PreprintCC BY 4.0arXiv
Inclusive productions of J/ψ+ηc in e+e− annihilation at Belle
Abstract
We study e+e− → J/ψ+ηc+X at next-to-leading order (NLO) in αs within the nonrelativistic QCD (NRQCD) framework to assess the color-octet (CO) mechanism at low energies. QCD corrections significantly enhance both color-singlet (CS) and CO leading-order results, with non-negligible QED-diagram contributions to the CS channel. At Υ(4S), CO terms increase the inclusive cross section by 20%--30%, and the enhancement grows rapidly with √s, yielding an energy dependence distinct from CS predictions and providing a sensitive test of NRQCD. Including ψ(2S) feed-down further amplifies the NRQCD prediction by about 40% at Υ(4S). With Belle's reconstruction of J/ψ→ μ+μ- and six ηc decay channels, the process shows promising potential for observation.
Related
- Common origin of the Belle-BESIII line-shape difference of Λc+Λ̅c-, Ds Ds1 and Ds Ds2* from e+ e- annihilation
- Inclusive weak decays of the J/ψ: single-charm decay and weak annihilation
- Pc(4312), Pc(4440), and Pc(4457) productions in e+ e− collisions
- Tau and dark sector searches at Belle and Belle II
- Measurements of C P violation with charm hadrons at Belle and Belle II
BibTeX
@misc{sun2026inclusive,
title = {{Inclusive productions of $J/ψ+η_c$ in $e^+e^-$ annihilation at Belle}},
author = {Zhan Sun and Shu-Jian Qi and Ying-Zhao Jiang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.09590},
eprint = {2609.09590},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.09590},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Inclusive productions of J/ψ+η_c in e^+e^− annihilation at Belle
AU - Zhan Sun
AU - Shu-Jian Qi
AU - Ying-Zhao Jiang
PY - 2026
DA - 2026/09/09
PB - arXiv
DO - 10.48550/arxiv.2609.09590
UR - https://arxiv.org/abs/2609.09590
AB - We study e^+e^− → J/ψ+η_c+X at next-to-leading order (NLO) in α_s within the nonrelativistic QCD (NRQCD) framework to assess the color-octet (CO) mechanism at low energies. QCD corrections significantly enhance both color-singlet (CS) and CO leading-order results, with non-negligible QED-diagram contributions to the CS channel. At Υ(4S), CO terms increase the inclusive cross section by 20%--30%, and the enhancement grows rapidly with √s, yielding an energy dependence distinct from CS predictions and providing a sensitive test of NRQCD. Including ψ(2S) feed-down further amplifies the NRQCD prediction by about 40% at Υ(4S). With Belle's reconstruction of J/ψ→ μ^+μ^- and six η_c decay channels, the process shows promising potential for observation.
ER -