Common origin of the Belle-BESIII line-shape difference of Λc+Λ̅c-, Ds Ds1 and Ds Ds2* from e+ e- annihilation
Abstract
The longstanding Belle--BESIII discrepancies in the e+e-→Λc+Λ̅c-, DsDs1(2536), and DsDs2*(2573) line shapes remain an unresolved puzzle, with enhancements observed by Belle that are absent or much weaker in the BESIII measurements. In this work, we propose a new mechanism based on the radiative production of higher charmonia to explain these differences. Such processes may contribute to Belle's initial-state radiation samples, and the luminosity normalization increases their contribution to the extracted cross sections. With the vector contributions scaled by BESIII data, a pseudoscalar charmonium ηc(6S) contribution can describe the baryonic enhancement, while an introduced χc2(5P) contribution can describe the enhancements in both meson channels. This mechanism offers a possible common explanation for these differences and, as a bonus, suggests a way to search for missing higher charmonia at Belle II.
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BibTeX
@misc{liu2026common,
title = {{Common origin of the Belle-BESIII line-shape difference of $Λ_c^+\barΛ_c^-$, $D_s D_s1$ and $D_s D_s2^*$ from $e^+ e^-$ annihilation}},
author = {Cheng-Xi Liu and Tian-Le Gao and Cheng-Ping Shen and Xiang Liu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.24634},
eprint = {2610.24634},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.24634},
note = {CC0},
}
RIS
TY - UNPB
TI - Common origin of the Belle-BESIII line-shape difference of Λ_c^+Λ̅_c^-, D_s D_s1 and D_s D_s2^* from e^+ e^- annihilation
AU - Cheng-Xi Liu
AU - Tian-Le Gao
AU - Cheng-Ping Shen
AU - Xiang Liu
PY - 2026
DA - 2026/10/17
PB - arXiv
DO - 10.48550/arxiv.2610.24634
UR - https://arxiv.org/abs/2610.24634
AB - The longstanding Belle--BESIII discrepancies in the e^+e^-→Λ_c^+Λ̅_c^-, D_sD_s1(2536), and D_sD_s2^*(2573) line shapes remain an unresolved puzzle, with enhancements observed by Belle that are absent or much weaker in the BESIII measurements. In this work, we propose a new mechanism based on the radiative production of higher charmonia to explain these differences. Such processes may contribute to Belle's initial-state radiation samples, and the luminosity normalization increases their contribution to the extracted cross sections. With the vector contributions scaled by BESIII data, a pseudoscalar charmonium η_c(6S) contribution can describe the baryonic enhancement, while an introduced χ_c2(5P) contribution can describe the enhancements in both meson channels. This mechanism offers a possible common explanation for these differences and, as a bonus, suggests a way to search for missing higher charmonia at Belle II.
ER -