Recently, the Belle and LHCb Collaborations have measured the Λc+→pK−π+ decay and reported the pK− invariant mass distribution, which shows a clear cusp structure around the ηΛ 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 Λ(1670). Our results are in good agreement with the Belle measurements, which implies that the cusp structure around ηΛ threshold could be associated with the Λ(1670) with the molecular nature.
@article{arxiv.2405.14235,
title = {Explore the properties of $\Lambda(1670)$ in the Cabibbo-favored process $\Lambda^+_c \to p K^- \pi^+$ decay},
author = {Sheng-Chao Zhang and Man-Yu Duan and Wen-Tao Lyu and Guan-Ying Wang and Jing-Yu Zhu and En Wang},
journal= {arXiv preprint arXiv:2405.14235},
year = {2024}
}