New insights into the nature of the $\Lambda(1380)$ and $\Lambda(1405)$ resonances away from the SU(3) limit

Feng-Kun Guo; Yuki Kamiya; Maxim Mai; Ulf-G. Meißner

doi:10.1016/j.physletb.2023.138264

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arXiv · 2308.07658

New insights into the nature of the $\Lambda(1380)$ and $\Lambda(1405)$ resonances away from the SU(3) limit

Feng-Kun Guo·Yuki Kamiya·Maxim Mai·Ulf-G. Meißner

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Abstract

Starting from the SU(3) limit, we consider the nature of the dynamically generated resonances $\Lambda(1380)$, $\Lambda(1405)$ and $\Lambda(1680)$ as the pion and kaon masses are tuned to their physical values. We show that the accidental symmetry of the two octets due to the leading order Weinberg-Tomozawa term is broken by the next-to-leading order terms. Most interestingly, we observe an interchange of the two trajectories of the $\Lambda(1380)$ and the $\Lambda(1405)$ away from the SU(3) limit at next-to-leading order. This remarkable phenomenon can be investigated using lattice QCD calculations that start from the SU(3) limit.

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Feng-Kun Guo, Yuki Kamiya, Maxim Mai, Ulf-G. Meißner. 2023-08-15. New insights into the nature of the $\Lambda(1380)$ and $\Lambda(1405)$ resonances away from the SU(3) limit. https://doi.org/10.1016/j.physletb.2023.138264

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