Discriminating baryonium and final-state-interaction interpretations of X(2356)
Abstract
We revisit the X(2356) enhancement observed by BESIII in e+e-→ΛΛ̅η from the viewpoint of near-threshold dynamics. Motivated by the possibility of light ΛΛ̅ baryonium, we compare this interpretation with final-state-interaction (FSI) explanations within a minimal FSI-dressed pole framework. Fits of the pure-FSI, baryonium-like-pole, and mixed pole--continuum scenarios to the digitized BESIII spectrum identify the energy-dependent FSI description as providing the best balance between fit quality and model complexity. The extracted pole positions depend strongly on the amplitude parametrization, demonstrating the sensitivity of the baryonium interpretation to the treatment of the continuum. We discuss how decay channels, spin observables, and partner searches can provide complementary constraints on the dynamics underlying the enhancement.
Related
- Boosted or Inelastic? Discriminating Interpretations of the LZ 248 keV Event
- When hadrons collide: di-J/psi structure in the final state
- The ψ(2S) state as a subthreshold pole in electron positron annihilation into DD̅ final states
- Logarithmically-accurate final-state showers with massive quarks
- The decay ηc→ pp̅η with meson--baryon final-state interactions
BibTeX
@misc{wan2026discriminating,
title = {{Discriminating baryonium and final-state-interaction interpretations of $X(2356)$}},
author = {Bing-Dong Wan and Sheng-Qi Zhang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.21557},
eprint = {2609.21557},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.21557},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Discriminating baryonium and final-state-interaction interpretations of X(2356)
AU - Bing-Dong Wan
AU - Sheng-Qi Zhang
PY - 2026
DA - 2026/09/18
PB - arXiv
DO - 10.48550/arxiv.2609.21557
UR - https://arxiv.org/abs/2609.21557
AB - We revisit the X(2356) enhancement observed by BESIII in e^+e^-→ΛΛ̅η from the viewpoint of near-threshold dynamics. Motivated by the possibility of light ΛΛ̅ baryonium, we compare this interpretation with final-state-interaction (FSI) explanations within a minimal FSI-dressed pole framework. Fits of the pure-FSI, baryonium-like-pole, and mixed pole--continuum scenarios to the digitized BESIII spectrum identify the energy-dependent FSI description as providing the best balance between fit quality and model complexity. The extracted pole positions depend strongly on the amplitude parametrization, demonstrating the sensitivity of the baryonium interpretation to the treatment of the continuum. We discuss how decay channels, spin observables, and partner searches can provide complementary constraints on the dynamics underlying the enhancement.
ER -