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arXiv 2207.03022hep-phhep-exhep-lat
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Belle合作组新发现的$Λ_c(2910)^+$重子及其可能的底伴的解释

Interpretation of the $Λ_c(2910)^+$ baryon newly seen by Belle Collaboration and its possible bottom partner

K. Azizi, Y. Sarac, H. Sundu

摘要:

近年来,随着实验设备和分析技术的发展,从传统的强子激发到各种奇异态,强子态已经被观测到。单重夸克重子态是研究强相互作用非微扰性质的一个重要领域。最近,Belle合作组织宣布观测到$Λ_c(2910)^+$状态,质量为$2913.8\pm5.6\pm3.8~\mathrm{MeV}/c^2$,宽度为$51.8\pm20.0\pm18.8~\mathrm{MeV}$。本文通过对$Λ_c$通道上不同激发态的质量分析,并与已有的实验结果进行比较,发现这个新发现的激发态的自旋宇称为$ J^P= \frac{1}{2}^-$,是一个用$Λ_c(\frac{1}{2}^-,2P)$表示的$ 2P $态。我们还预测了它的电流耦合,这可以作为研究该粒子的不同衰变和相互作用的主要输入参数之一。我们还确定了$Λ_b(\frac{1}{2}^-,2P)$的质量和电流耦合作为新的$Λ_c(2910)^+$状态的可能的底部对应物,这可能是在不久的将来不同的实验议程。

英文摘要:

The developments in the experimental facilities and analyses techniques have recently lead to the observation of many hadronic states ranging from excitations of conventional hadrons to various exotic states. The baryons with single heavy quark are among these states providing an attractive field of research to get a better understanding of the nonperturbative nature of the strong interaction. Recently, the Belle Collaboration announced observation of the state $Λ_c(2910)^+$ with a mass $2913.8\pm5.6\pm3.8~\mathrm{MeV}/c^2$ and width $51.8\pm20.0\pm18.8~\mathrm{MeV}$. In the present study, by the mass analyses of different excitations at $Λ_c$ channel and their comparison with existing experimental information, we find that the spin-parity of this newly found excited state is $ J^P= \frac{1}{2}^-$ and it is a $ 2P $ state denoting by $Λ_c(\frac{1}{2}^-,2P)$. We predict its current coupling as well, which can be served as one of the main input parameters to investigate different decays and interactions of this particle. We also determine the mass and current coupling of $Λ_b(\frac{1}{2}^-,2P)$ as possible bottom counterpart of the new $Λ_c(2910)^+$ state, which may be in agenda of different experiments in near future.

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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