PreprintCC BY 4.0arXiv
The ψ(2S) state as a subthreshold pole in electron positron annihilation into DD̅ final states
Abstract
By performing a fit to the merged BES 2008 and BESIII 2024 e+e-→ DD̅ cross-section data, we find that the ψ(2S) subthreshold pole influences this process markedly. The statistical significance of the ψ(2S) as a subthreshold pole is 8σ. A fit assuming it and seven resonances excels with the fit quality characterized by χ2/DOF=240.4/284, which means a p-value of 97\%. The interference of resonances with the continuum provided by the subthreshold pole changes their shapes, positions, and widths.
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BibTeX
@misc{lichard2026ψ2s,
title = {{The $ψ$(2S) state as a subthreshold pole in electron positron annihilation into $D\bar D$ final states}},
author = {Peter Lichard},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.37760},
eprint = {2609.37760},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.37760},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - The ψ(2S) state as a subthreshold pole in electron positron annihilation into DD̅ final states
AU - Peter Lichard
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2609.37760
UR - https://arxiv.org/abs/2609.37760
AB - By performing a fit to the merged BES 2008 and BESIII 2024 e^+e^-→ DD̅ cross-section data, we find that the ψ(2S) subthreshold pole influences this process markedly. The statistical significance of the ψ(2S) as a subthreshold pole is 8σ. A fit assuming it and seven resonances excels with the fit quality characterized by χ^2/DOF=240.4/284, which means a p-value of 97\%. The interference of resonances with the continuum provided by the subthreshold pole changes their shapes, positions, and widths.
ER -