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arXiv 2109.01259hep-ph
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用复标度法探测强子双共振态

Probing double hadron resonances by the complex scaling method

Zhuo Yu, Mao Song, Jian-You Guo, Yu Zhang, Gang Li

摘要:

许多新发现的激发态被解释为强子的束缚态。这些强子也能形成共振态吗?本文将复标度法(CSM)推广到$Λ_c D(\bar D)$和$Λ_c Λ_c (\bar Λ_c)$体系的束缚态和共振态的计算。对于这些系统,$π, η, ρ$介子交换的贡献被抑制,来自$σ/ω$交换的中短程力的贡献占主导地位.结果表明,$Λ_c D$体系不能形成束缚态和共振态。$Λ_c \bar D$和$Λ_c Λ_c (\bar Λ_c)$体系在很宽的参数范围内存在共振态。对于这些系统,束缚态能量越大,越容易形成共振态。在所有的共振态中,P波共振态的能量和宽度都较小且较稳定,这在实验中是可以观察到的。D波和F波共振态的能量可达几十MeV,宽度可达几百MeV。

英文摘要:

Many newly discovered excited states are interpreted as bound states of hadrons. Can these hadrons also form resonant states? In this paper, we extend the complex scaling method (CSM) to calculate the bound state and resonant state consistently for the $Λ_c D(\bar D)$ and $Λ_c Λ_c (\bar Λ_c)$ systems. For these systems, the $π, η, ρ$ meson exchange contributions are suppressed, the contributions of intermediate- and short-range forces from $σ/ω$ exchange are dominant. Our results indicate that $Λ_c D$ system can not form bound state and resonant state. There exist resonant states in a wide range of parameters for $Λ_c \bar D$ and $Λ_c Λ_c (\bar Λ_c)$ systems. For these systems, the larger bound state energy, the easier to form resonant states. Among all the resonant states, the energies and widths of the P wave resonant states are smaller and more stable, which is possible to be observed in the experiments. The energies of D and F wave resonant states can reach dozens of MeV and the widths can reach hundreds of MeV.

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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