Meson-baryon final-state interactions in the ψ(3686)→ pK-KS0Ξ̅0 decay
Abstract
We study the decay ψ(3686)→ p K- K̅0 Ξ̅0, treating the ψ(3686) as a cc̅ state and therefore as a singlet under SU(3) transformations in the light-quark sector. We consider all possible combinations of a baryon, an antibaryon, and two pseudoscalar mesons that form an SU(3) singlet, retaining the terms that can lead to the p K- K̅0 Ξ̅0 final state through S-wave final-state interactions. Three independent SU(3)-singlet structures are identified and assigned different weights. We also include the contribution of the Λ(1520) in the meson-baryon D-wave. A fit to the data provides a good description of all six invariant-mass distributions. In addition to the Λ(1520) contribution, we find a small contribution from the Λ(1670) in the K-p invariant-mass distribution, generated by final-state interactions, and a contribution from the Σ(1430), which produces a significant distortion of the K̅0p invariant-mass distribution relative to phase space. This study demonstrates the value of investigating charmonium decays into a baryon-antibaryon pair and two pseudoscalar mesons, complementing the more commonly studied decays into a baryon-antibaryon pair and a single pseudoscalar meson.
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BibTeX
@misc{sobrinho2026mesonbaryon,
title = {{Meson-baryon final-state interactions in the $ψ(3686)\to pK^-K_S^0\barΞ^0$ decay}},
author = {F. C. Sobrinho and W. -T. Lyu and E. Oset},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.37922},
eprint = {2610.37922},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.37922},
}
RIS
TY - UNPB
TI - Meson-baryon final-state interactions in the ψ(3686)→ pK^-K_S^0Ξ̅^0 decay
AU - F. C. Sobrinho
AU - W. -T. Lyu
AU - E. Oset
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2610.37922
UR - https://arxiv.org/abs/2610.37922
AB - We study the decay ψ(3686)→ p K^- K̅^0 Ξ̅^0, treating the ψ(3686) as a cc̅ state and therefore as a singlet under SU(3) transformations in the light-quark sector. We consider all possible combinations of a baryon, an antibaryon, and two pseudoscalar mesons that form an SU(3) singlet, retaining the terms that can lead to the p K^- K̅^0 Ξ̅^0 final state through S-wave final-state interactions. Three independent SU(3)-singlet structures are identified and assigned different weights. We also include the contribution of the Λ(1520) in the meson-baryon D-wave. A fit to the data provides a good description of all six invariant-mass distributions. In addition to the Λ(1520) contribution, we find a small contribution from the Λ(1670) in the K^-p invariant-mass distribution, generated by final-state interactions, and a contribution from the Σ(1430), which produces a significant distortion of the K̅^0p invariant-mass distribution relative to phase space. This study demonstrates the value of investigating charmonium decays into a baryon-antibaryon pair and two pseudoscalar mesons, complementing the more commonly studied decays into a baryon-antibaryon pair and a single pseudoscalar meson.
ER -