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arXiv · 2405.14235

Explore the properties of $\Lambda(1670)$ in the Cabibbo-favored process $\Lambda^+_c \to p K^- \pi^+$ decay

Sheng-Chao Zhang·Man-Yu Duan·Wen-Tao Lyu·Guan-Ying Wang·Jing-Yu Zhu·En Wang
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Abstract

Recently, the Belle and LHCb Collaborations have measured the $\Lambda^+_c \to p K^- \pi^+$ decay and reported the $p K^-$ invariant mass distribution, which shows a clear cusp structure around the $\eta \Lambda$ threshold. In this work, we have analyzed this process by considering the triangle mechanism and the $S$-wave pseudoscalar meson-octet baryon interactions within the chiral unitary approach, which dynamically generate the $\Lambda(1670)$. Our results are in good agreement with the Belle measurements, which implies that the cusp structure around $\eta\Lambda$ threshold could be associated with the $\Lambda(1670)$ with the molecular nature.

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Sheng-Chao Zhang, Man-Yu Duan, Wen-Tao Lyu, Guan-Ying Wang, Jing-Yu Zhu, En Wang. 2024-05-23. Explore the properties of $\Lambda(1670)$ in the Cabibbo-favored process $\Lambda^+_c \to p K^- \pi^+$ decay. https://arxiv.org/abs/2405.14235

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