在Belle上$e^{+}e^{-}$湮灭中$J/\psi+\eta_c$的包含产生
Inclusive productions of $J/ψ+η_c$ in $e^{+}e^{-}$ annihilation at Belle
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中文总结 AI 辅助
在NRQCD框架下计算$e^+e^-\to J/\psi+\eta_c+X$的NLO QCD修正,发现色八重态机制在$\Upsilon(4S)$处使截面增加20%-30%且随能量增大,为NRQCD提供灵敏检验,并有望在Belle上观测到。
中文摘要 AI 辅助
我们在非相对论QCD(NRQCD)框架内,在$\alpha_s$的次领头阶(NLO)研究$e^{+}e^{-} \to J/\psi+\eta_c+X$,以评估低能下的色八重态(CO)机制。QCD修正显著增强色单态(CS)和CO领头阶结果,其中QED图对CS道的贡献不可忽略。在$\Upsilon(4S)$处,CO项使包含截面增加$20\\%$--$30\\%$,且该增强随$\sqrt{s}$迅速增大,产生的能量依赖性与CS预言不同,为NRQCD提供了灵敏检验。计入$\psi(2S)$馈入效应后,NRQCD预言在$\Upsilon(4S)$处进一步增大约$40\\%$。利用Belle对$J/\psi \to \mu^+\mu^-$和六个$\eta_c$衰变道的重建,该过程显示出有希望的观测潜力。
英文摘要
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. 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.
发表机构
- School of Physics and Mechatronics Engineering, Guizhou Minzu University(贵州民族大学物理与机电工程学院)
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