Dynamical resonances Λ(1405), Λ(1670), and f0(980) in the process Λc+ → p K+ K-
Abstract
Motivated by new BESIII measurements of the singly Cabibbo-suppressed process $Λ_c^+ \to p K^+ K^- $, we investigate the Λc+ → p K+ K- reaction by taking into account contributions from the low-lying excited baryons Λ(1405) and Λ(1670), which are dynamically generated via the S-wave pseudoscalar meson-octet baryon interaction. In addition, contributions from the light scalar mesons f0(980)/a0(980) dynamically generated via the S-wave pseudoscalar meson-pseudoscalar meson interaction, as well as the vector meson ϕ(1020), are also considered. The theoretical calculations could reproduce the invariant mass distributions of K- p and K+K- measured by the BESIII Collaboration well. Specifically, a near-threshold enhancement and a cusp structure around 1670~MeV in the pK- invariant mass spectrum are obtained, which are associated with the Λ(1405) and Λ(1670) resonances, respectively. Furthermore, contributions from the scalar meson f0(980) and vector meson ϕ(1020) are clearly observed in the K+ K- invariant mass distribution. Future high-precision measurements by the BESIII, Belle II, and the proposed Super Tau-Charm Facility experiments will substantially deepen our understanding of the intrinsic properties of the low-lying excited Λ states and the f0(980)/a0(980) meson.
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BibTeX
@misc{zhang2026dynamical,
title = {{Dynamical resonances $Λ(1405)$, $Λ(1670)$, and $f_0(980)$ in the process $Λ_c^+ \to p K^+ K^-$}},
author = {Sheng-Chao Zhang and Gui-Ye Guo and Guan-Ying Wang and Li-Sheng Geng and En Wang and Ju-Jun Xie},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.24939},
eprint = {2610.24939},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.24939},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Dynamical resonances Λ(1405), Λ(1670), and f_0(980) in the process Λ_c^+ → p K^+ K^-
AU - Sheng-Chao Zhang
AU - Gui-Ye Guo
AU - Guan-Ying Wang
AU - Li-Sheng Geng
AU - En Wang
AU - Ju-Jun Xie
PY - 2026
DA - 2026/10/18
PB - arXiv
DO - 10.48550/arxiv.2610.24939
UR - https://arxiv.org/abs/2610.24939
AB - Motivated by new BESIII measurements of the singly Cabibbo-suppressed process $Λ_c^+ \to p K^+ K^- $, we investigate the Λ_c^+ → p K^+ K^- reaction by taking into account contributions from the low-lying excited baryons Λ(1405) and Λ(1670), which are dynamically generated via the S-wave pseudoscalar meson-octet baryon interaction. In addition, contributions from the light scalar mesons f_0(980)/a_0(980) dynamically generated via the S-wave pseudoscalar meson-pseudoscalar meson interaction, as well as the vector meson ϕ(1020), are also considered. The theoretical calculations could reproduce the invariant mass distributions of K^- p and K^+K^- measured by the BESIII Collaboration well. Specifically, a near-threshold enhancement and a cusp structure around 1670~MeV in the pK^- invariant mass spectrum are obtained, which are associated with the Λ(1405) and Λ(1670) resonances, respectively. Furthermore, contributions from the scalar meson f_0(980) and vector meson ϕ(1020) are clearly observed in the K^+ K^- invariant mass distribution. Future high-precision measurements by the BESIII, Belle II, and the proposed Super Tau-Charm Facility experiments will substantially deepen our understanding of the intrinsic properties of the low-lying excited Λ states and the f_0(980)/a_0(980) meson.
ER -