Year: 2026
Type: preprint
Abstract: We study $e^{+}e^{-} \to J/ψ+η_c+X$ 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 $\sqrt{s}$, yielding an energy dependence distinct from CS predictions and providing a sensitive test of NRQCD. For the central LDME choice, including $ψ(2S)$ feed-down further amplifies the NRQCD prediction by about $40\%$ at $Υ(4S)$. With Belle's reconstruction of $J/ψ\to μ^+μ^-$ and six $η_c$ decay channels, the process shows promising potential for observation.
Source: arXiv (Cornell University)
Authors: Sun, Zhan, Qi, Shu-Jian, Jiang, Ying-Zhao
Institution: Guizhou Minzu University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Award: 对Z玻色子衰变产生重夸克偶素相关过程的精确研究
OpenAlex ID: W7212106804