depend crucially on the novel addition of the $Λ_c(2595)\bar D$ channel. A striking prediction of the model is the unusual combination of quantum numbers $J^P(4457) = 1/2^+$ and $J^P(4440) = 3/2^-$. Unlike in other models, a simultaneous description of both states is achieved without introducing additional short-range interactions. The model also gives a natural explanation for the relative widths of the states. We show that the usual molecular scenarios cannot explain the production rate of $P_c$ states in $Λ_b$ decays, and that this can be resolved by including $Λ_c(2595)\bar D$ and related channels. Experimental tests and other states are discussed in the conclusions.

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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