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The decay ηc→ pp̅η with meson--baryon final-state interactions
Abstract
We study the decay ηc→ pp̅η by combining the SU(3) flavor structure of the primary production with final-state interactions in the pη and p̅η subsystems, using the chiral unitary approach. The low-energy S11 dynamics, including the dynamically generated N*(1535), is incorporated into the complete coupled-channel amplitude, and a phenomenological N*(1895) contribution is included coherently. The pη and p̅η invariant-mass distributions are well described, and the pp̅ distribution is predicted as a kinematic reflection of the ηN dynamics. The results support the dynamical interpretation of the N*(1535) and suggest possible additional S11 strength near 1.9~GeV.
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BibTeX
@misc{song2026decay,
title = {{The decay $η_c\to p\bar pη$ with meson--baryon final-state interactions}},
author = {Jing Song and Yu-Shan Ren and Eulogio Oset},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.05209},
eprint = {2610.05209},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.05209},
}
RIS
TY - UNPB
TI - The decay η_c→ pp̅η with meson--baryon final-state interactions
AU - Jing Song
AU - Yu-Shan Ren
AU - Eulogio Oset
PY - 2026
DA - 2026/10/04
PB - arXiv
DO - 10.48550/arxiv.2610.05209
UR - https://arxiv.org/abs/2610.05209
AB - We study the decay η_c→ pp̅η by combining the SU(3) flavor structure of the primary production with final-state interactions in the pη and p̅η subsystems, using the chiral unitary approach. The low-energy S_11 dynamics, including the dynamically generated N^*(1535), is incorporated into the complete coupled-channel amplitude, and a phenomenological N^*(1895) contribution is included coherently. The pη and p̅η invariant-mass distributions are well described, and the pp̅ distribution is predicted as a kinematic reflection of the ηN dynamics. The results support the dynamical interpretation of the N^*(1535) and suggest possible additional S_11 strength near 1.9~GeV.
ER -